Article
Energy & Fuels
Janne Puustinen, Joonas Hilska, Arto Aho, Esperanza Luna, Antti Fihlman, Mircea Guina
Summary: The development of low bandgap GaAsNBi solar cells grown using MBE is reported, and the As/Ga flux ratio is found to play an important role in controlling the solar cell performance.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Chemistry, Multidisciplinary
Qi Chen, Kailai Yang, Bo Shi, Xiaoyan Yi, Junxi Wang, Jinmin Li, Zhiqiang Liu
Summary: Beyond traditional heteroepitaxy, 2D-materials-assisted epitaxy opens opportunities to revolutionize future material integration methods. However, basic principles in 2D-material-assisted nitrides' epitaxy remain unclear, which impedes understanding the essence, thus hindering its progress. Here, the crystallographic information of nitrides/2D material interface is theoretically established, which is further confirmed experimentally. It is found that the atomic interaction at the nitrides/2D material interface is related to the nature of underlying substrates. For single-crystalline substrates, the heterointerface behaves like a covalent one and the epilayer inherits the substrate's lattice. Meanwhile, for amorphous substrates, the heterointerface tends to be a van der Waals one and strongly relies on the properties of 2D materials. Therefore, modulated by graphene, the nitrides' epilayer is polycrystalline. In contrast, single-crystalline GaN films are successfully achieved on WS2. These results provide a suitable growth-front construction strategy for high-quality 2D-material-assisted nitrides' epitaxy. It also opens a pathway toward various semiconductors heterointegration.
ADVANCED MATERIALS
(2023)
Article
Energy & Fuels
Arto Aho, Riku Isoaho, Marianna Raappana, Timo Aho, Elina Anttola, Jari Lyytikainen, Arttu Hietalahti, Ville Polojarvi, Antti Tukiainen, Jarno Reuna, Leo Peltomaa, Mircea Guina
Summary: This article discusses the progress in developing lattice-matched GaAs-based solar cells with a focus on expanding the spectral coverage range, by assessing the performance of a four-junction solar cell to explore possibilities for further efficiency improvements, and demonstrating the integration of materials like AlGaInP and GaInNAsSb to achieve higher efficiencies in solar cells.
PROGRESS IN PHOTOVOLTAICS
(2021)
Article
Energy & Fuels
Riku Isoaho, Antti Tukiainen, Juuso Puutio, Arttu Hietalahti, Jarno Reuna, Antti Fihlman, Elina Anttola, Miika Keranen, Arto Aho, Mircea Guina
Summary: This study reports a comprehensive optimization process for GaInNAsSb solar cells grown by molecular beam epitaxy. The results show that the quantum efficiency and current generation of narrow gap materials can be significantly improved by increasing the growth temperature and reducing the As/III beam equivalent pressure ratio. It is also found that increasing the Sb flux can improve the material quality and inhibit phase separation.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Energy & Fuels
Riku Isoaho, Timo Aho, Arto Aho, Antti Tukiainen, Jarno Reuna, Marianna Raappana, Mircea Guina
Summary: Low-bandgap GaInNAsSb single junction solar cells with a planar Au back surface reflector exhibit high short-circuit current density and external quantum efficiency, showing potential for future applications in multijunction solar cells.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Crystallography
Ana Bengoechea-Encabo, Steven Albert, Michael Niehle, Achim Trampert, Enrique Calleja
Summary: Two different arrays of GaN nanocolumns with different average diameters were selectively grown on GaN-buffered Si(0 0 1) substrates. The footprint of the nanocolumns plays an important role in the crystalline quality, despite the low quality of the GaN buffer layer. These results are significant for the integration of GaN-based nano-devices with conventional Si(0 0 1) electronics platform.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Chemistry, Physical
Henryk Turski, Pawel Wolny, Mikolaj Chlipala, Marta Sawicka, Anna Reszka, Pawel Kempisty, Leszek Konczewicz, Grzegorz Muziol, Marcin Siekacz, Czeslaw Skierbiszewski
Summary: Atomically thin metal adlayers are used as surfactants in semiconductor crystal growth, with the role of the adlayer in dopant incorporation in GaN being unexplored. Experimental study shows that the presence of atomically thin gallium or indium layers dramatically affects Ge incorporation in GaN, with indium surfactant layer promoting Ge incorporation while gallium surfactant layer promotes segregation of Ge to the surface. Understanding the role of surfactants is crucial for controlling GaN doping and achieving high n-type doping levels using Ge.
