Improving Efficiency and Reproducibility of Perovskite Solar Cells through Aggregation Control in Polyelectrolytes Hole Transport Layer

Xiaodong Li; Ying-Chiao Wang; Liping Zhu; Wenjun Zhang; Hai-Qiao Wang; Junfeng Fang

doi:10.1021/acsami.7b11977

Improving Efficiency and Reproducibility of Perovskite Solar Cells through Aggregation Control in Polyelectrolytes Hole Transport Layer

ACS Appl Mater Interfaces. 2017 Sep 20;9(37):31357-31361. doi: 10.1021/acsami.7b11977. Epub 2017 Sep 8.

Authors

Xiaodong Li¹, Ying-Chiao Wang¹, Liping Zhu¹, Wenjun Zhang^{1

2}, Hai-Qiao Wang^{1

2}, Junfeng Fang^{1

2}

Affiliations

¹ Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences , Ningbo 315201, China.
² University of Chinese Academy of Sciences , Beijing 100049, China.

PMID: 28879759
DOI: 10.1021/acsami.7b11977

Abstract

Here, we report that the performance of perovskite solar cells (PSCs) can be improved by aggregation control in polyelectrolytes interlayer. Through counterions tailoring and solvent optimization, the strong aggregation of polyelectrolytes P3CT-Na can be broken up by P3CT-CH₃NH₂. When using P3CT-CH₃NH₂ to replace P3CT-Na as hole transport layer, the average efficiency is greatly improved from 16.9 to 18.9% (highest 19.6%). Importantly, efficiency over 15% is obtained in 1 cm² devices with P3CT-CH₃NH₂, ∼50% higher than that with P3CT-Na (10.3%). Our work demonstrates the important role of aggregation control in polyelectrolytes interlayer, providing new opportunities to promote its application in PSCs.

Keywords: aggregation control; counterions; hole transport layer; perovskite solar cells; polyelectrolytes.