Improving the phase stability of inorganic lead halide perovskites through K/Rb doping. (1st May 2019)

• Record Type: Journal Article
• Authors: Wang, Si-Qin; Shen, Shiyu; Xue, Xiong-Xiong; He, Yunqiu; Xu, Zheng-Wei; Chen, Keqiu; Feng, Yexin
• Is Part Of: Applied physics express. Volume 12:Number 5(2019)
• Publication Date: 2019-05-01
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/1882-0786/ab1a55
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: All-inorganic perovskites have gained considerable significance. Despite their superior thermal robustness, poor phase stability has rendered inorganic perovskites adverse. Herein, on the basis of first-principles calculations, we find that the incorporation of rubidium (Rb) and potassium (K) in an appropriate ratio will stabilize CsPbI2 Br perovskites considerably, in which the cooperative interactions between Rb/K, I and Br play an important role. Besides, it is verified that 2D orthorhombic CsPbI3 with a thickness of ∼1 nm exhibits outstanding stability, even exceeding the non-perovskite, yellow structure and has a suitable band gap for solar cell applications.