Article
Materials Science, Ceramics
Youngho Kang
Summary: Using density functional theory calculations, we propose antiperovskite nitrides Sr3MN and Ba3MN as potential Pb-free PV absorbers for thin-film solar cells. These compounds have suitable direct bandgaps and high absorption coefficients for PV applications. Analysis of efficiency and carrier diffusion paths supports their viability as high-performance solar cell materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Boya Zhang, Justin C. Bonner, Weijie Xu, Robert T. Piper, Lakshmi N. S. Murthy, Julia W. P. Hsu
Summary: This study compares the photocurrent generation in dilute donor organic solar cells (DDOSCs) based on fullerene and non-fullerene acceptors. The results show that keeping the donor concentration low can avoid the formation of a percolation pathway for hole transport. The use of non-fullerene acceptors improves both charge generation and transport, with charge transport being more important in determining Jsc in DDOSCs.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
I Ohkubo, Z. Hou, J. N. Lee, T. Aizawa, M. Lippmaa, T. Chikyow, K. Tsuda, T. Mori
Summary: The closed-loop optimization of epitaxial titanium nitride thin-film growth was achieved using metal-organic molecular beam epitaxy (MO-MBE) technique combined with Bayesian machine learning, reducing the number of growth experiments. Epitaxial TiN thin films grown under the optimized conditions exhibited abrupt superconductor transitions above 5 K, showing a new efficient approach for developing less-studied materials. The combination of thin-film growth technique and Bayesian approach is expected to accelerate the development of automated operation of thin-film growth apparatuses.
MATERIALS TODAY PHYSICS
(2021)
Article
Energy & Fuels
Johanna Aulich, David Chojniak, Alexander J. Bett, Marc Steiner, Florian Schindler, Gerald Siefer, Martin C. Schubert, Jan Christoph Goldschmidt, Stefan W. Glunz
Summary: Spectrometric characterization is a method for accurately determining the current matching point and investigating sub-cell properties of multi-junction solar cells. This paper presents the applicability and evaluation procedure for a systematic variation of all three sub-cells of a triple-junction solar cell. Clearly defined measurement conditions are derived to allow meaningful characterization and comparisons of different devices.
Article
Energy & Fuels
T. Paulauskas, V Pacebutas, A. Geizutis, M. Kamarauskas, M. Drazdys, M. Rudzikas, R. Kondrotas, A. Naujokaitis, I Nevinskas, B. Sebeka, V Strazdiene, A. Krotkus
Summary: This study analyzes the potential of dilute GaAsBi as a subcell in III-V multijunction solar cells and proposes methods to improve performance by optimizing layer thickness and doping concentration.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Physics, Multidisciplinary
Xiang-Peng Zhou, Hai-Bing Qiu, Wen-Xian Yang, Shu-Long Lu, Xue Zhang, Shan Jin, Xue-Fei Li, Li-Feng Bian, Hua Qin
Summary: AlN/GaN resonant tunneling diodes (RTDs) grown on freestanding GaN substrates exhibit room temperature negative differential resistance (NDR) and two resonance peaks, with lower dislocation densities, flatter surface morphology, and steeper heterogeneous interfaces being key factors for achieving NDR.
Article
Multidisciplinary Sciences
Zhenrong Jia, Shucheng Qin, Lei Meng, Qing Ma, Indunil Angunawela, Jinyuan Zhang, Xiaojun Li, Yakun He, Wenbin Lai, Ning Li, Harald Ade, Christoph J. Brabec, Yongfang Li
Summary: The study demonstrates a simple strategy of extending the conjugation length of acceptor Y6 to synthesize a new narrow bandgap acceptor BTPV-4F, which shows great potential in tandem organic solar cells. By using BTPV-4F in the rear cell, tandem devices achieved a high power conversion efficiency of over 16.4% with good photostability, addressing previous limitations in near-infrared absorbing materials for tandem organic solar cells.
