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Binary Solvent Additives Treatment Boosts the Efficiency of PTB7:PCBM Polymer Solar Cells to Over 9.5%
Author(s) -
Zheng Yifan,
Wang Gang,
Huang Di,
Kong Jaemin,
Goh TengHooi,
Huang Wei,
Yu Junsheng,
Taylor André D.
Publication year - 2018
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.201700144
Subject(s) - crystallinity , materials science , energy conversion efficiency , polymer solar cell , chemical engineering , thiophene , crystallization , solvent , acceptor , active layer , phase (matter) , polymer , organic chemistry , chemistry , layer (electronics) , optoelectronics , nanotechnology , composite material , physics , engineering , condensed matter physics , thin film transistor
In this work, a 9.5% of power conversion efficiency (PCE) is obtained in the thieno [3,4‐b] thiophene/benzodithiophene (PTB7): (6,6)‐phenyl‐C 70 ‐butyric acid methyl ester (PC 70 BM) based polymer solar cell (PSC) by using a novel binary solvent additive of diphenyl ether (DPE): 1,8‐diiodoctane (DIO). We find that this binary solvent additive approach increases the PTB7 donor crystallinity using DPE and enhances the PC 70 BM dispersion using DIO. This amended aggregation results in a better donor/acceptor phase separation. We show that the improved crystallization and face‐on orientation preference of PTB7 contributes to higher light absorption and charge transport efficiency in the active layer. Moreover, a better D/A phase separation provides more efficient charge extraction and suppresses the charge recombination, leading to an improved FF >70%.