Unraveling the Role of Non-Fullerene Acceptor with High Dielectric Constant in Organic Solar Cells

Zhang Y, He Y, Zeng L, Lüer L, Deng W, Chen Y, Zhou J, Wang Z, Brabec C, Wu H, Xie Z, Duan C (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Small Wiley-VCH Verlag

DOI: 10.1002/smll.202302314

Abstract

Increasing the relative dielectric constant is a constant pursuit of organic semiconductors, but it often leads to multiple changes in device characteristics, hindering the establishment of a reliable relationship between dielectric constant and photovoltaic performance. Herein, a new non-fullerene acceptor named BTP-OE is reported by replacing the branched alkyl chains on Y6-BO with branched oligoethylene oxide chains. This replacement successfully increases the relative dielectric constant from 3.28 to 4.62. To surprise, BTP-OE offers consistently lower device performance relative to Y6-BO in organic solar cells (16.27% vs 17.44%) due to the losses in open-circuit voltage and fill factor. Further investigations unravel that BTP-OE has resulted in reduced electron mobility, increased trap density, enhanced first order recombination, and enlarged energetic disorder. These results demonstrate the complex relationship between dielectric constant and device performance, which provide valuable implications for the development of organic semiconductors with high dielectric constant for photovoltaic application.

Authors with CRIS profile

Yakun He Institute Materials for Electronics and Energy Technology (i-MEET) Larry Lüer Institute Materials for Electronics and Energy Technology (i-MEET) Christoph Brabec 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)

How to cite

APA:

Zhang, Y., He, Y., Zeng, L., Lüer, L., Deng, W., Chen, Y.,... Duan, C. (2023). Unraveling the Role of Non-Fullerene Acceptor with High Dielectric Constant in Organic Solar Cells. Small. https://dx.doi.org/10.1002/smll.202302314

MLA:

Zhang, Yue, et al. "Unraveling the Role of Non-Fullerene Acceptor with High Dielectric Constant in Organic Solar Cells." Small (2023).

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