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A Well‐Mixed Phase Formed by Two Compatible Non‐Fullerene Acceptors Enables Ternary Organic Solar Cells with Efficiency over 18.6%
Author(s) -
Cai Yunhao,
Li Yun,
Wang Rui,
Wu Hongbo,
Chen Zhihao,
Zhang Jie,
Ma Zaifei,
Hao Xiaotao,
Zhao Yong,
Zhang Chunfeng,
Huang Fei,
Sun Yanming
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202101733
Subject(s) - ternary operation , materials science , organic solar cell , energy conversion efficiency , fullerene , acceptor , tandem , phase (matter) , photocurrent , optoelectronics , open circuit voltage , chemical engineering , analytical chemistry (journal) , voltage , organic chemistry , polymer , chemistry , composite material , physics , quantum mechanics , computer science , engineering , programming language , condensed matter physics
The ternary strategy, introducing a third component into a binary blend, opens a simple and promising avenue to improve the power conversion efficiency (PCE) of organic solar cells (OSCs). The judicious selection of an appropriate third component, without sacrificing the photocurrent and voltage output of the OSC, is of significant importance in ternary devices. Herein, highly efficient OSCs fabricated using a ternary approach are demonstrated, wherein a novel non‐fullerene acceptor L8‐BO‐F is designed and incorporated into the PM6:BTP‐eC9 blend. The three components show complementary absorption spectra and cascade energy alignment. L8‐BO‐F and BTP‐eC9 are found to form a homogeneous mixed phase, which improves the molecular packing of both the donor and acceptor materials, and optimizes the ternary blend morphology. Moreover, the addition of L8‐BO‐F into the binary blend suppresses the non‐radiative recombination, thus leading to a reduced voltage loss. Consequently, concurrent increases in open‐circuit voltage, short‐circuit current, and fill factor are realized, resulting in an unprecedented PCE of 18.66% (certified value of 18.2%), which represents the highest efficiency values reported for both single‐junction and tandem OSCs so far.