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High‐Performance Pseudoplanar Heterojunction Ternary Organic Solar Cells with Nonfullerene Alloyed Acceptor
Author(s) -
Wan Ji,
Zhang Lifu,
He Qiannan,
Liu Siqi,
Huang Bin,
Hu Lei,
Zhou Weihua,
Chen Yiwang
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201909760
Subject(s) - ternary operation , materials science , organic solar cell , polymer solar cell , acceptor , heterojunction , active layer , energy conversion efficiency , optoelectronics , chemical engineering , layer (electronics) , nanotechnology , polymer , composite material , condensed matter physics , physics , thin film transistor , computer science , engineering , programming language
The vast majority of ternary organic solar cells are obtained by simply fabricating bulk heterojunction (BHJ) active layers. Due to the inappropriate distribution of donors and acceptors in the vertical direction, a new method by fabricating pseudoplanar heterojunction (PPHJ) ternary organic solar cells is proposed to better modulate the morphology of active layer. The pseudoplanar heterojunction ternary organic solar cells (P‐ternary) are fabricated by a sequential solution treatment technique, in which the donor and acceptor mixture blends are sequentially spin‐coated. As a consequence, a higher power conversion efficiency (PCE) of 14.2% is achieved with a V oc of 0.79 V, J sc of 25.6 mA cm −2 , and fill factor (FF) of 69.8% compared with the ternary BHJ system of 13.8%. At the same time, the alloyed acceptor is likely formed between two the acceptors through a series of in‐depth explorations. This work suggests that nonfullerene alloyed acceptor may have great potential to realize effective P‐ternary organic solar cells.