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High‐Efficient Charge Generation in Single‐Donor‐Component‐Based p‐i‐n Structure Organic Solar Cells
Author(s) -
Zhang Yajie,
Deng Dan,
Wu Qiong,
Mi Yang,
Yang Chen,
Zhang Xuning,
Yang Yang,
Zou Wenjun,
Zhang Jianqi,
Zhu Lingyun,
Zhou Huiqiong,
Liu Xinfeng,
Wei Zhixiang
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201900580
Subject(s) - organic solar cell , energy conversion efficiency , acceptor , electron donor , photovoltaic system , materials science , electron acceptor , charge (physics) , chemistry , optoelectronics , photochemistry , organic chemistry , physics , electrical engineering , catalysis , condensed matter physics , quantum mechanics , engineering
Organic solar cells (OSCs) require a bulk heterojunction of a donor and an acceptor for efficient charge generation, whereas other types of solar cells normally use the p‐i‐n device structure. Herein, a comparative investigation of the p‐i‐n‐structured OSCs is conducted based on single‐donor‐component BTID‐0F and the bulkheterojuction OSCs with different donor:acceptor blend ratios using BTID‐0F as the donor and PC 71 BM as the acceptor. The highest power conversion efficiency (PCE) of 1.61% is obtained for single‐donor‐based OSCs. The impact of PC 71 BM weight ratio in BTID‐0F:PC 71 BM‐based OSCs upon blend morphology, material energetics, photogenerated charge dynamic process, and photovoltaic device performance is investigated, and the highest PCE reaches 8.47%. Results indicate that even when the acceptor sites are highly diluted and the acceptor phase is discontinuous, electron transport can occur with a reasonable electron mobility. The PCE of 1.61% is the highest PCE reported for p‐i‐n structure OSCs based on a single‐donor component, which is helpful to understand the mechanism of charge generation in organic materials and thus obtainhigh‐efficient OSCs using the p‐i‐n structure.