NATURE COMMUNICATIONS
(2021)
Article
Energy & Fuels
Hao Qiu, Haoran Xu, Gang Xiao
Summary: Photon-enhanced thermionic emission (PETE) converter is a solid-state heat engine that reduces the electron emission barrier using photo-induced quasi-Fermi level splitting. This study proposes a concept of a hybrid PETE-PV solar cell that utilizes penetrating solar photons to increase output power. Simulation and experimental results demonstrate the superior performance of the PETE-PV solar cell.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Physics, Applied
Masoud Ebrahimzadeh, Sami Vuori, Mikko Miettinen, Juha-Pekka Lehtio, Sari Granroth, Marko P. J. Punkkinen, Zahra Sadat Jahanshah Rad, Risto Punkkinen, Mikhail Kuzmin, Pekka Laukkanen, Mika Lastusaari, Kalevi Kokko
Summary: Properties of oxidized InP surfaces are important for developing passivation of III-V crystals. Exposure to NH3 or O-2 gas at low temperatures can modify InP native oxides. NH3 exposure increases photoluminescence intensity for n-InP crystals with native oxide, while O-2 exposure increases it for p-type InP crystals.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Optics
S. C. Burd, J. -P. Penttinen, P. -Y. Hou, H. M. Knaack, S. Ranta, M. Maki, E. Kantola, M. Guina, D. H. Slichter, D. Leibfried, A. C. Wilson
Summary: This article presents two systems based on vertical-external-cavity surface-emitting lasers (VECSELs) that can generate ultraviolet laser light at 235 and 313 nm wavelengths, suitable for quantum information processing with trapped beryllium ions. Each system includes a compact, single-frequency, continuous-wave VECSEL that produces high-power near-infrared light and can be tuned over tens of nanometers. One system produces 2.4 W of power at 940 nm, which is converted to 54 mW of 235 nm light for photoionization of neutral beryllium atoms. The other system uses a gain mirror based on GaInNAs/GaAs quantum wells, extending the wavelength above 1200 nm with manageable strain in the GaAs lattice, and generates 1.6 W at 1252 nm, which is converted to 41 mW of 313 nm light for laser cooling of trapped 9Be+ ions and quantum state preparation and detection. The 313 nm system is also suitable for implementing high-fidelity quantum gates.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Omer Donmez, Mustafa Aydin, Selman Mutlu, Janne Puustinen, Joonas Hilska, Mircea Guina, Ayse Erol
Summary: We present experimental and analytical results on hot electron transport in as-grown and annealed n-type modulation-doped Al0.15Ga0.85As/GaAs0.96Bi0.4 quantum well structures. The drift mobility and velocity of the annealed sample are lower due to the increased 2D electron density caused by annealing. Hot electron transport occurs in parallel mode, and inter-valley transfer dominates at higher electric fields.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Optics
Nouman Zia, Samu-pekka Ojanen, Jukka Viheriala, Eero Koivusalo, Joonas Hilska, Heidi Tuorila, Mircea Guina
Summary: This paper presents a hybrid laser that combines GaSb-based semiconductor gain chips with Si3N4 photonic integrated circuits. The low-loss features of Si3N4 waveguides are utilized to integrate a tunable Si3N4 Vernier mirror. The laser exhibits a maximum output power of 15 mW and a tuning range of about 90 nm at room temperature. The low-loss performance of various Si3N4 building blocks for photonic integrated circuits is also confirmed.
Article
Energy & Fuels
Andrea Scaccabarozzi, Stefano Vichi, Sergio Bietti, Federico Cesura, Timo Aho, Mircea Guina, Federica Cappelluti, Maurizio Acciarri, Stefano Sanguinetti
Summary: We investigate the impact of quantum dot aspect ratio on the sub-gap absorption properties of GaAs/AlGaAs quantum dot intermediate band solar cells. Using droplet epitaxy, we grow AlGaAs solar cells with GaAs quantum dots, which allows for strain-free nanostructures with lattice matched materials. By varying the dot aspect ratio, we can tune the energy levels of the intermediate band, thereby altering the sub-gap absorption spectrum and charge carrier extraction. The tradeoff between thermal and optical extraction is crucial for the proper functioning of the intermediate band solar cells, with the photonic extraction mechanism from the quantum dots becoming dominant at room temperature.
