Morphology optimization via molecular weight tuning of donor polymer enables all-polymer solar cells with simultaneously improved performance and stability

Li Z, Zhong W, Ying L, Liu F, Li N, Huang F, Cao Y (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Nano Energy Elsevier

Book Volume: 64

Article Number: 103931

DOI: 10.1016/j.nanoen.2019.103931

Abstract

Organic solar cells with excellent device performance and stability are essential for both academic and industrial purposes. The molecular weight (Mn) of donor polymers plays a critical role in determining the photovoltaic properties of all-polymer solar cells (all-PSCs). Despite Mn of donor polymers has pronounced effects on microstructure morphology, photovoltaic performance and stability of all-PSCs are rarely analyzed and understood in high-performance devices. In this study, we systematically investigate the influence of Mn of donor polymers on the device performance metrics and device stability of all-PSCs comprising of a wide-bandgap polymer donor PTzBI-Si and a polymer acceptor N2200. All-PSCs based on high Mn of PTzBI-Si exhibit an excellent PCE of 11.5% with improved stability, which is clearly superior to that of all-PSCs based on low Mn of PTzBI-Si. The photovoltaic performance difference caused by Mn of PTzBI-Si is systematically characterized and analysed to establish the morphology-property-performance correlation. The findings demonstrated in our model system suggest that tuning the Mn of donor polymer could be a facile and promising strategy to simultaneously enhance the efficiency and stability of all-PSCs.

Authors with CRIS profile

Ning Li Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

South China University of Technology (SCUT) / 华南理工大学 CN China (CN) Shanghai Jiao Tong University / 上海交通大学 CN China (CN)

How to cite

APA:

Li, Z., Zhong, W., Ying, L., Liu, F., Li, N., Huang, F., & Cao, Y. (2019). Morphology optimization via molecular weight tuning of donor polymer enables all-polymer solar cells with simultaneously improved performance and stability. Nano Energy, 64. https://doi.org/10.1016/j.nanoen.2019.103931

MLA:

Li, Zhenye, et al. "Morphology optimization via molecular weight tuning of donor polymer enables all-polymer solar cells with simultaneously improved performance and stability." Nano Energy 64 (2019).

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