Stable metal-halide perovskite-perovskite heterojunctions offer new opportunities for the design of solar cells and optoelectronics

Oct. 30, 2020 - A team of researchers led by Professor Russell Holmes and former CEMS Professor Eray Aydil (NYU) has succeeded in demonstrating stable heterojunctions between metal-halide perovskites and offered the first in-depth examination of interfacial mixing in these structures. The team consisted of graduate students Catherine Clark, John Bangsund, and Wan-Ju Hsu, as well as Dr. Jennifer Mann from IPRIME member company Physical Electronics Inc. (Chanhassen, MN). Metal-halide perovskites are a promising semiconductor for solar photoconversion and optoelectronics. Solar cells based on perovskites already rival commercially deployed technologies in terms of efficiency. Currently, perovskite devices rely on architectures that combine the perovskite active layer with adjacent organic or oxide layers. Alternative structures based on perovskite-perovskite heterojunctions have not been widely explored due mainly to ion diffusion and mixing across the interface. In this new work, researchers demonstrate that this challenge is not a general limitation and that perovskite-perovskite interfaces can be stable. This result opens up new opportunities for device design and engineering that could enhance the stability of existing devices while also enabling new devices that are otherwise inaccessible.

This work was supported by Ronald L. and Janet A. Christenson, the University of Minnesota (UMN) Institute on the Environment, the UMN Industrial Partnership for Research in Interfacial and Materials Engineering (IPRIME), UMN MnDRIVE, and the National Science Foundation through an iSuperseed grant to the UMN MRSEC (DMR-1420013).

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