PROGRESS IN PHOTOVOLTAICS
(2023)
Article
Physics, Applied
Hanchen Liu, Toni P. Pasanen, Oskari Leiviska, Joonas Isometsa, Tsun Hang Fung, Marko Yli-Koski, Mikko Miettinen, Pekka Laukkanen, Ville Vahanissi, Hele Savin
Summary: The excellent field-effect passivation provided by aluminum oxide (Al2O3) on germanium surfaces relies on a high negative fixed charge. However, this study investigates the surface passivation performance and charge polarity of plasma-enhanced atomic layer deposited (PEALD) silicon oxide (SiO2) on Ge. The results show that even a 3 nm thick PEALD SiO2 provides a positive charge density and a relatively good surface passivation. Furthermore, adding an ALD Al2O3 layer further improves the surface passivation.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Philipp Tatar-Mathes, Hoy-My Phung, Aaron Rogers, Patrik Rajala, Sanna Rant, Mircea Guina, Hermann Kahle
Summary: This study presents the operation of a semiconductor membrane external-cavity surface-emitting laser (MECSEL) using a gain membrane with a non-resonant cavity design. The MECSEL delivers watt-level output power, comparable to state-of-the-art results. The research shows that the design criteria for the MECSEL gain region can be relaxed compared to designs using distributed Bragg reflectors, minimizing the impact of defective Fabry-Perot micro-cavity effects.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
Samu-Pekka Ojanen, Jukka Viheriala, Nouman Zia, Eero Koivusalo, Joonas Hilska, Heidi Tuorila, Mircea Guina
Summary: Photonic integrated circuits fabricated using a Si3N4 waveguide platform exhibit low losses in a wide wavelength region. A high-performance integrated laser with broad wavelength tunability near a 2.6 μm wavelength region is demonstrated, based on a Si3N4 photonic integrated circuit incorporating a tunable reflector and a AlGaInAsSb/GaSb quantum-well gain element. The platform also supports low propagation loss up to 3.5 μm.
LASER & PHOTONICS REVIEWS
(2023)
Article
Nanoscience & Nanotechnology
Tsun Hang Fung, Joonas Isometsa, Juha-Pekka Lehtio, Toni P. Pasanen, Hanchen Liu, Oskari Leiviska, Pekka Laukkanen, Hele Savin, Ville Vahanissi
Summary: Nanostructured germanium surfaces have achieved >99% absorption in a wide wavelength range, promising high performance for optoelectronic devices. By characterizing the surface and interface properties, we identified the limiting factors for surface recombination velocity of the nanostructures and developed a surface passivation scheme using atomic-layer-deposited aluminum oxide and sequential chemical treatment. With this scheme, we achieved a low surface recombination velocity and 1% reflectance from ultraviolet to near-infrared. We discussed the impact of these results on Ge-based optoelectronic applications.
Article
Optics
D. Mitten, M. Hart, S. H. Warner, J. -P. Penttinen, M. Guina, Y. Kaneda
Summary: A vertical external cavity surface emitting laser (VECSEL) has been developed for a sodium guide star application. Stable single frequency operation with 21 W of output power near 1178 nm with multiple gain elements while lasing in the TEM00 mode has been achieved. This is the first demonstration of a high power single frequency VECSEL using a twisted-mode configuration and multiple gain mirrors located at the cavity folds.
Article
Physics, Applied
Y. Q. Huang, V Polojarvi, A. Aho, R. Isoaho, T. Hakkarainen, M. Guina, I. A. Buyanova, W. M. Chen
Summary: This study demonstrates the existence of nonlinear spin response in nonmagnetic materials and showcases it in a (Ga, N)As-InAs quantum dot coupled all-semiconductor nanostructure. The observed spin nonlinearity can be conveniently tuned with an external magnetic field and potentially operates at a speed exceeding 1 GHz.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Masoud Ebrahimzadeh, Sari Granroth, Sami Vuori, Marko Punkkinen, Mikko Miettinen, Risto Punkkinen, Mikhail Kuzmin, Pekka Laukkanen, Mika Lastusaari, Kalevi Kokko
Summary: Successful reduction of contact resistivity on p-InP crystals was achieved through wet-chemistry treatments and nanoscale control, improving the durability and conductivity of the devices.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Optics
Samu-Pekka Ojanen, Jukka Viheriala, Nouman Zia, Eero Koivusalo, Joonas Hilska, Heidi Tuorila, Mircea Guina
Summary: A discrete, tunable photonic integrated laser is demonstrated for multiwavelength spectroscopy. The laser combines a reflective semiconductor optical amplifier with a photonic integrated circuit, allowing for switching between three distinct emission wavelengths. The design simplifies the tuning mechanism compared to other hybrid lasers.
