A Spirobixanthene-Based Dendrimeric Hole-Transporting Material for Perovskite Solar Cells

摘要

A dendrimer based on a spirobixanthene core, termed DH1, is designed andsynthesized as a hole-transporting material (HTM) for perovskite solar cells(PSCs). DH1 showing a hyperbranched structure with methoxydiphenylaminecarbazole dendrons stretching outward along the para-phenylene spacer acquiresa large molecular size of up to 1.9 nm, which favors good thermal stability andamorphous property. The thus obtained DH1-based pinhole-free film as a holetransportlayer results in a power conversion efficiency of 17.13% and reducedhysteresis behavior of MAPbI3-based planar PSCs. This work provides the firstexample of the use of dendrimer-type HTM for PSC application, demonstrating apromising approach to design HTMs in a quasiglobular dendrimer with a largemolecular size.