Suppressed phase separation of mixed-halide perovskites confined in endotaxial matrices

Xi Wang, Yichuan Ling, Xiujun Lian, Yan Xin, Kamal B. Dhungana, Fernando Perez-Orive, Javon Knox, Zhizhong Chen, Yan Zhou, Drake Beery, Kenneth Hanson, Jian Shi, Shangchao Lin and Hanwei Gao ()
Additional contact information
Xi Wang: Florida State University
Yichuan Ling: Florida State University
Xiujun Lian: Florida State University
Yan Xin: National High Magnetic Field Laboratory
Kamal B. Dhungana: Florida State University
Fernando Perez-Orive: Florida State University
Javon Knox: Florida State University
Zhizhong Chen: Rensselaer Polytechnic Institute
Yan Zhou: Florida State University
Drake Beery: Florida State University
Kenneth Hanson: Florida State University
Jian Shi: Rensselaer Polytechnic Institute
Shangchao Lin: Florida State University
Hanwei Gao: Florida State University

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: 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 CsPb(BrxI1-x)3, 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.

Date: 2019
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DOI: 10.1038/s41467-019-08610-6

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