LASER & PHOTONICS REVIEWS
(2023)
Article
Energy & Fuels
Janne Puustinen, Joonas Hilska, Arto Aho, Esperanza Luna, Antti Fihlman, Mircea Guina
Summary: The development of low bandgap GaAsNBi solar cells grown using MBE is reported, and the As/Ga flux ratio is found to play an important role in controlling the solar cell performance.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Proceedings Paper
Nanoscience & Nanotechnology
Jukka Viheriala, Topi Uusitalo, Heikki Virtanen, Behzad Namvar, Patrik Rajala, Sanna Ranta, Teemu Hakkarainen, Antti Tukiainen, Guilhem Almuneau, Mircea Guina
Summary: This paper presents the development of vertical cavity surface emitting lasers (VCSELs) operating at 4.2K for energy efficient optical links between cryogenic systems and room-temperature data storage systems. The design considerations, material models, and validation of required electro-optical-thermal models are discussed. Successful operation at mA-level injection is demonstrated.
2023 IEEE PHOTONICS SOCIETY SUMMER TOPICALS MEETING SERIES, SUM
(2023)
Article
Energy & Fuels
Shahriyar Safat Dipta, Md Habibur Rahaman, Walia Binte Tarique, Ashraful Hossain Howlader, Ayush Pratik, John A. Stride, Ashraf Uddin
Summary: Implementing a double-sided passivation approach can enhance the performance of n-i-p structured PSCs and improve the stability and photovoltaic properties of the cells.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
Daniel Ourinson, Andreas Brand, Andreas Lorenz, Marwan Dhamrin, Sebastian Tepner, Michael Linse, Nathalie Goettlicher, Kosuke Tsuji, Jonas D. Huyeng, Florian Clement
Summary: This work presents two approaches to reduce the amount of silver on the rear side of M2-sized industrial iTOPCon solar cells. The Cu-based approach shows promise with similar power conversion efficiency compared to the conventional approach, while the Al-based approach exhibits some limitations but demonstrates the potential of such type of contact for iTOPCon solar cells.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
Abasifreke Ebong, Donald Intal, Sandra Huneycutt, Thad Druffel, Ruvini Dharmadasa, Kevin Elmer, Apolo Nambo
Summary: This study demonstrates the successful metallization of a PERC silicon solar cell using screen-printable copper (Cu) paste. The Cu paste contains antioxidant additives and diffusion inhibitors to prevent oxidation and diffusion of Cu. The Cu-printed cells achieved an efficiency of 19% and showed no Cu diffusion after characterization tests. The long-term stability and effectiveness of the Cu diffusion barrier were also confirmed.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
Senami Zogbo, Wilfried Favre, Olivier Bonino, Marie-Estelle Gueunier-Farret
Summary: Measuring specific contact resistivity (pc) is crucial for interface engineering in high efficiency solar cells. The Transfer Length Method (TLM) is commonly used for evaluating layer sheet resistance (Rsheet) and pc, but it is not suitable for metal/Transparent Conductive Oxide (TCO) interface evaluation in silicon heterojunction (SHJ) cells. This study investigates the parameters that restrict current confinement within the TCO, including mid-gap trap density (Dit) at the a-Si:H/c-Si interface and the activation energy (Ea = Ec - EF) variation of a-Si:H contact layers.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
Jean-Baptiste Charpentier, Philippe Voarino, Julien Gaume
Summary: The phenomenon of ribbon lengthening in PV modules exposed to thermal cycling is not well explained in the literature. In this study, a three layers model is proposed to explain this effect, and the predictions of the model are validated through finite element method simulations and experiments. The results show that the model predictions are consistent with the indirect measurements, but not with the direct measurements. Additionally, it is inferred that the encapsulant plays a role after the solder failure.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
Jean-Baptiste Charpentier, Philippe Voarino, Julien Gaume
Summary: This study investigates the problematic ribbon lengthening observed in PV modules exposed to high amplitude thermal cycling. A simplified system model is proposed and accurate predictions are obtained using the Finite Element Method. The results show that the thickness of the encapsulant has a substantial impact on the lengthening of the ribbons.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
S. Catalan-Gomez, E. Martinez Castellano, M. Schwarz, M. Montes Bajo, L. Dorado Vargas, A. Gonzalo, A. Redondo-Cubero, A. Gallego Carro, A. Hierro, J. M. Ulloa
