Light-Induced Anion Phase Segregation in Mixed Halide Perovskites

Brennan, Michael C.; Draguta, Sergiu; Kamat, Prashant V.; Kuno, Masaru

doi:10.1021/acsenergylett.7b01151

Title: Light-Induced Anion Phase Segregation in Mixed Halide Perovskites

Journal Article · Fri Dec 22 00:00:00 EST 2017 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.7b01151· OSTI ID:1415052

Brennan, Michael C.; Draguta, Sergiu;

;

Hybrid lead halide perovskites such as MAPbI₃ (MA = CH₃NH₃⁺) and their mixed halide analogues represent an emerging class of materials for solar energy conversion. Intriguing aspects include sizable carrier diffusion lengths, large optical absorption coefficients, and certified power conversion efficiencies that now exceed 22%. Halide-composition-tunable band gaps also make MAPb(I_1–xBr_x)₃ systems ideal candidates for tandem solar cells. Unfortunately, preventing the effective integration of MAPb(I_1–xBr_x)₃ into working devices are intrinsic instabilities due to light-induced halide phase segregation. Namely, under illumination, mixed halide perovskites reversibly segregate into low-band-gap I-rich and high-band-gap Br-rich domains. Under electrical bias, halide migration has also been proposed as the source of undesirable charge injection barriers that degrade photovoltaic performance. In this Perspective, we review the origin of light-induced halide phase segregation, its effects on photovoltaic response, and ongoing research to suppress its influence on the optical and electronic response of mixed halide perovskites.

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Research Organization:: University of Notre Dame, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FC02-04ER15533; SC0014334

OSTI ID:: 1415052

Alternate ID(s):: OSTI ID: 1490041

Journal Information:: ACS Energy Letters, Journal Name: ACS Energy Letters Vol. 3 Journal Issue: 1; ISSN 2380-8195

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 339 works

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