Issue 5, 2023

Rationale for highly efficient and outdoor-stable terpolymer solar cells


Random terpolymerization is an effective approach to achieving highly efficient and outdoor-stable terpolymer photovoltaics. However, the working principle behind this remains unclear. Herein, we report spectroscopic, morphological, and computational results and conclude the previous work on terpolymer research to unveil their structure–property relations and elucidate key rules for high-efficiency and outdoor-stable terpolymer photovoltaics. More specifically, introducing a strong electron-deficient or electron-rich third moiety is suggested to enable broadened absorption with minimized non-radiative voltage losses. Besides, the third component should manipulate the D/A miscibility towards a thermodynamically more stable morphology. However, the content of the third component should be small to maintain molecular orientation and exciton diffusion length in conjunction with optimized phase-separation and crystallinity, in turn reducing bimolecular carrier recombination. Obeying these rules, terpolymer solar cells based on the parent donors D18 and PM6 with enhanced power conversion efficiency (PCE) and excellent outdoor stability are demonstrated. Our findings provide a rationale for explaining and achieving high-performance and outdoor-stable terpolymer photovoltaics, paving the path to commercialization.

Graphical abstract: Rationale for highly efficient and outdoor-stable terpolymer solar cells

Supplementary files

Article information

Article type
02 Feb 2023
14 Mar 2023
First published
14 Mar 2023
This article is Open Access
Creative Commons BY license

Energy Environ. Sci., 2023,16, 2056-2067

Rationale for highly efficient and outdoor-stable terpolymer solar cells

H. Tang, Z. Liao, S. Karuthedath, S. Chen, H. Liu, J. I. Khan, M. Babics, W. Yang, M. Alqurashi, Y. He, J. Gorenflot, J. Huang, G. Li, S. De Wolf, X. Lu, C. J. Brabec, F. Laquai and S. Lu, Energy Environ. Sci., 2023, 16, 2056 DOI: 10.1039/D3EE00350G

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

Read more about how to correctly acknowledge RSC content.

Social activity