Article
Chemistry, Physical
Zhuopeng Wu, Weiyuan Duan, Andreas Lambertz, Depeng Qiu, Manuel Pomaska, Zhirong Yao, Uwe Rau, Liping Zhang, Zhengxin Liu, Kaining Ding
Summary: This study demonstrates the implementation of trimethyl boron doped p-type a-Si:H film as a hole transport layer contacting with indium-free aluminum doped zinc oxide in silicon heterojunction solar cells. The research shows that moderate doping concentration can help achieve low defect density and high doping level in the film, resulting in improved cell performance with low contact resistivity.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Bowen Li, Liang Li, Hui Ren, Yuan Lu, Fangfang Peng, Yuliang Chen, Changlong Hu, Guobin Zhang, Chongwen Zou
Summary: The study presents a novel photoassisted ion-doping method to modulate the phase transition of VO2 layer based on the photovoltaic effect and electron-ion synergic doping; experimental results demonstrate effective doping control of n-VO2 layer and triggering of insulator-metal-insulator transitions.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Yue-Xing Chen, Xiao-Lei Shi, Zhuang-Hao Zheng, Fu Li, Wei-Di Liu, Wen-Yi Chen, Xin-Ru Li, Guang-Xing Liang, Jing-Ting Luo, Ping Fan, Zhi-Gang Chen
Summary: This study introduces p-type two-dimensional WSe2 nanoinclusions into n-type polycrystalline SnSe for the formation of p-n junctions, resulting in enhanced thermoelectric performance through phonon scattering and Fermi level control.
MATERIALS TODAY PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Fangping Wang, Enling Li, Zhen Cui, Pengfei Shen, Hongyuan Zhao, Yang Shen, Deming Ma
Summary: By using density functional theory, we found that the F-GaN-H in the buckled 2D GaN monolayers has the strongest polarity and the most stable structure. Based on its polarization direction and intensity, self-doping heterostructures can be constructed and the doping type and level can be effectively modulated. The resulting p-n junction in the graphene/GaN sandwich structure acts as a natural low-resistance contact.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Jing Zhuang, Peng Mao, Yigang Luan, Ningli Chen, Xiaofei Cao, Guosheng Niu, Feifei Jia, Fuyi Wang, Shaokui Cao, Jizheng Wang
Summary: Regulating the electron transport layer (ETL) using the cost-effective modification material rubidium fluoride (RbF) can enhance the electron mobility of SnO2 and suppress hysteresis in perovskite solar cells (PSCs). Double-sided passivated PSCs with RbF on the SnO2 surface and p-methoxyphenethylammonium iodide on the perovskite surface achieved an outstanding PCE result with a small V-oc deficit.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Jianxing Xia, Ruiling Zhang, Junsheng Luo, Hua Yang, Hongyu Shu, Haseeb Ashraf Malik, Zhongquan Wan, Yu Shi, Keli Han, Ruilin Wang, Xiaojun Yao, Chunyang Jia
Summary: PHC as an efficient and stable single dopant in PSCs demonstrates advantages in hydrophobicity and larger van der Waals radius, leading to improved stability and enhanced efficiency through conversion of deep trap states, interface optimization, and carrier transfer enhancement.
