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Pyrene‐Fused Perylene Diimides: New Building Blocks to Construct Non‐Fullerene Acceptors With Extremely High Open‐Circuit Voltages up to 1.26 V
Author(s) -
Zhan Xuejun,
Xiong Wentao,
Gong Yanbin,
Liu Tao,
Xie Yujun,
Peng Qian,
Sun Yanming,
Li Zhen
Publication year - 2017
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.201700123
Subject(s) - perylene , diimide , pyrene , fullerene , materials science , energy conversion efficiency , homo/lumo , block (permutation group theory) , open circuit voltage , acceptor , photochemistry , chemistry , optoelectronics , voltage , organic chemistry , molecule , physics , geometry , mathematics , quantum mechanics , condensed matter physics
Great efforts have been devoted to seeking alternative non‐fullerene acceptors for efficient polymer solar cells (PSCs). Achieving a high open‐circuit voltage ( V oc ) is quite challenging but is essential for practical application. Here, pyrene‐fused perylene diimide was first used as a periphery building block to construct non‐fullerene acceptors. Due to the high‐lying lowest unoccupied molecular orbitals (LUMOs) as well as balanced transport properties, the normal devices with the acceptors exhibited ultrahigh V oc values of up to 1.26 V. In addition, the achieved power‐conversion efficiency (PCE) of 5.10% is among the highest values for non‐fullerene PSCs with a V oc > 1.20 V, indicating that the pyrene‐fused perylene diimide (PDI) unit is a useful building block for the design of non‐fullerene PSCs with high V oc values. This study could benefit the realization of both a high PCE and V oc in PSCs.