Highly-efficient heterojunction solar cells based on 2D Janus transition-metal nitride halide (TNH) monolayers with ultrahigh carrier mobility
Wanying Xie, Jiafei Pang, Jinni Yang, Xiao-Yu Kuang, Ai-Jie Mao
Abstract
). Heterojunctions formed by stacking two Janus TNH monolayers are further investigated for solar cell applications. Eight of the heterojunctions have type-II band alignments. Surprisingly, the OsNCl/FeNCl heterojunction has a power conversion efficiency (PCE) of 23.45%, which is a larger value compared to the PCE of GeSe/SnSe heterostructures (21.47%). The optical properties and the built-in electric field of the OsNCl/FeNCl heterojunction are investigated. These results indicate that the stable Janus TNH monolayers have potential applications in photoelectric devices, and the vertical heterojunctions can be used in solar cells.
Topics & Concepts
HeterojunctionMaterials scienceMonolayerJanusElectron mobilityOptoelectronicsSolar cellBand gapNanotechnology2D Materials and ApplicationsMXene and MAX Phase MaterialsPerovskite Materials and Applications