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386 results on '"Zhang, Maojie"'

29. 16% efficiency all-polymer organic solar cells enabled by a finely tuned morphology via the design of ternary blend

Author

Liu, Tao, Yang, Tao, Ma, Ruijie, Zhan, Lingling, Luo, Zhenghui, Zhang, Guangye, Li, Yuan, Gao, Ke, Xiao, Yiqun, Yu, Jianwei, Zou, Xinhui, Sun, Huiliang, Zhang, Maojie, Dela Peña, Top Archie, Xing, Zengshan, Liu, Heng, Li, Xiaojun, Li, Gang, Huang, Jianhua, Duan, Chunhui, Wong, Kam Sing, Lu, Xinhui, Guo, Xugang, Gao, Feng, Chen, Hongzheng, Huang, Fei, Li, Yongfang, Li, Yuliang, Cao, Yong, Tang, Bo, and Yan, He

Published
2021
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35. Non‐Fully Conjugated Photovoltaic Materials with Y‐Series Acceptor Backbone for High‐Performance Organic Solar Cells†.

Author

Bai, Hairui, Fan, Qunping, Ma, Ruijie, Guo, Xia, Ma, Wei, and Zhang, Maojie

Subjects
SOLAR cells, PHOTOVOLTAIC power systems, ORGANIC electronics, SPINE
Abstract

Comprehensive Summary: In the last few years, organic solar cells (OSCs) have made significant progress in photovoltaic performance, mainly due to the innovative development of active layer materials, especially Y‐series and related derivatives as acceptors which have become the key factor that boosts the power conversion efficiency. Recently, to achieve high‐performance OSCs, an emerging molecular design strategy of applying flexible alkyl units as linkers to construct non‐fully conjugated acceptors has been developed and addressed great attention. This review highlights the non‐fully conjugated photovoltaic materials with Y‐series backbone that enable high‐performance OSCs. Impressive OSCs have been achieved by some representative non‐fully conjugated material systems. The related molecular design strategies are discussed in detail. Finally, a brief summary and future prospect are provided in advancing the non‐fully conjugated photovoltaic materials with Y‐series backbone towards the brighter future. Key Scientists: [ABSTRACT FROM AUTHOR]

Published
2024
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48. π‐Extended End Groups Enable High‐Performance All‐Polymer Solar Cells with Near‐Infrared Absorption.

Author

Yu, Linfeng, Xiao, Haiqin, Shi, Yu, Guo, Xia, Xia, Xinxin, Lu, Xinhui, and Zhang, Maojie

Abstract

Comprehensive Summary: Narrow‐bandgap n‐type polymers are essential for advancing the development of all‐polymer solar cells (all‐PSCs). Herein, we developed a novel polymer acceptor PNT with π‐extended 2‐(3‐oxo‐2,3‐dihydro‐1H‐cyclopenta[b]naphthalen‐1‐ylidene) malononitrile (CPNM) end groups. Compared to commonly used 2‐(3‐oxo‐2,3‐dihydro‐1H‐cyclopenta[b]naphthalen‐1ylidene) malononitrile (IC) units, CPNM units have a further extended fused ring, providing the PNT polymer with extended absorption into the near‐IR region (903 nm) and exhibiting a narrow optical bandgap (1.37 eV). Furthermore, PNT exhibits a high electron mobility (6.79 × 10−4 cm2·V−1·S−1) and a relatively high‐lying lowest unoccupied molecular orbital (LUMO) energy level of −3.80 eV. When blended with PBDB‐T, all‐PSC achieves a power conversion efficiency (PCE) of 13.7% and a high short‐circuit current density (JSC) of 24.4 mA·cm−2, mainly attributed to broad absorption (600—900 nm) and efficient charge separation and collection. Our study provides a promising polymer acceptor for all‐PSCs and demonstrates that π‐extended CPNM units are important to achieve high‐performance for all‐PSCs. [ABSTRACT FROM AUTHOR]

Published
2023
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49. Unraveling High Reproducibility and Broad Composition Tolerance in High‐Efficiency Organic Solar Cells via Sequential Deposition.

