Accession Number:

AD1105694

Title:

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

Personal Author(s):

Corporate Author:

Florida State University Tallahassee United States

Report Date:

2019-02-11

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.

Descriptive Note:

Journal Article - Open Access

Supplementary Note:

Nature Communications, 10, 695, 01 Jan 0001, 01 Jan 0001,

Pages:

0007

Descriptors:

Subject Categories:

Communities Of Interest:

Modernization Areas:

Distribution Statement:

Approved For Public Release;

File Size:

1.77MB

View The Document