Article
Materials Science, Multidisciplinary
Yuhan Zhou, Dongdong Yan, Han Zhang, Yi Jing, Linfeng Chao, Mingguang Li, Meicheng Li, Yonghua Chen, Runfeng Chen, Ligang Xu
Summary: A new stable intermediate phase adduct (SnI2•DMSO•MAFa) is introduced to fabricate high-quality FA(0.75)MA(0.25)SnI(3) films, resulting in higher power conversion efficiency and improved stability of tin perovskite solar cells.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Physical
Bingbing Chen, Pengyang Wang, Renjie Li, Ningyu Ren, Wei Han, Zhao Zhu, Jin Wang, Sanlong Wang, Biao Shi, Jingjing Liu, Pengfei Liu, Qian Huang, Shengzhi Xu, Ying Zhao, Xiaodan Zhang
Summary: A two-step sequential deposition method has been successfully applied to narrow-bandgap perovskite solar cells, resulting in improved efficiency and area for monolithic perovskite/silicon tandem solar cells, as well as for an enlarged-scaled tandem device.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Lidia Romani, Andrea Speltini, Francesco Ambrosio, Edoardo Mosconi, Antonella Profumo, Marcello Marelli, Serena Margadonna, Antonella Milella, Francesco Fracassi, Andrea Listorti, Filippo De Angelis, Lorenzo Malavasi
Summary: This study presents a water-stable metal halide perovskite and demonstrates its application in promoting photocatalysis in aqueous medium, leading to impressive hydrogen evolution rate. The composite with g-C3N4 shows synergistic activity and efficient photocatalytic performance in water, paving the way for a new class of light-driven catalysts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Hui Zhang, Shurong Wang, Huanhuan Yao, Zhiyue Tang, Liming Ding, Feng Hao
Summary: In this study, the phase separation of PEDOT and PSS chains in the film was controlled by ammonium carbamate (AC), resulting in a modified film with lower trap density and more facile carrier transport. As a result, tin halide perovskite solar cells (TPSCs) using the modified PEDOT:PSS film achieved a significantly improved short-circuit photocurrent (J(sc)), open-circuit voltage (V-oc), and power conversion efficiency (PCE).
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Ming Chen, Zhicheng Shan, Xiaofeng Dong, Shengzhong(Frank) Liu, Zhuo Xu
Summary: To explore stable lead-free perovskites for solar cell applications, a series of Dion-Jacobson (DJ) double perovskites with the formula BDA(2)M(I)M(III)X(8) were proposed. First-principles calculations demonstrated the thermal stabilities of all the proposed BDA(2)M(I)M(III)X(8) perovskites. Three candidates with suitable solar band gaps and superior optoelectronic properties were selected for photovoltaic application. The study provides a new concept for designing lead-free perovskites for efficient solar cells.
NANOSCALE HORIZONS
(2023)
Article
Chemistry, Multidisciplinary
Jiacheng He, Wangping Sheng, Jia Yang, Yang Zhong, Yang Su, Licheng Tan, Yiwang Chen
Summary: A porous PbI2 layer with ordered array structure is successfully fabricated by integrating a succinamide (SA) additive with nanoimprinting technology, leading to omnidirectional diffusion and sufficient conversion to perovskites. The unencapsulated device achieves an efficiency of 23.56% and excellent long-term humidity stability. The perovskite solar cell and module achieve impressive efficiencies of 21.57% and 16.42%, respectively. This work paves the way for large-scale fabrication of high-performance perovskite photovoltaic devices.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Peng Zhai, Lixia Ren, Shuqin Li, Lu Zhang, Deng Li, Shengzhong (Frank) Liu
Summary: By utilizing a light modulation strategy, perovskite materials can be prepared in a non-toxic water solvent, offering a feasible avenue for authentic green synthesis. The water-processed perovskite exhibits high efficiency and environmental stability.
Article
Multidisciplinary Sciences
Dexin Yang, Guoling Zhang, Runchen Lai, Yao Cheng, Yaxiao Lian, Min Rao, Dexuan Huo, Dongchen Lan, Baodan Zhao, Dawei Di
Summary: The research demonstrates highly luminescent germanium-lead (Ge-Pb) perovskite films with considerably improved photoluminescence quantum efficiencies compared to other lead-based perovskite films, offering a new solution for developing eco-friendly light-emitting technologies based on perovskite semiconductors.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Quinten A. Akkerman
Summary: In this work, monodisperse spheroidal CsPb(Cl:Br)3 quantum dots were successfully synthesized, and the size and composition of these dots were directly determined by the energy of their excitonic absorption transitions. This method not only saves time and cost, but also has important implications for the research and application of CsPb(Cl:Br)3 quantum dots.
