Organic-semiconductor-assisted dielectric screening effect for stable and efficient perovskite solar cells

Haiyang Chen; Qinrong Cheng; Heng Liu; Shuang Cheng; Shuhui Wang; Weijie Chen; Yunxiu Shen; Xinqi Li; Haidi Yang; Heyi Yang; Jiachen Xi; Ziyuan Chen; Xinhui Lu; Hongzhen Lin; Yaowen Li; Yongfang Li

doi:10.1016/j.scib.2022.04.011

Organic-semiconductor-assisted dielectric screening effect for stable and efficient perovskite solar cells

Sci Bull (Beijing). 2022 Jun 30;67(12):1243-1252. doi: 10.1016/j.scib.2022.04.011. Epub 2022 Apr 18.

Authors

Haiyang Chen¹, Qinrong Cheng¹, Heng Liu², Shuang Cheng³, Shuhui Wang¹, Weijie Chen¹, Yunxiu Shen¹, Xinqi Li¹, Haidi Yang¹, Heyi Yang¹, Jiachen Xi¹, Ziyuan Chen¹, Xinhui Lu², Hongzhen Lin³, Yaowen Li⁴, Yongfang Li⁵

Affiliations

¹ Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
² Department of Physics, Chinese University of Hong Kong, Hong Kong 999077, China.
³ i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.
⁴ Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China; State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Soochow University, Suzhou 215123, China. Electronic address: ywli@suda.edu.cn.
⁵ Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China; Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

PMID: 36546154
DOI: 10.1016/j.scib.2022.04.011

Abstract

Perovskite solar cells (pero-SCs) performance is essentially limited by severe non-radiative losses and ion migration. Although numerous strategies have been proposed, challenges remain in the basic understanding of their origins. Here, we report a dielectric-screening-enhancement effect for perovskite defects by using organic semiconductors with finely tuned molecular structures from the atoms level. Our method produced various perovskite films with high dielectric constant values, reduced charge capture regions, suppressed ion migration, and it provides an efficient charge transport pathway for suppressing non-radiative recombination beyond the passivation effect. The resulting pero-SCs showed a promising power conversion efficiency (PCE) of 23.35% with a high open-circuit voltage (1.22 V); and the 1-cm² pero-SCs maintained an excellent PCE (21.93%), showing feasibility for scalable fabrication. The robust operational and thermal stabilities revealed that this method paved a new way to understand the degradation mechanism of pero-SCs, promoting the efficiency, stability and scaled fabrication of the pero-SCs.

Keywords: Dielectric screening effect; Operational stability; Organic semiconductors; Perovskite solar cells; Reduced non-radiative recombination.