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High‐Performance Green Solvent Processed Ternary Blended All‐Polymer Solar Cells Enabled by Complementary Absorption and Improved Morphology
Author(s) -
Li Zhenye,
Xie Ruihao,
Zhong Wenkai,
Fan Baobing,
Ali Jazib,
Ying Lei,
Liu Feng,
Li Ning,
Huang Fei,
Cao Yong
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.201800196
Subject(s) - ternary operation , materials science , chemical engineering , polymer , absorption (acoustics) , energy conversion efficiency , copolymer , absorption spectroscopy , optoelectronics , nanotechnology , composite material , optics , computer science , physics , engineering , programming language
Ternary all‐polymer solar cells (all‐PSCs) attract considerable research attention owing to the simplicity of the single‐junction device architecture and the broad absorption range of the light‐harvesting layer. However, the difficulty in controlling the morphology of ternary blended films makes it challenging to develop high‐performance ternary all‐PSCs. Herein, we report on the development of efficient ternary blended all‐PSCs by incorporating the narrow‐bandgap electron‐donating polymer PNTB, which contains a naphtho[1,2‐ c :5,6‐ c ′]bis([1,2,5]thiadiazole) moiety, into blend films comprising the wide‐bandgap electron‐donating copolymer PBTA‐BO and the electron‐accepting copolymer N2200. The resulting ternary blended devices reached an impressively high power conversion efficiency of 10.09%, which obviously outperforms those obtained from binary blended counterparts. The improved photovoltaic performance is attributable to the combined effects of the extended absorption profile, a favorable film morphology, and more efficient charge transfer. Of particular interest is that these ternary blend films are processed using a non‐halogenated solvent, 2‐methyltetrahydrofuran, which is promising for practical applications. These findings lend credence to the ternary approach as a facile and promising strategy for achieving high‐performance all‐PSCs.