Article
Energy & Fuels
Lewis Ricci, Mao-Feng Tseng, Meng Tao
Summary: A method to repair laser-induced phosphorus loss from the n-type emitter of Si solar cells during light-induced Al plating is demonstrated. The ability to add a water-reactive phosphorus compound, PCl5, into the Al plating bath gives a unique advantage to Al over Cu for front contacts on Si solar cells. The contact resistivity between light induced Al and Si emitter is reduced to as low as 0.1 m omega-cm(2). Cyclic voltammetry performed on a plating bath composed of 81 wt% 1-ethyl-3-methylimidazolium tetrachloroaluminate, 19 wt% AlCl3, and 0.2 wt% PCl(5 )reveals multiple reduction reactions of PCl5, although incomplete decomposition of PCl5 is possible. A decrease in nucleation loop size during cyclic voltammetry is also observed suggesting that PCl5, while being consumed, modifies the growth mechanism during Al plating. Structural analysis confirms that the addition of PCl5 produces an Al film which is levelized and compact. A pulsed voltage profile coupled with chemical analysis verifies that phosphorus incorporation is electrolytically activated and is likely the cause for the low contact resistivity.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Energy & Fuels
P. Saravanan, M. Maheswari, Sondos Abdullah Alqarni
Summary: In this study, n-type Ce3+ doped ZnO nano-structured thin films were successfully fabricated on p-Si wafers using a facile phytochemical assisted hydrothermal technique. The hetero-structure diodes exhibited improved structural, morphological, optical, electrical and photocatalytic properties. The doping of Ce3+ ions resulted in changes in peak position shift, decreased crystalline size, and flake-like morphology. Moreover, the optical bandgap values decreased after cerium ions doping, leading to enhanced diode rectification behavior and increased photocatalytic efficiency in methylene blue dye degradation.
Article
Physics, Multidisciplinary
Xiao You-Peng, Wang Huai-Ping, Li Gang-Long
Summary: In this study, a graphene/Ag2ZnSnSe4 induced p-n junction thin film solar cell is proposed and simulated to analyze the performance influencing factors of the device. The results show that the work function of graphene and back contact significantly affect the carrier separation, transportation, and collection, while the doping concentration and defect density of the Ag2ZnSnSe4 absorber also play a crucial role in determining the device efficiency. By optimizing the work function and properties of the materials, a high-efficiency and low-cost solar cell can be designed.
ACTA PHYSICA SINICA
(2021)
Article
Materials Science, Multidisciplinary
Zeheng Wang, Liang Li
Summary: In commercial applications of gallium nitride (GaN), bipolar devices are in high demand. This work proposes a novel strategy to form lateral bipolar GaN p-n junctions using two-dimensional polarization doping. The theory and simulation show that this strategy has inspiring performance and is highly promising for monolithic heterojunction integration.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
Yue Ma, Qizhen Song, Xiaoyan Yang, Huachao Zai, Guizhou Yuan, Wentao Zhou, Yihua Chen, Fengtao Pei, Jiaqian Kang, Hao Wang, Tinglu Song, Xueyun Wang, Huanping Zhou, Yujing Li, Yang Bai, Qi Chen
Summary: By pre-depositing pyrrolidinium hydroiodide to react with residual PbI2 at the buried interface, we successfully change the band alignment, remove the negative-type impurities, and improve the device efficiency and stability. As a result, the planar p-i-n perovskite solar cells achieve an efficiency of 24.5% and remarkable photostability for 2800 hours, which is among the highest efficiency p-i-n perovskite solar cells fabricated via a two-step process.
Article
Chemistry, Multidisciplinary
Lina Wang, Qizhen Song, Fengtao Pei, Yihua Chen, Jie Dou, Hao Wang, Congbo Shi, Xiao Zhang, Rundong Fan, Wentao Zhou, Zhiwen Qiu, Jiaqian Kang, Xueyun Wang, Andreas Lambertz, Mengru Sun, Xiuxiu Niu, Yue Ma, Cheng Zhu, Huanping Zhou, Jiawang Hong, Yang Bai, Weiyuan Duan, Kaining Ding, Qi Chen
Summary: This research presents a strain modulation strategy to fabricate light-stable perovskite/silicon tandem solar cells. By converting residual tensile strain to compressive strain, the cells achieve a high power conversion efficiency and improved light stability.
ADVANCED MATERIALS
(2022)
Article
Energy & Fuels
Isidora Susic, Kassio P. S. Zanoni, Abhyuday Paliwal, Ismail C. Kaya, Zafer Hawash, Michele Sessolo, Ellen Moons, Henk J. Bolink
Summary: This study investigates the characteristics of thin hole transport layers (HTLs) in vacuum-deposited perovskite solar cells. It is found that only very thin HTLs (<5 nm) result in high-performing devices, while thicker films (>= 5 nm) exhibit dynamic behavior in consecutive electrical measurements. Furthermore, small-molecule HTLs are found to lead to thermally unstable solar cells, possibly due to chemical reactions/diffusion at the interface with the perovskite layer.
