Accession Number:

AD1105694

Title:

Suppressed Phase Separation of Mixed-Halide Perovskites Confined in Endotaxial Matrices

Descriptive Note:

Journal Article - Open Access

Corporate Author:

Florida State University Tallahassee United States

Personal Author(s):

• Wang,Xi
• Ling,Yichuan
• Lian,Xiujun
• Xin,Yan
• Dhungana,Kamal B.
• Perez-Orive,Fernando
• Knox,Javon
• Chen,Zhizhong
• Zhou,Yan
• Beery,Drake
• Hanson,Kenneth
• Shi,Jian
• Lin,Shangchao
• Gao,Hanwei

Report Date:

2019-02-11

Pagination or Media Count:

7.0

Abstract:

The functionality and performance of a semiconductor is determined by its bandgap. Alloying, as for instance in InxGa1-xN, has been a mainstream strategy for tuning the bandgap. Keeping the semiconductor alloys in the miscibility gap being homogeneous, however, is non-trivial. This challenge is now being extended to halide perovskites - an emerging class of photovoltaic materials. While the bandgap can be conveniently tuned by mixing different halogen ions, as in CsPbBrxI1-x3, the so-called mixed-halide perovskites suffer from severe phase separation under illumination. Here, we discover that such phase separation can be highly suppressed by embedding nanocrystals of mixed-halide perovskites in an endotaxial matrix. The tuned bandgap remains remarkably stable under extremely intensive illumination. The agreement between the experiments and a nucleation model suggests that the size of the nanocrystals and the host-guest interfaces are critical for the photo-stability. The stabilized bandgap will be essential for the development of perovskite-based optoelectronics, such as tandem solar cells and full-color LEDs.

Descriptors:

• perovskites
• halides
• optical properties
• optoelectronics
• band gaps
• semiconductors
• optoelectronics

Subject Categories:

• Geology, Geochemistry and Mineralogy
• Fiber Optics and Integrated Optics
• Geology, Geochemistry and Mineralogy
• Fiber Optics and Integrated Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE