Article
Chemistry, Physical
Lijun Su, Maria Mendez Malaga, Miaoli Zhu, Yaoming Xiao, Emilio Palomares Gil
Summary: Our study provides a comprehensive analysis of the kinetics of perovskite/organic photovoltaic interfaces with different perovskite I/Br ratios and PM6:Y6 blends. Through time resolved spectroscopy, we investigated carrier extraction and recombination kinetics to understand charge dynamics, which allowed us to foresee important differences in the perovskite internal electric field reorganization and the influence of electronic charge accumulation on performance.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Review
Chemistry, Multidisciplinary
Jun Yuan, Chujun Zhang, Beibei Qiu, Wei Liu, Shu Kong So, Mathieu Mainville, Mario Leclerc, Safa Shoaee, Dieter Neher, Yingping Zou
Summary: Organic solar cells (OSCs) have made rapid progress in recent years through the development of novel organic photoactive materials, particularly non-fullerene acceptors (NFAs). However, the understanding of the interplay between molecular structure and optoelectronic properties lags significantly behind. The potential role of energetic disorder in OSCs has received little attention, but recent studies have shown that state-of-the-art NFA-based devices can achieve both low energetic disorder and high power conversion efficiency (PCE).
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Physical
Xuning Zhang, Chao Li, Jianqiu Xu, Rui Wang, Jiali Song, Hong Zhang, Yanxun Li, Ya-Nan Jing, Shilin Li, Guangbao Wu, Jin Zhou, Xing Li, Yingying Zhang, Xiong Li, Jianqi Zhang, Chunfeng Zhang, Huiqiong Zhou, Yanming Sun, Yuan Zhang
Summary: This study reveals the impact of dielectric properties on the fill factor and photovoltaic efficiency of organic solar cells. By increasing the molecular packing density and dielectric constant, the fill factor and efficiency can be improved.
Article
Chemistry, Multidisciplinary
Anirudh Sharma, Lisa Sharma, Jules Bertrandie, Diego R. R. Villalva, Yajun Gao, Catherine S. P. De Castro, Joel Troughton, Julien Gorenflot, Frederic Laquai, Hugo Bronstein, Derya Baran
Summary: This study presents a material design approach for organic solar cells (OSCs) that isolates polymer chains with molecular encapsulation, resulting in reduced non-radiative voltage losses and improved performance and operational stability.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Materials Science, Multidisciplinary
Shashi Bhushan Srivastava, Rustamzhon Melikov, Erdost Yildiz, Ugur Meric Dikbas, Sadra Sadeghi, Ibrahim Halil Kavakli, Afsun Sahin, Sedat Nizamoglu
Summary: This study demonstrates a high-level transduction control of light to bioelectricity for superior neuron-device interfaces, using a high open-circuit voltage bulk heterojunction. The relationship between light intensity and voltage, as well as the impact of photovoltage on charge transfer speed, were investigated. Additionally, the potential of the biointerfaces with high open-circuit voltage for non-genetic, all-optical modulation of neurons was highlighted.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Energy & Fuels
Joachim Vollbrecht, Viktor V. Brus
Summary: This study focused on the importance and impact of non-geminate recombination in solar cells, deriving analytical expressions to understand its different processes. Experimental examples were used to support the analytical models, revealing the dominant recombination process in each case. Additionally, limitations of the analytical models and measurement techniques were discussed.
Article
Chemistry, Physical
Viktor V. Brus, Nora Schopp, Seo-Jin Ko, Joachim Vollbrecht, Jaewon Lee, Akchheta Karki, Guillermo C. Bazan, Thuc-Quyen Nguyen
Summary: The relationship between the temperature-light intensity dependence of open-circuit voltage V-oc in nonfullerene-based organic solar cells and the material characteristics and multimechanism recombination parameters was investigated. By systematically varying the effective bandgap E-g, E-eff and the electrode layers, different contributions of bimolecular, bulk, and surface trap-assisted recombination mechanisms were observed. The analytical model and voltage-impedance spectroscopy technique provide a useful tool to quantify multimechanism recombination parameters, effective density of states N-c, and energetic disorder sigma in organic solar cells under operating conditions. The proposed model's validity in understanding the temperature and light intensity dependence of V-oc was demonstrated by applying it to four different donor:nonfullerene acceptor blend systems with conventional or inverted device architectures.
ADVANCED ENERGY MATERIALS
(2021)
Article
Multidisciplinary Sciences
Yanan Shi, Yilin Chang, Kun Lu, Zhihao Chen, Jianqi Zhang, Yangjun Yan, Dingding Qiu, Yanan Liu, Muhammad Abdullah Adil, Wei Ma, Xiaotao Hao, Lingyun Zhu, Zhixiang Wei
Summary: This study reveals the relationship between reorganization energy and energy losses by designing and synthesizing two acceptors with smaller reorganization energies, providing direction for achieving high-performance organic solar cells.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Wei Li, Stefan Zeiske, Oskar J. Sandberg, Drew B. Riley, Paul Meredith, Ardalan Armin
Summary: This study demonstrates that using organic semiconductor systems based on NFAs can achieve near-unity charge generation yield, leading to a significant reduction in bimolecular recombination and improved performance of thick junction organic solar cells.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Chemistry, Physical
Wei Wei, Wen Chen, Xizhu Zhao, Zifan Yang, Yueli Liu
Summary: The introduction of PMMA buffer layer can significantly suppress the interface carrier recombination in all-inorganic CsPbI3 quantum dots perovskite solar cells, improve the open-circuit voltage, enhance the power conversion efficiency, and increase stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Zhizhao Cai, Xinyuan Ma, Jiefeng Cai, Zhenye Zhan, Dongxu Lin, Ke Chen, Pengyi Liu, Weiguang Xie
Summary: In this study, ultrathin BCP and ZrAcac were inserted between the perovskite and BHJ layers as an interface modification, successfully regulating carrier extraction and inhibiting charge recombination at the interface. This led to significant improvements in open-circuit voltage and fill factor, resulting in high conversion efficiency.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Multidisciplinary
Sohyeon Kim, Jun Hyeok Jang, Ziang Wu, Mi Jung Lee, Han Young Woo, Inchan Hwang
Summary: The study investigates the correlation of n(id), PL characteristics, and V-oc in triple-cation mixed-halide perovskite depending on interfacial crystal quality. It highlights the importance of evaluating interfacial crystal quality for understanding charge recombination and device optimization.
