Cu2SnS3 Nanocrystal-Based Hole-Transport Layer for Carbon Electrode-Based Perovskite Solar Cells

Integrating a suitable hole-transport layer into carbon electrode-based perovskite solar cells can effectively promote their power conversion efficiencies. Here, Cu2SnS3 nanocrystals are synthesized by the hot-injection method, and their potential to function as hole-transport layers in carbon electrode-based perovskite solar cells is evaluated for the first time. The Cu2SnS3 nanocrystal hole-transport layer can efficiently extract photogenerated holes from perovskite films and suppress charge carrier recombination. As a result, carbon electrode-based perovskite solar cells employing Cu2SnS3 hole-transport layers can demonstrate a maximum power conversion efficiency of 16.75%.