Article
Chemistry, Multidisciplinary
Long Ji, Ting Zhang, Yafei Wang, Detao Liu, Hao Chen, Hualin Zheng, Xuefeng Peng, Shihao Yuan, Zhi David Chen, Shibin Li
Summary: The addition of ethylammonium bromide (EABr) to the methylammonium tin iodide (MASnI(3)) perovskite precursor solution can regulate the crystallization dynamics, improve film morphology, and enhance efficiency and stability of the perovskite solar cells. The combination of EA(+) and Br- ions in the precursor solution results in a champion power conversion efficiency (PCE) of 9.59% and maintains 93% of initial efficiency after 30 days without encapsulation. This work provides a new strategy for high-efficiency tin-based perovskite solar cells.
Article
Chemistry, Physical
Yijin Wei, Zhipeng Shao, Zhipeng Li, Caiyun Gao, Xiuhong Sun, Qiangqiang Zhao, Lianzheng Hao, Bingqian Zhang, Dachang Liu, Xianzhao Wang, Changcheng Cui, Qi Huang, Yaliang Han, Xiao Wang, Guanglei Cui, Shuping Pang
Summary: A Cs2PbI2Cl2 intermediate method was developed to prepare high-quality wide bandgap perovskite films, which effectively controlled defect density and improved the efficiency of solar cells.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Christine Fiedler, Tobias Kleinhanns, Maria Garcia, Seungho Lee, Mariano Calcabrini, Maria Ibanez
Summary: This article introduces a synthetic approach for producing dense inorganic thermoelectric materials by controlling the synthesis of nanoparticle powders. Solution synthesis allows control over particle size, shape, crystal structure, composition, and surface chemistry. However, most studies have focused on the cost benefits of this strategy. The article first covers the opportunities provided by solution processing, emphasizing the control of structural features through precise engineering of the particles. The challenges and practical matters related to solution processing are then discussed.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Christine Fiedler, Tobias Kleinhanns, Maria Garcia, Seungho Lee, Mariano Calcabrini, Maria Ibanez
Summary: This article introduces a synthetic approach for producing dense inorganic thermoelectric materials by controlling the characteristics of nanopartide powders. Solution processing allows for unprecedented control over particle characteristics, providing researchers with opportunities to control structural features of the materials. However, this method still faces challenges and practical issues.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Xinbo Ma, Zhenyu Li
Summary: This paper describes a method to increase the efficiency of solar cells by introducing an intermediate band (IB) in the band gap. A new formulism is proposed to calculate the efficiency limit of IB solar cells without the ideal absorption assumption. New IB materials are designed using double perovskite doping, which exhibit strong absorption within the band gap. The results provide new insights for the rational design of IB solar cell materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Engineering, Environmental
Arindam Mallick, Rene D. Mendez Lopez, Gilboa Arye, David Cahen, Iris Visoly- Fisher
Summary: Perovskite photovoltaics are efficient and low-cost solar energy harvesting technology, but the presence of lead cations in the materials raises environmental concerns. It is crucial to quantify the potential hazard of lead leaching into the soil to assess the sustainability of this technology. Previous research showed that lead from inorganic salts remained in the upper soil layers due to adsorption, but perovskites contain additional organic and inorganic cations, which may affect the adsorption process.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Physics, Applied
Tomoya Koga, Ryo Tamaki, Xiang Meng, Yushin Numazawa, Yosuke Shimura, Nazmul Ahsan, Yoshitaka Okada, Akihiro Ishida, Hirokazu Tatsuoka
Summary: Creating vertically aligned 2D nanostructures, such as Mg2Si nanosheet bundles, from Ca atom extraction from CaSi2 microwalls grown on Si substrates via thermal annealing in a MgCl2/Mg mixed vapor has shown promise for achieving advanced electronic and optoelectronic materials. The observed Mg2Si nanosheets consist of thin Mg2Si layers, and well-defined fine-scale Mg2Si superlattice-like structures were achieved in the nanosheet bundles. Structural modification of layered crystals is a useful technique to obtain tailored properties and functionalities of the nanosheet bundles.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Yaxing Zhu, Shigeo Asahi, Kohei Watanabe, Naoya Miyashita, Yoshitaka Okada, Takashi Kita
Summary: The intermediate-band solar cell utilizes sub-bandgap photons to potentially exceed the conversion limits of traditional photovoltaic devices. Output voltage preservation is theoretically achievable with independent quasi-Fermi levels, demonstrated experimentally through voltage recovery induced by two-step photon absorption processes. The excitation-power and temperature dependencies on voltage performance are studied in a cell containing InAs quantum dots, with findings suggesting a balance is crucial and higher temperatures result in faster carrier annihilation.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yasushi Shoji, Ryo Tamaki, Yoshitaka Okada
Summary: The use of GaSb quantum nanostructures in intermediate-band solar cells (IBSCs) has shown promising results, with GaSb quantum dots and quantum rings successfully fabricated on AlGaAs layers. The mechanism of current generation via two-step optical excitations through the intermediate band has been demonstrated through these structures.
