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Constructing High‐Performance All‐Small‐Molecule Ternary Solar Cells with the Same Third Component but Different Mechanisms for Fullerene and Non‐fullerene Systems
Author(s) -
Chang Yanhong,
Chang Yilin,
Zhu Xiangwei,
Zhou Xuehua,
Yang Chen,
Zhang Jianqi,
Lu Kun,
Sun Xiangnan,
Wei Zhixiang
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201900190
Subject(s) - fullerene , ternary operation , materials science , molecule , acceptor , chemical physics , small molecule , energy conversion efficiency , band gap , charge (physics) , nanotechnology , optoelectronics , organic chemistry , condensed matter physics , chemistry , physics , computer science , programming language , biochemistry , quantum mechanics
Two types of all‐small‐molecule ternary solar cells consisting of two small‐molecule donors and one acceptor (fullerene/non‐fullerene) are developed. Interestingly, both these devices have a common component: a carefully designed medium bandgap small molecule, which possesses appropriate energy levels and displays good compatibility with the host donor. In the fullerene system, the charge‐relaying role of the additive donor is confirmed by the improved charge transportation and suppressed charge recombination. While in the non‐fullerene system, the mixed face‐on and edge‐on orientation of the ternary film induced by the additive donor dominates the promotion of charge transportation. Accordingly, both ternary devices deliver higher short‐circuit current density, fill factor, and power conversion efficiencies of over 10% compared to binary ones. This work offers a promising guideline on the construction of high‐performance all‐small‐molecule ternary solar cells by incorporating a miscible small‐molecule donor.