Dopant-Free π-Conjugated Hole Transport Materials for Highly Stable and Efficient Perovskite Solar Cells

Zhifeng Deng; Shuaiwei Cui; Kaichang Kou; Dongxu Liang; Xin Shi; Jinhui Liu

doi:10.3389/fchem.2021.664504

Dopant-Free π-Conjugated Hole Transport Materials for Highly Stable and Efficient Perovskite Solar Cells

Front Chem. 2021 Mar 18:9:664504. doi: 10.3389/fchem.2021.664504. eCollection 2021.

Authors

Zhifeng Deng^{1

2}, Shuaiwei Cui³, Kaichang Kou¹, Dongxu Liang³, Xin Shi², Jinhui Liu³

Affiliations

¹ School of Chemistry and Chemical Engineering, Northwestern Polytechnical University (NWPU), Xi'an, China.
² National and Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology, School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong, China.
³ Key Laboratory of Rubber-Plastic of Ministry of Education (QUST), School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, China.

Abstract

Current high-efficiency hybrid perovskite solar cells (PSCs) have been fabricated with doped hole transfer material (HTM), which has shown short-term stability. Doping applied in HTMs for PSCs can enhance the hole mobility and PSCs' power conversion efficiency, while the stability of PSCs will be significantly decreased due to inherent hygroscopic properties and chemical incompatibility. Development of dopant-free HTM with high hole mobility is a challenge and of utmost importance. In this review, a series of selected and typical π-conjugated dopant-free hole transport materials, mainly regarding small molecules, are reviewed, which could consequently help to further design high-performance dopant-free HTMs. In addition, an outline of the molecular design concept and also the perspective of ideal dopant-free HTMs were explored.

Keywords: dopant-free; hole transfer material; molecular design; perovskite solar cells; π-conjugated materials.

Publication types

Review