Enabling low voltage losses and high photocurrent in fullerene-free organic photovoltaics

Jun Yuan(Central South University), Tianyi Huang(University of California, Los Angeles), Pei Cheng(University of California, Los Angeles), Yingping Zou(Central South University), Huotian Zhang(Linköping University), Jonathan Lee Yang(University of California, Los Angeles), Sheng‐Yung Chang(University of California, Los Angeles), Zhenzhen Zhang(Central South University), Wenchao Huang(University of California, Los Angeles), Rui Wang(University of California, Los Angeles), Dong Meng(California NanoSystems Institute), Feng Gao(Linköping University), Yang Yang(California NanoSystems Institute)
Nature Communications
February 4, 2019
10.1038/s41467-019-08386-9
Cited by 480Open Access
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Abstract

Abstract Despite significant development recently, improving the power conversion efficiency of organic photovoltaics (OPVs) is still an ongoing challenge to overcome. One of the prerequisites to achieving this goal is to enable efficient charge separation and small voltage losses at the same time. In this work, a facile synthetic strategy is reported, where optoelectronic properties are delicately tuned by the introduction of electron-deficient-core-based fused structure into non-fullerene acceptors. Both devices exhibited a low voltage loss of 0.57 V and high short-circuit current density of 22.0 mA cm −2 , resulting in high power conversion efficiencies of over 13.4%. These unconventional electron-deficient-core-based non-fullerene acceptors with near-infrared absorption lead to low non-radiative recombination losses in the resulting organic photovoltaics, contributing to a certified high power conversion efficiency of 12.6%.

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