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 · 22 December 2017 · ACS Energy Letters

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

Brennan, Michael C. ^[1]; Draguta, Sergiu ^[1];

^[1];

^[1]

Univ. of Notre Dame, Notre Dame, IN (United States)

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:: SC0014334; FC02-04ER15533

OSTI ID:: 1415052

Alternate ID(s):: OSTI ID: 1490041

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

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 388 works

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Strain engineering in perovskite solar cells and its impacts on carrier dynamics Zhu, Cheng; Niu, Xiuxiu; Fu, Yuhao Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-08507-4	journal	February 2019
Suppressed phase separation of mixed-halide perovskites confined in endotaxial matrices Wang, Xi; Ling, Yichuan; Lian, Xiujun Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-08610-6	journal	February 2019
Phase segregation due to ion migration in all-inorganic mixed-halide perovskite nanocrystals Zhang, Huichao; Fu, Xu; Tang, Ying Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-09047-7	journal	March 2019
Absolute energy level positions in tin- and lead-based halide perovskites Tao, Shuxia; Schmidt, Ines; Brocks, Geert Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-10468-7	journal	June 2019
Effect of energy transfer on the optical properties of surface-passivated perovskite films with CdSe/ZnS quantum dots Cho, Il-Wook; Ryu, Mee-Yi Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-54860-1	journal	December 2019