Unfused Electronic Acceptor-Based Polymers as Interfacial Materials for Efficient Inverted Perovskite Solar Cells

Jianchao Jia; Fei Wu; Linna Zhu; Chuluo Yang

doi:10.1021/acsami.1c09269

Unfused Electronic Acceptor-Based Polymers as Interfacial Materials for Efficient Inverted Perovskite Solar Cells

ACS Appl Mater Interfaces. 2021 Jul 21;13(28):33328-33334. doi: 10.1021/acsami.1c09269. Epub 2021 Jul 7.

Authors

Jianchao Jia¹, Fei Wu², Linna Zhu², Chuluo Yang¹

Affiliations

¹ Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China.
² Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy, Faculty of Materials & Energy, Southwest University, Chongqing 400715, China.

PMID: 34229426
DOI: 10.1021/acsami.1c09269

Abstract

The interfacial issue resulting from surface trap states has become the crucial factor that limits the development of inverted perovskite solar cells (PSCs). Here, three unfused electronic acceptor-based polymers (PC-1-PC-3) with tailored alkyl groups were designed as interfacial materials to modify the interface contact between the perovskite active layer and electron transporting layer (ETL). Among them, PC-2 was found to extract interfacial charge faster and passivate trap states more efficiently. This leads to a remarkable increase in the short-circuit current density (22.49 mA cm^-2) and fill factor (0.821), as well as a maximum power conversion efficiency of 20.50% with a negligible hysteresis, which is superior to the PC-1/PC-3 based devices and reference device with only the ETL. This study provides an insight for future molecular design of efficient interfacial materials for inverted PSCs.

Keywords: interfacial modification; interlayer; perovskite solar cell; polymer acceptor; trap passivation.