Summary: This study investigates the use of core-shell gallium nanoparticles as functional light scatterers on solar cells. By optimizing the nanoparticle size, the short-circuit current of the solar cells is significantly improved. The underlying physical mechanism is studied through optical measurements and simulations, and a method to reduce the plasmonic effect of the nanoparticles is demonstrated.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
M. Gamel, G. Lopez, A. M. Medrano, A. Jimenez, A. Datas, M. Garin, I. Martin
Summary: In this study, a highly reflective ohmic contact to p-type c-Ge material is demonstrated, which can improve the efficiency of thermophotovoltaic devices. The experimental results show that this contact can simultaneously meet the requirements of good back surface passivation, low electrical resistivity, and high reflectivity. Moreover, simulations suggest that implementing these back contacts has the potential to achieve conversion efficiencies comparable to high-efficiency c-Ge TPV cells.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
Hongyang Wei, Qing Xu, Dongchu Chen, Min Chen, Menglei Chang, Xiufang Ye
Summary: This study prepared solar selective absorption films based on anodic aluminum oxide (AAO) photonic crystals using a unique electrodeposition method. The Co-Ag electrodeposited film exhibited superior solar selective absorption properties and thermal stability.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
Ankit Kumar, Ankit Chauhan, Jordi Llobet, Helder Fonseca, Patricia C. Sousa, Carlos Calaza, Gil Shalev
Summary: This study found that decorating subwavelength arrays with SiO2 quasi-nanolenses (qNL arrays) can enhance the absorption of the solar spectrum. Optical absorption mechanisms in qNL arrays were investigated using near-field scanning optical microscopy (NSOM), revealing that the enhancement is a result of the combination of effective antireflection coating, increased optical interactions between adjacent dielectrics for elevated light trapping, and strong light concentration due to the presence of qNLs.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
S. Pingel, T. Wenzel, N. Goettlicher, M. Linse, L. Folcarelli, J. Schube, S. Hoffmann, S. Tepner, Y. C. Lau, J. Huyeng, A. Lorenz, F. Clement
Summary: This study demonstrates the potential to reduce silver consumption in highly efficient SHJ cells through fine-line screen printing using low temperature paste with various screens. The results show that using finer mesh allows for narrower grid fingers and lower resistance, leading to improved cell efficiency. Simulation results indicate that module wire configuration is crucial for reducing silver consumption.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
Xibo He, Jun Qiu, Wei Wang, Yicheng Hou, Yong Shuai
Summary: This paper proposes a novel phase change material with high thermal conductivity and stability for fast photo-thermal conversion and storage. The experimental results demonstrate excellent durability and stability of the phase change material, with good performance in thermal conductivity and thermal storage efficiency.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
Qingyuan Liu, Lin Wang, Zheng Liu, Guohua Liu
Summary: A new evaporating structure consisting of liquid marble with tunable nanowire array is proposed to enhance solar evaporation. The experiments show that the liquid marble with nanowire array exhibits outstanding evaporation performance, which has significant implications for seawater desalination or wastewater treatment.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
Hao Liu, Qiming Liu, Jinpei Liu, Yonggang Zhao, Yingjie Yu, Yue An, Ganghui Wei, Yanzheng Li, Yujun Fu, Junshuai Li, Deyan He
Summary: Moisture in the air is identified as the main cause of performance degradation in organic-inorganic hybrid solar cells. Exposure to air leads to the growth of thin oxide layer on the interface and the formation of silver sulfide, increasing the series resistance and decreasing the fill factor, thus degrading the cell performance.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Energy & Fuels
E. Blanco, P. Martin, M. Dominguez, P. Fernandez-Palacios, I. Lombardero, C. Sanchez-Perez, I. Garcia, C. Algora, M. Gabas
Summary: This study addresses the lack of optical parameters for p-type Ge wafers by determining the complex refractive indices of commercial Ge wafers with varying doping levels. The obtained data successfully reproduces the critical points associated with interband transitions and absorption features below the bandgap. The refractive indices were validated through experimental measurements and solar cell simulations.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
