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Over 17.6% Efficiency Organic Photovoltaic Devices with Two Compatible Polymer Donors
Author(s) -
Xu Chunyu,
Ma Xiaoling,
Zhao Zijin,
Jiang Mengyun,
Hu Zhenghao,
Gao Jinhua,
Deng Zhengqi,
Zhou Zhengji,
An Qiaoshi,
Zhang Jian,
Zhang Fujun
Publication year - 2021
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.202100175
Subject(s) - ternary operation , materials science , open circuit voltage , polymer , active layer , energy conversion efficiency , polymer blend , organic solar cell , short circuit , analytical chemistry (journal) , voltage , optoelectronics , nanotechnology , chemistry , organic chemistry , composite material , electrical engineering , copolymer , layer (electronics) , computer science , programming language , engineering , thin film transistor
Efficient ternary blend organic photovoltaic devices (OPVs) are built based on a D18‐Cl:Y6 host system and star polymer donor PM6 as the third component. A power conversion efficiency (PCE) of 16.89% is achieved in D18‐Cl:Y6 host binary OPVs, with a short‐circuit current density ( J SC ) of 25.31 mA cm −2 , an open‐circuit voltage ( V OC ) of 0.878 V, and a fill factor (FF) of 75.81%. Upon incorporating appropriate PM6 in active layers, the PCE of optimal ternary blend OPVs can be increased to 17.61%, benefiting from a J SC of 26.35 mA cm −2 , a V OC of 0.871 V, and an FF of 76.82%. Polymers D18‐Cl and PM6 have good compatibility and similar highest occupied molecular orbital (HOMO) levels, which enable to form D18‐Cl:PM6 alloyed states for efficient hole transport in ternary blend active layers. Meanwhile, trap density in ternary blend active layers is decreased by incorporating PM6, which is conducive to weaken charge recombination in ternary blend active layers. The gradually varied V OC values of ternary blend OPVs can be well explained from the varied HOMO levels of D18‐Cl:PM6 alloyed states. The results indicate that two compatible polymer donors with similar HOMO levels have great potential in achieving efficient ternary blend OPVs.