Iodine (I) Expulsion at Photoirradiated Mixed Halide Perovskite Interface. Should I Stay or Should I Go?

Mathew, Preethi Susan; Samu, Gergely F.; Janáky, Csaba; Kamat, Prashant V.

doi:10.1021/acsenergylett.0c00925

Iodine (I) Expulsion at Photoirradiated Mixed Halide Perovskite Interface. Should I Stay or Should I Go?

Journal Article · Mon May 11 00:00:00 EDT 2020 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.0c00925· OSTI ID:1799650

Mathew, Preethi Susan ^[1]; ^[2]; ^[2]; ^[3]

University of Notre Dame, IN (United States); OSTI
University of Szeged, Szeged (Hungary); ELI-ALPS Research Institute, Szeged (Hungary)
University of Notre Dame, IN (United States)

Visible light irradiation of the mixed halide perovskite film in contact with a solvent (dichloromethane, DCM) in which the film otherwise is stable, leads to selective expulsion of iodide (I) from the film with concurrent shift in the band edge to lower wavelengths. Here we have now employed mixed halide perovskites to uncover the influence of A-site cation (Methyl ammonium, MA and Cesium, Cs) on the mobility of iodide ions under photoirradiation. In the absence of solvent contact, the mixed halide perovskite films undergo photoinduced segregation with a rate constant that decreases with increasing Cs content. Interestingly, the iodide expulsion rate in DCM is strongly dependent on the rate of photoinduced segregation. At Cs atomic concentrations higher than 50%, the films become stable as the iodide expulsion is largely suppressed. The role of A-site cation in dictating the mobility of halide ions is discussed.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: European Regional Development NDRL Fund; European Research Council (ERC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

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

OSTI ID:: 1799650

Journal Information:: ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 6 Vol. 5; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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