Article
Chemistry, Physical
Jin Hyuck Heo, Fei Zhang, Jin Kyoung Park, Hyong Joon Lee, David Sunghwan Lee, Su Jeong Heo, Joseph M. Luther, Joseph J. Berry, Kai Zhu, Sang Hyuk Im
Summary: Surface engineering of the CsPbI3 layer with oxidized Ti3C2Tx MXene nanoplates via spray coatings resulted in highly efficient and stable p-i-n-structured CsPbI3 perovskite solar cells. The addition of OMXene provided a physical barrier against moisture and improved charge separation at the perovskite-electron transporting layer interface, leading to the demonstration of efficient CsPbI3/OMXene-based p-i-n devices with good stability.
Article
Computer Science, Information Systems
Jasurbek Gulomov, Oussama Accouche, Rayimjon Aliev, Raymond Ghandour, Irodakhon Gulomova
Summary: This paper focuses on exploring new materials and structure to enhance the efficiency of solar cells, specifically by studying ZnO/Si and TiO2/Si heterojunction solar cells. The electrical and optical properties of ZnO and TiO2 were determined using different functionals in Density Functional Theory (DFT). It was found that TiO2 can be used as a transparent contact and ZnO as an emitter layer in a silicon-based solar cell.
Article
Materials Science, Multidisciplinary
Apostolos Segkos, Eleni Alexandratou, Ilias Sakellis, Nikolaos Boukos, Spiros Gardelis, Konstantinos Kordatos, Christos Tsamis
Summary: This work investigates the photoluminescence mechanisms of N-doped, CQD-based nanocomposites in the form of aqueous suspensions and thin films, aiming to facilitate their solid-state applications. The study reveals two optical centers, H-aggregates of citrazinic acid derivatives and 4-hydroxy-1H-pyrrolo[3,4-c]pyridine-1,3,6(2H,5H)-trione (HPPT), which are excitation-independent emitters and sensitive to ambient pH conditions. The interaction between these optical centers in the solid state is also observed through an energy transfer mechanism.
FUNCTIONAL MATERIALS LETTERS
(2022)
Article
Chemistry, Physical
Georgios Chatzigiannakis, Angelina Jaros, Renaud Leturcq, Joergen Jungclaus, Tobias Voss, Spiros Gardelis, Maria Kandyla
Summary: An isotype heterojunction n(+)-ZnO/n-Si photodetector has been developed, which can operate in a wavelength-selective or broadband manner depending on the applied bias voltage. At zero bias, it can distinguish between UV, visible, and near IR photons by controlling the polarity of the photocurrent.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
John Theocharis, Spiros Gardelis, George Papaioannou
Summary: This study investigates the impact of ambient on the field emission of rigid MEMS capacitive structure and the resulting breakdown induced damage. The findings include asperities burning due to Joule heating and explosive breakdown, which leads to mirror-like craters on the cathode and anode electrodes. In vacuum, there is a linear relation between crater diameter and breakdown current. However, in ambient atmosphere, breakdown results in large amplitude current oscillations and extended damage on both electrodes.
IEEE TRANSACTIONS ON DEVICE AND MATERIALS RELIABILITY
(2022)
Article
Engineering, Electrical & Electronic
J. Theocharis, S. Gardelis, G. Papaioannou
Summary: This study provides experimental evidence of field emission in MEMS capacitive switches and investigates dielectric layers of silicon nitride with different thicknesses. Although field emission is not always clearly observed, it occurs in all devices and manifests at higher electric fields.
