Enhanced Crystallinity of Triple-Cation Perovskite Film via Doping NH4SCN

• Published in: Nanoscale research letters Vol. 14; no. 1; pp. 1 - 7
• Main Authors: Liu, Ziji, Liu, Detao, Chen, Hao, Ji, Long, Zheng, Hualin, Gu, Yiding, Wang, Feng, Chen, Zhi, Li, Shibin
• Format: Journal Article
• Language: English
• Published: New York Springer US 02-09-2019; Springer Nature B.V; SpringerOpen
• Subjects: Chemistry and Materials Science; Crystalline; Crystals; Density; Energy conversion efficiency; Grain size; Materials Science; Metal halide perovskite materials and devices; Molecular Medicine; Nano Express; Nanochemistry; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; NH4SCN; Optoelectronic devices; Particle size; Perovskite solar cells; Perovskites; Photovoltaic cells; Photovoltaics; Solar cells; Trap-state density; NH; Crystalline; Perovskite solar cells; Trap-state density; SCN
• ISSN: 1931-7573; 1556-276X
• DOI: 10.1186/s11671-019-3134-4

The trap-state density in perovskite films largely determines the photovoltaic performance of perovskite solar cells (PSCs). Increasing the crystal grain size in perovskite films is an effective method to reduce the trap-state density. Here, we have added NH
4
SCN into perovskite precursor solution to obtain perovskite films with an increased crystal grain size. The perovskite with increased crystal grain size shows a much lower trap-state density compared with reference perovskite films, resulting in an improved photovoltaic performance in PSCs. The champion photovoltaic device has achieved a power conversion efficiency of 19.36%. The proposed method may also impact other optoelectronic devices based on perovskite films.