Article
Materials Science, Multidisciplinary
Qin Zhou, Chunsheng Cai, Qiu Xiong, Ping-Ping Sun, Zilong Zhang, Can Wang, Chi Li, Jingchuan Ye, Naoyuki Shibayama, Zhongyi Yuan, Peng Gao
Summary: In this study, a novel boron subnaphthalocyanine derivative was introduced into the perovskite film to passivate defects and modify the energetic positions, leading to outstanding performance and superior stability of perovskite solar cells.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Yongjoon Cho, Byoungkyu Lee, Sungwoo Jung, Seonghun Jeong, Jeewon Park, Geunhyung Park, Sangjin Yang, Changduk Yang
Summary: Understanding the thermodynamic and kinetic mechanisms of film formation is crucial for achieving high power conversion efficiencies in organic solar cells. This study investigates the correlation between non-fullerene acceptor types and processing cosolvent compositions, and finds that the outer side-chain length of the acceptor and the cosolvent composition greatly affect the crystalline behavior and performance of the active layers.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Physical
Jung-Hwa Park, Jaehoon Kim, Jin Hong Kim, Dong Won Kim, Chi Hyun Ryoo, Oh Kyu Kwon, Changhee Lee, Ji Eon Kwon, Soo Young Park
Summary: The study investigates the impact of alkyl chain length on the performance of all-small-molecule organic solar cells. It was found that increasing alkyl chain length led to a gradual increase in open-circuit voltage, attributed to the denser blend film formation with longer alkyl chain acceptors resulting in reduced voltage loss from nonradiative recombination.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Physics, Applied
Upkar K. Verma, Durgesh C. Tripathi, Y. N. Mohapatra
APPLIED PHYSICS LETTERS
(2016)
Article
Physics, Applied
Subhash Singh, Y. N. Mohapatra
JOURNAL OF APPLIED PHYSICS
(2016)
Article
Instruments & Instrumentation
K. Sudheendra Rao, Rakesh K. Sahoo, Tapan Dash, P. Magudapathy, B. K. Panigrahi, B. B. Nayak, B. K. Mishra
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2016)
Article
Physics, Applied
Upkar K. Verma, Sunil Kumar, Y. N. Mohapatra
JOURNAL OF APPLIED PHYSICS
(2017)
Article
Physics, Applied
Sunil Kumar, Upkar K. Verma, Y. N. Mohapatra
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Physics, Applied
K. Sudheendra Rao, Durgesh C. Tripathi, Y. N. Mohapatra
JOURNAL OF APPLIED PHYSICS
(2014)
Article
Optics
K. Sudheendra Rao, Y. N. Mohapatra
JOURNAL OF LUMINESCENCE
(2014)
Article
Physics, Multidisciplinary
Subhash Singh, Y. N. Mohapatra
Article
Physics, Applied
Purna Chandra Patra, Y. N. Mohapatra
Summary: Graphitic carbon nitride, a highly stable wide bandgap material, has potential for thin-film applications, especially when used in conjunction with Al2O3 to increase dielectric constant in sandwiched devices. The leakage current density is low and current transport mechanisms are mainly space charge limited, with a slight but significant difference between forward and reverse bias due to the presence of negative sheet charge at the interface between the two dielectrics.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Shikha Srivastava, Yashowanta N. Mohapatra
Summary: Layered molybdenum disulfide (MoS2) shows nontrivial departures in electrical properties compared to isotropic crystalline materials. The inter-layer mobility in mechanically exfoliated MoS2 flakes was experimentally studied, revealing impurity scattering as the dominant mechanism limiting mobility. The results provide insight into carrier transport engineering and design strategies based on MoS2 flakes.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Applied
Shikha Srivastava, Yashowanta N. Mohapatra
Summary: Molybdenum disulfide (MoS2) is a highly studied semiconducting material, with both monolayer and multilayer forms showing potential applications. Heterostructures, such as the Au|m-MoS2|ZnO device, play a key role in determining the electrical characteristics of these materials, offering insights into their behavior at different temperatures and charge transport mechanisms. This research highlights the importance of heterostructure diodes in facilitating the electrical and optical characterization of multilayer TMDCs.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Shikha Srivastava, Yashowanta N. Mohapatra
Summary: The study of deep defect states in multilayer MoS2 flakes is essential for electronic device applications. The defect density in natural and synthetic MoS2 flakes was found to be approximately 10^14 and 10^13 cm(-3) eV(-1) respectively, with both types showing a deep level around 0.8 eV below the conduction band edge.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Purna Chandra Patra, Y. N. Mohapatra
Summary: This study systematically investigates the use of g-C3N4 and Al2O3 as a double dielectric to control threshold and flat band voltage in a-IGZO MIS devices. The results show that the effective dielectric constant of the combination is larger and can lead to positive threshold shift without affecting the active interface at the semiconductor. The carrier density in the semiconductor remains relatively constant with frequency and temperature variations as measured from the depletion region.
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
(2021)
Article
Physics, Applied
Subhash Singh, Y. N. Mohapatra
APPLIED PHYSICS LETTERS
(2017)