MICROELECTRONICS RELIABILITY
(2022)
Article
Engineering, Electrical & Electronic
E. Hourdakis, I. Kochylas, M. A. Botzakaki, N. J. Xanthopoulos, S. Gardelis
Summary: Metal-Insulator-Semiconductor micro-capacitors fabricated using Si nanowires show potential for on-chip energy storage applications. Copper electrodes were found to be more efficient than aluminum electrodes in reducing parasitic interface oxide and improving capacitor performance. The demonstrated capacitors exhibit high capacitance, low leakage current, and a high cutoff frequency, making them attractive for on-chip energy storage applications.
SOLID-STATE ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Zoi Georgiopoulou, Apostolis Verykios, Kalliopi Ladomenou, Katerina Maskanaki, Georgios Chatzigiannakis, Konstantina-Kalliopi Armadorou, Leonidas C. C. Palilis, Alexander Chroneos, Evangelos K. K. Evangelou, Spiros Gardelis, Abd. Rashid bin Mohd Yusoff, Athanassios G. G. Coutsolelos, Konstantinos Aidinis, Maria Vasilopoulou, Anastasia Soultati
Summary: In this study, carbon nanodots are shown to play a beneficial role as electron transport materials in OLEDs and OSCs. The properties of both pristine and nitrogen-functionalized carbon dots are systematically studied using various techniques to uncover their energetic alignment and interaction with the organic semiconductor's emissive layer. The results reveal significant improvements in the current and luminescent characteristics of the OLED devices, mainly due to a decrease in electron injection barrier. The power conversion efficiency of the OSCs using carbon dots as cathode interfacial layers also increases by nearly 10% compared to the reference device. The use of low-cost solution-processed materials in OLEDs and OSCs has the potential for widespread implementation in large-area applications.
Article
Chemistry, Physical
Maria-Athina Apostolaki, Elias Sakellis, Polychronis Tsipas, Maria Giannouri, Spiros Gardelis, Nikos Boukos, Athanasios Dimoulas, Vlassis Likodimos
Summary: Heterostructured WO3/TiO2 photonic crystal films in the form of three-dimensional macroporous inverse opals were developed by single-step, three-phase co-assembly of colloidal templates with water soluble precursors. The properties of the inverse opals could be controlled by adjusting the W/Ti molar ratio and macropore diameter. This method provides a promising route for the development of heterostructured inverse opal networks with tailored electronic properties and improved solar light harvesting.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Ioannis Kochylas, Anastasios Dimitriou, Maria-Athina Apostolaki, Maria-Christina Skoulikidou, Vlassios Likodimos, Spiros Gardelis, Nikolaos Papanikolaou
Summary: In this study, active substrates consisting of Ag-decorated silicon nanowires on a Si substrate were developed using a single-step Metal Assisted Chemical Etching (MACE) process. Their performance in identifying low concentrations of Rhodamine 6G was evaluated using surface-enhanced photoluminescence spectroscopy. Different structures with Ag-aggregates and Ag-dendrites were fabricated and studied based on the etching parameters. Additionally, the addition of Au nanoparticles on the MACE-treated surfaces significantly enhanced the photoluminescence, with the Ag-dendrites enriched with Au nanoparticles showing a Limit of Detection of Rhodamine 6G down to 10(-12) M.
Review
Chemistry, Physical
Georgia Geka, Anastasia Kanioura, Vlassis Likodimos, Spiros Gardelis, Nikolaos Papanikolaou, Sotirios Kakabakos, Panagiota Petrou
Summary: Early diagnosis and monitoring are crucial for the effective treatment and survival of cancer patients. Immunosensors based on surface-enhanced Raman spectroscopy (SERS) have shown promise in the sensitive detection of cancer biomarkers in biological fluids. This review article focuses on the advancements made in the immunochemical determination of cancer biomarkers using SERS, including both single and multi-analyte detection. The future prospects of SERS immunosensors for cancer marker detection are also discussed.
