Shift Happens . How Halide Ion Defects Influence Photoinduced Segregation in Mixed Halide Perovskites

Yoon, Seog Joon; Kuno, Masaru; Kamat, Prashant V.

doi:10.1021/acsenergylett.7b00357

Title: Shift Happens . How Halide Ion Defects Influence Photoinduced Segregation in Mixed Halide Perovskites

Journal Article · Thu Jun 01 00:00:00 EDT 2017 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.7b00357· OSTI ID:1361221

Yoon, Seog Joon ^[1];

^[2];

^[1]

Univ. of Notre Dame, IN (United States). Radiation Lab. and Dept. of Chemistry and Biochemistry
Univ. of Notre Dame, IN (United States). Dept. of Chemistry and Biochemistry

Minimizing photoinduced segregation in mixed halide lead perovskites is important for achieving stable photovoltaic performance. The shift in the absorption and the rate of formation of iodide- and bromide-rich regions following visible excitation of mixed halide lead perovskites is found to strongly depend on the halide ion concentration. Slower formation and recovery rates observed in halide-deficient films indicate the involvement of defect sites in influencing halide phase segregation. At higher halide concentrations (in stoichiometric excess), segregation effects become less prominent, as evidenced by faster recovery kinetics. These results suggest that light-induced compositional segregation can be minimized in mixed halide perovskite films by using excess halide ions. The findings from this study further reflect the importance of halide ion post-treatment of perovskite films to improve their solar cell performance.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

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

OSTI ID:: 1361221

Alternate ID(s):: OSTI ID: 1427172; OSTI ID: 1508314

Journal Information:: ACS Energy Letters, Journal Name: ACS Energy Letters Vol. 2 Journal Issue: 7; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 226 works

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