Halide Ion Migration in Perovskite Nanocrystals and Nanostructures

Kamat, Prashant V.; Kuno, Masaru

doi:10.1021/acs.accounts.0c00749

Halide Ion Migration in Perovskite Nanocrystals and Nanostructures

Journal Article · Thu Jan 21 00:00:00 EST 2021 · Accounts of Chemical Research

DOI:https://doi.org/10.1021/acs.accounts.0c00749· OSTI ID:1774775

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Univ. of Notre Dame, IN (United States). Notre Dame Radiation Lab.; University of Notre Dame
Univ. of Notre Dame, IN (United States). Notre Dame Radiation Lab.

The optical and electronic properties of metal halide perovskites provide insight into the operation of solar cells as well as their long-term operational stability. Halide mobility in perovskite films is an important factor influencing solar cell performance. One can visualize halide ion migration through halide exchange between two nanocrystal suspensions or between physically paired films of two different metal halide perovskites. The ability to tune band gap by varying halide ratios (Cl:Br or Br:I) allows the synthesis of mixed halide perovskites with tailored absorption and emission across the entire visible spectrum. Interestingly, mixed halide (e.g., MAPb(Br_0.5I_0.5)₃) films undergo phase segregation to form Br-rich and I-rich sites under steady state illumination. Upon halting illumination, segregated phases mix to restore original mixed halide compositions. Introducing multiple cations (Cs, formamidinium) at the A site or alloying with Cl greatly suppresses halide mobilities. Long-term irradiation of MAPb(Br_0.5I_0.5)₃ films also cause expulsion of iodide leaving behind Br-rich phases. Hole trapping at I-rich sites in MAPb(Br_0.5I_0.5)₃ is considered to be an important step in inducing halide mobility in photoirradiated films. Finally, this Account focuses on halide ion migration in nanocrystals and nanostructured films driven by entropy of mixing in dark and phase segregation under light irradiation.

View Accepted Manuscript (DOE)

Research Organization:: Univ. 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:: 1774775

Alternate ID(s):: OSTI ID: 1830790
OSTI ID: 1909222

Journal Information:: Accounts of Chemical Research, Journal Name: Accounts of Chemical Research Journal Issue: 3 Vol. 54; ISSN 0001-4842

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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