空位缺陷
卤化物
八面体
钙钛矿(结构)
纳米晶
离子键合
材料科学
相(物质)
从头算
结晶学
化学物理
兴奋剂
化学
纳米技术
离子
无机化学
晶体结构
光电子学
有机化学
作者
Yun Hyok Kye,Chol Jun Yu,Un-Gi Jong,Kum Chol Ri,Jin Song Kim,Song Hyok Choe,Sukwon Hong,Shuzhou Li,Jacob N. Wilson,Aron Walsh
标识
DOI:10.1021/acs.jpcc.9b01552
摘要
The inorganic halide perovskite CsPbI3 has shown great promise for efficient solar cells, but the instability of its cubic phase remains a major challenge. We present a route for stabilizing the cubic α-phase of CsPbI3 through the control of vacancy defects. Analysis of the ionic chemical potentials is performed within an ab initio thermodynamic formalism, including the effect of solution. It is found that cation vacancies lead to weakening of the interaction between Cs and PbI6 octahedra in CsPbI3, with a decrease in the energy difference between the α- and δ-phases. Under I-rich growth conditions, which can be realized experimentally, we predict that the formation of cation vacancies can be controlled. Other synthetic strategies for cubic-phase stabilization include the growth of nanocrystals, surface capping ligands containing reductive functional groups, and extrinsic doping. Our analysis reveals mechanisms for polymorph stabilization that open a new pathway for structural control of halide perovskites.
科研通智能强力驱动
Strongly Powered by AbleSci AI