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13.26% Efficiency Polymer Solar Cells by Optimizing Photogenerated Exciton Distribution and Phase Separation with the Third Component
Author(s) -
Zhang Miao,
Zhang Zhuohan,
Wang Jian,
An Qiaoshi,
Peng Hongshang,
Tang Weihua,
Zhang Fujun
Publication year - 2019
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.201900269
Subject(s) - ternary operation , materials science , energy conversion efficiency , open circuit voltage , exciton , absorption (acoustics) , polymer solar cell , analytical chemistry (journal) , ternary numeral system , polymer , optoelectronics , phase (matter) , voltage , chemistry , organic chemistry , physics , quantum mechanics , computer science , composite material , programming language
Ternary polymer solar cells (PSCs) are designed by incorporating varied PC 71 BM into a PBDB‐T:INPIC‐Si‐based binary system. The PC 71 BM incorporation can replenish weak absorption of PBDB‐T and INPIC‐Si in the short wavelength from 300 to 500 nm. Effective charge transport channels can be formed in ternary active layers due to good compatibility of the used materials. The optimized ternary PSCs exhibit a power conversion efficiency (PCE) of 13.26% with short‐circuit current density ( J SC ) of 20.98 mA cm −2 , open‐circuit voltage of 0.892 V, and fill factor (FF) of 70.84%. The 13.26% PCE is among the top values for ternary PSCs with fullerene derivative and nonfullerene materials as acceptors. An approximately 12.5% PCE improvement is obtained compared with INPIC‐Si‐based binary PSCs, originating from simultaneously increased J SC and FF of the optimized ternary PSCs. The balanced photon harvesting is obtained in the whole wavelength range by regulating PC 71 BM content in acceptors, leading to increased J SC of ternary PSCs. The molecular arrangement and phase separation are well optimized in ternary blend films, resulting in the enhanced FF of ternary PSCs. The photogenerated exciton distribution is optimized according to optical field distribution of ternary active layers, which further support the J SC and FF improvement.