Quasi‐2D Bilayer Surface Passivation for High Efficiency Narrow Bandgap Perovskite Solar Cells

Abstract The combination of comprehensive surface passivation and effective interface carriers transfer plays a critical role in high‐performance perovskite solar cells. A 2D structure is an important approach for surface passivation of perovskite film, however, its large band gap could compromise carrier transfer. Herein, we synthesize a new molecule 2‐thiopheneethylamine thiocyanate (TEASCN) for the construction of bilayer quasi‐2D structure precisely on a tin‐lead mixed perovskite surface. This bilayer structure can passivate the perovskite surface and ensure effective carriers transfer simultaneously. As a result, the open‐circuit voltage ( V oc ) of the device is increased without sacrificing short‐circuit current density ( J sc ), giving rise to a high certified efficiency from a credible third‐party certification of narrow band gap perovskite solar cells. Furthermore, theoretical simulation indicates that the inclusion of TEASCN makes the bilayer structure thermodynamically more stable, which provides a strategy to tailor the number of layers of quasi‐2D perovskite structures.

Authors

Danni Yu; Qi Wei; Hansheng Li; Junhan Xie; Xianyuan Jiang; Ting Pan; Hao Wang; Mengling Pan; Wenjia Zhou; Weimin Liu; Philip C. Y. Chow; Zhijun Ning

Published

Mar 2, 2022

Journal or venue

Angewandte Chemie International Edition

DOI

10.1002/anie.202202346

Paper type

journal article

Source

Openalex