Article
Physics, Multidisciplinary
Tomah Sogabe, Chao-Yu Hung, Ryo Tamaki, Stanko Tomic, Koichi Yamaguchi, Ned Ekins-Daukes, Yoshitaka Okada
Summary: This paper introduces the concept of a novel "ratchet type" intermediate band solar cell, utilizing long-lifetime rare-earth ion luminescence centers in Erbium-doped GaAs. Temperature-dependent differential external quantum efficiency studies show a significant contribution from Er3+ luminescence centers in this system. Simulation results indicate that the long lifetime energy transfer mechanism of Er3+ ions plays a key role in the formation of the "ratchet type" intermediate band solar cell.
COMMUNICATIONS PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Maxime Giteau, Yusuke Oteki, Kento Kitahara, Naoya Miyashita, Ryo Tamaki, Yoshitaka Okada
Summary: This study develops a theoretical framework to evaluate and optimize resonant light absorption in a thin slab with multiple quantum layers. Numerical simulations and experimental measurements confirm that the position of the layers strongly influences absorption, with an optimal position leading to a resonant absorption enhancement twice as large as the average.
JOURNAL OF PHOTONICS FOR ENERGY
(2022)
Article
Optics
Ryo Tamaki, Tatsuki Kasai, Gaku Asai, Daiki Hata, Hajime Kubo, Yuichi Takigawa, Jun Takeda, Ikufumi Katayama
Summary: By using highly sensitive single-shot terahertz time-domain spectroscopy, the pulseto-pulse temporal profile of terahertz radiation generated from the material surface during laser ablation was investigated. The study revealed that the carrier-envelope phase and electric field amplitude of the terahertz waveform systematically vary depending on the laser fluence and irradiated pulse numbers.
Article
Materials Science, Multidisciplinary
Muhammad Akmal Kamarudin, Shahrir Razey Sahamir, Teresa S. Ripolles, Kohei Nishimura, Shen Qing, Shuzi Hayase
Summary: Tin halide perovskites are the leading material for lead-free perovskite solar cells, with the highest efficiency reaching 15%. However, there are several issues that need to be addressed, such as oxidation, fast crystallization, energy mismatch, and current-voltage hysteresis. In this experiment, we incorporated Cs+ ions to reduce the energy mismatch and improve the efficiency of tin perovskite solar cells to more than 13% when used together with PCBM as the ETL. Impedance spectroscopy analysis showed that the enhancement is due to better energy level alignment between the perovskite layer and ETL.
ORGANIC ELECTRONICS
(2023)
Article
Energy & Fuels
Bernice Mae Yu Jeco-Espaldon, Ryo Tamaki, Maxime Giteau, Hao Xu, Nazmul Ahsan, Richard R. King, Yoshitaka Okada
Summary: Perimeter recombination is one of the causes for the nonuniform luminescent coupling effect in III-V multijunction solar cells. Electrical passivation of the multijunction solar cell perimeter can significantly improve current collection and homogeneity, resulting in an increase in absolute conversion efficiency.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Yusuke Oteki, Maxime Giteau, Kei Fukushima, Kento Kitahara, Naoya Miyashita, Ryo Tamaki, Yoshitaka Okada
Summary: This study investigates the impact of light trapping on quantum dot intermediate band solar cells and demonstrates that optimizing the positions of quantum dot layers and placing them at resonance intensity peaks can enhance optical absorption. This effect can be applied to improve the performance of solar cells and photodetectors.
6TH IEEE ELECTRON DEVICES TECHNOLOGY AND MANUFACTURING CONFERENCE (EDTM 2022)
(2022)
Proceedings Paper
Energy & Fuels
Bernice Mae F. Yu Jeco, Achilles E. Espaldon, Tomoyasu Sado, Kentaroh Watanabe, Kumiko Oguma, Yoshitaka Okada
2020 47TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
(2020)
Proceedings Paper
Energy & Fuels
Bernice Mae F. Yu Jeco, Hao Xu, Masakazu Sugiyama, Yoshitaka Okada
2020 47TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
(2020)
Article
Materials Science, Multidisciplinary
Bernice Mae Yu Jeco-Espaldon, Haibin Wang, Achilles E. Espaldon, Takaya Kubo, Hiroshi Segawa, Nazmul Ahsan, Yoshitaka Okada
JOURNAL OF PHOTONICS FOR ENERGY
(2020)