Author

Gui, Ruohua, Xian, Kaihu, Shi, Yu, Zhang, Wenqing, Qiao, Jiawei, Fu, Zhen, Wang, Jingjing, Cui, Fengzhe, Wang, Qian, Wong, Vox Kalai, Lu, Peng, So, Shu Kong, Zhang, Maojie, Ye, Long, Li, Gang, Hao, Xiaotao, and Yin, Hang

Subjects
SOLAR cells, CHARGE carriers, PHOTOVOLTAIC power systems, MOLECULAR weights, HETEROJUNCTIONS, COMMERCIALIZATION
Abstract

The reproducibility issue is impeding the progress of commercialization in organic photovoltaic (OPV) devices, as the difficulty in precise micro‐nano structure control in bulk heterojunction films, as well as the ineluctable fluctuations of molecular weight and polydispersity index in the synthetic process. Due to such intrinsic properties, the poor regioregularity significantly affects the batch‐to‐batch variation in performance of large‐area or integrative scattered OPV devices. Seeking alternatives as compensatory strategies is expected to reduce the inevitable problem of reproducibility in the fabrication process. Herein, the application potential of a pseudo‐bilayer structure in high‐performance OPVs, by using the solution‐processed method is thoroughly examined, and it is observed that the sequentially‐deposited solar cells enjoy improve device reproducibility in addition to the power conversion efficiency (PCE) enhancement. Importantly, such desirable reproducibility in layer‐by‐layer structures raised from the film formation process provides new opportunities in ternary OPV devices, and an improved PCE of 18.70% can be achieved in a PM6/L8‐BO:PY‐IT device, where the counterpart ternary cases exhibit a decreasing trend in performance with the increasing content of PY‐IT. This work illustrates the spatial effects of pseudo‐bilayer OPV devices in the aspect of charge carrier transport/transfer, morphology and film formation kinetics, and provides a novel perspective to overcome the barriers to commercialization. [ABSTRACT FROM AUTHOR]

Published
2023
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50. On the Conformation of Dimeric Acceptors and Their Polymer Solar Cells with Efficiency over 18 %.

Author

Wu, Jingnan, Ling, Zhaoheng, Franco, Leandro R., Jeong, Sang Young, Genene, Zewdneh, Mena, Josué, Chen, Si, Chen, Cailing, Araujo, C. Moyses, Marchiori, Cleber F. N., Kimpel, Joost, Chang, Xiaoming, Isikgor, Furkan H., Chen, Qiaonan, Faber, Hendrik, Han, Yu, Laquai, Frédéric, Zhang, Maojie, Woo, Han Young, and Yu, Donghong

Subjects
SOLAR cell efficiency, DIMERS, MOLECULAR conformation, SOLAR cells, POLYMERS
Abstract

The determination of molecular conformations of oligomeric acceptors (OAs) and their impact on molecular packing are crucial for understanding the photovoltaic performance of their resulting polymer solar cells (PSCs) but have not been well studied yet. Herein, we synthesized two dimeric acceptor materials, DIBP3F‐Se and DIBP3F‐S, which bridged two segments of Y6‐derivatives by selenophene and thiophene, respectively. Theoretical simulation and experimental 1D and 2D NMR spectroscopic studies prove that both dimers exhibit O‐shaped conformations other than S‐ or U‐shaped counter‐ones. Notably, this O‐shaped conformation is likely governed by a distinctive "conformational lock" mechanism, arising from the intensified intramolecular π–π interactions among their two terminal groups within the dimers. PSCs based on DIBP3F‐Se deliver a maximum efficiency of 18.09 %, outperforming DIBP3F‐S‐based cells (16.11 %) and ranking among the highest efficiencies for OA‐based PSCs. This work demonstrates a facile method to obtain OA conformations and highlights the potential of dimeric acceptors for high‐performance PSCs. [ABSTRACT FROM AUTHOR]

Published
2023
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