Solution‐Phase Epitaxial Growth of Perovskite Films on 2D Material Flakes for High‐Performance Solar Cells

• DOI: 10.1002/adma.201807689
• Publication Date: 2019-04-30T13:08:47Z
• Authors: Guanqi Tang; Peng You; Qidong Tai; Anneng Yang; Jiupeng Cao; Fangyuan Zheng; Zhiwen Zhou; Jiong Zhao; Paddy Kwok Leung ...; Feng Yan
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

The quality of perovskite films is critical to the performance solar cells. However, it challenging control crystallinity and orientation solution-processed films. Here, solution-phase van der Waals epitaxy growth MAPbI3 on MoS2 flakes reported. Under transmission electron microscopy, in-plane coupling between crystal lattices observed, leading with larger grain size, lower trap density, preferential along (110) normal surface. In cells, when active layers are grown coated hole-transport layers, power conversion efficiency substantially enhanced for 15%, relatively, due increased layer improved hole extraction transfer rate at interface. This work paves a way preparing high-performance cells other optoelectronic devices by introducing 2D materials as interfacial layers.