Article
Chemistry, Analytical
Anastasia Kanioura, Georgia Geka, Ioannis Kochylas, Vlassis Likodimos, Spiros Gardelis, Anastasios Dimitriou, Nikolaos Papanikolaou, Sotirios Kakabakos, Panagiota Petrou
Summary: Glutathione and malondialdehyde are commonly used compounds to evaluate oxidative stress. This study explores the use of surface-enhanced Raman spectroscopy (SERS) with silicon nanowires decorated with silver nanoparticles as substrates for the determination of glutathione and malondialdehyde in water and saliva. Glutathione is detected by monitoring the reduction in Raman signal from substrates modified with crystal violet upon incubation with glutathione solutions, while malondialdehyde is detected after a reaction with thiobarbituric acid. The detection limits achieved for aqueous solutions are 50 and 3.2 nM for glutathione and malondialdehyde, respectively, and 2.0 and 0.32 μM for saliva.
Article
Nanoscience & Nanotechnology
Martha Pylarinou, Elias Sakellis, Polychronis Tsipas, George Em. Romanos, Spiros Gardelis, Athanasios Dimoulas, Vlassis Likodimos
Summary: Homojunction engineering between Mo- and Ca-doped BiVO4 nanocrystals in the skeleton of photonic band gap engineered inverse opals is introduced as a strategy to improve the efficiency of nanostructured metal oxide photocatalysts. The nanostructured homojunction Mo-BiVO4/Ca-BiVO4 photonic films outperformed their individual constituents in photocurrent generation and photocatalytic degradation rate under visible light, showing great potential for water remediation by pharmaceutical micropollutants.
ACS APPLIED NANO MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
J. Theocharis, D. Birmpiliotis, S. Gardelis, G. Papaioannou
Summary: This paper presents the potential distribution in a MEMS capacitor with a thin dielectric film and field emission leakage current, and demonstrates the accumulation of dielectric charging during this process. Current-voltage characteristics in clockwise and counter clockwise loops are analyzed to understand the transport mechanisms in MIM capacitors, and the same procedure is applied to monitor dielectric charging build-up during field emission in MEMS capacitors. The data obtained from pristine current-voltage characteristics in both MIM and MEMS are used to determine the voltage drops across the dielectric film and the gap, and their dependence on the flowing current.
MICROELECTRONICS RELIABILITY
(2023)
Article
Nanoscience & Nanotechnology
E. Hourdakis, A. Bardakas, A. Segkos, S. Tsilivaki, S. Gardelis, C. Tsamis
Summary: In this work, we have demonstrated a two-pixel solid-state photoluminescent device that can emit white light covering the entire visible spectrum from 380 nm to 800 nm. The combination of porous Si, hydrothermally grown ZnO, and carbon quantum dots enables independent actions of porous Si and ZnO, with carbon quantum dots deposited on top of the entire device. The use of standard Si processing techniques allows for cost-effective and environmentally safe production.
Article
Chemistry, Multidisciplinary
Stelios Loukopoulos, Elias Sakellis, Marios G. Kostakis, Dimitrios-Triantafyllos Gerokonstantis, Polychronis Tsipas, Spiros Gardelis, Athanassios G. Kontos, Fotis K. Katsaros, Zili Sideratou, George Em. Romanos, Athanasios Dimoulas, Nikolaos S. Thomaidis, Vlassis Likodimos
Summary: This study introduces heterostructured MoS2-TiO2 inverse opal films as highly active immobilized photocatalysts for the visible light-activated degradation of broad-spectrum antibiotics and salicylic acid. The integration of low amounts of MoS2 nanosheets into the nanocrystalline inverse opal walls enhances the available surface area and leads to efficient antibiotic degradation. The combination of MoS2 visible light absorption, photonic-assisted light trapping, and enhanced charge separation is a promising approach for pharmaceutical abatement in water bodies.
Proceedings Paper
Engineering, Electrical & Electronic
Georgios Chatzigiannakis, Angelina Jaros, Renaud Leturcq, Joergen Jungclaus, Tobias Voss, Spiros Gardelis, Maria Kandyla
Summary: ZnO/p-Si photodetectors developed by ALD deposition of ZnO thin films on laser-microstructured Si exhibit high sensitivity and broadband operation (UV-Vis-NIR) due to increased specific surface area at the heterojunction and enhanced light absorption.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
