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Binary Additive–Induced Performance Improvement of PM7:PC 71 BM Organic Solar Cells with High Open‐Circuit Voltage and Enhanced Current Intensity
Author(s) -
Zhang Yingying,
Dai Tingting,
Zhou Xuejiao,
Hu Rong,
Li Xiong,
Xu Denghui
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000710
Subject(s) - photocurrent , materials science , open circuit voltage , acceptor , organic solar cell , active layer , energy conversion efficiency , short circuit , polymer solar cell , electron mobility , charge carrier , current density , analytical chemistry (journal) , chemical engineering , optoelectronics , voltage , chemistry , layer (electronics) , organic chemistry , nanotechnology , electrical engineering , physics , thin film transistor , condensed matter physics , quantum mechanics , composite material , engineering , polymer
Adding a solvent additive into the active layer is a simple and effective strategy to improve active layer morphology and performance of bulk heterojunction organic solar cells (OSCs). Herein, poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl‐3‐chloro)thiophen‐2‐yl)‐benzo[1,2‐b:4,5‐b′]dithiophene))‐alt‐(5,5‐(1′,3′‐di‐2‐thienyl‐5′,7′‐bis(2‐ethylhexyl)benzo[1′,2′‐c:4′,5′‐c′]dithiophene‐4,8‐dione)] (PM7) is used as donor and [6,6]‐phenyl‐C71‐butyric acid methyl ester (PC 71 BM) as acceptor, and 1,8‐diiodooctane (DIO) and 1‐chloronthalene (CN) are utilized as solvent additives to prepare OSCs. The impact of binary additives on the photoelectric performance of OSCs is studied. The binary additives restrict charge recombination and improve carrier mobility effectively, which is proved by the transient photovoltage/transient photocurrent measurement and photoinduced charge carrier extraction by linearly increasing the voltage technology. With the synergetic effect of DIO and CN, the binary additive devices exhibit a high open‐circuit voltage of 0.96 V. Apart from the improved short‐circuit current density and fill factor, the power conversion efficiency reaches to 9.85%, much higher than that of the pristine device without additive (3.79%).