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Concurrent improvement in JSC and VOC in high-efficiency ternary organic solar cells enabled by a red-absorbing small-molecule acceptor with a high LUMO level

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Abstract

Ternary organic solar cells (OSCs) have demonstrated great potential in promoting the power conversion efficiency (PCE) of single-junction OSCs. Generally, the introduction of a third component with redshifted absorption spectra can broaden the absorption spectra and thereby potentially enhances short-circuit current density (JSC), but reduces open circuit voltage (VOC). Herein, a small-molecule acceptor (SMA) named N7IT with a high LUMO energy level and a redshifted absorption spectrum, is employed as the third component in the PM6:IT-4F-based binary host. Unlike previous results, the introduction of N71T enhances both the VOC and the JSC relative to the PM6:IT-4F host binary system. The champion ternary device (PM6 : IT-4F : N7IT = 1 : 0.7 : 0.3) demonstrates an outstanding PCE of 15.02%, significantly higher than its binary counterparts. This strategy is further validated in PM6:Y6 blends, where the addition of SY3 featuring near-infrared absorption and high LUMO effectively boosts the PCE from 16.49% to 17.07%. Our result proves the effectiveness of an appropriate third component and demonstrates the potential of red-absorbing, high-LUMO SMAs in further promoting the efficiency of single-junction binary OSCs.

Graphical abstract: Concurrent improvement in JSC and VOC in high-efficiency ternary organic solar cells enabled by a red-absorbing small-molecule acceptor with a high LUMO level

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Article information


Submitted
26 Jan 2020
Accepted
20 May 2020
First published
21 May 2020

Energy Environ. Sci., 2020, Advance Article
Article type
Paper

Concurrent improvement in JSC and VOC in high-efficiency ternary organic solar cells enabled by a red-absorbing small-molecule acceptor with a high LUMO level

T. Liu, R. Ma, Z. Luo, Y. Guo, G. Zhang, Y. Xiao, T. Yang, Y. Chen, G. Li, Y. Yi, X. Lu, H. Yan and B. Tang, Energy Environ. Sci., 2020, Advance Article , DOI: 10.1039/D0EE00662A

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