Bidirectional Halide Ion Exchange in Paired Lead Halide Perovskite Films with Thermal Activation

Tor Elmelund, Rebecca A. Scheidt, Brian Seger, Prashant V. Kamat*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

MAPbBr3 and MAPbI3 films cast onto glassslides and physically paired together undergo halide exchange to formmixed halide films. The change in halide composition in these two∼130 nm thick films occurs concurrently with Br– diffusing toward the MAPbI3 film and I– diffusing toward the MAPbBr3 film. The diffusion of thesehalide species, which is tracked through changes in the absorption,offers a direct measurement of thermally activated halide diffusionin perovskite films. The increase in the rate constant of halide diffusionwith increasing temperature (from 8.3 × 10–6 s–1 at 23 °C to 3.7 × 10–4 s–1 at 140 °C) follows an Arrhenius relationshipwith activation energy of 51 kJ/mol. The thermally activated halideexchange shows the challenges of employing layers of different metalhalide perovskites in stable tandem solar cells.
Original languageEnglish
JournalACS Energy Letters
Volume4
Issue number8
Pages (from-to)1961-1969
Number of pages9
DOIs
Publication statusPublished - 2019

Cite this

Elmelund, Tor ; Scheidt, Rebecca A. ; Seger, Brian ; Kamat, Prashant V. / Bidirectional Halide Ion Exchange in Paired Lead Halide Perovskite Films with Thermal Activation. In: ACS Energy Letters. 2019 ; Vol. 4, No. 8. pp. 1961-1969.
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title = "Bidirectional Halide Ion Exchange in Paired Lead Halide Perovskite Films with Thermal Activation",
abstract = "MAPbBr3 and MAPbI3 films cast onto glassslides and physically paired together undergo halide exchange to formmixed halide films. The change in halide composition in these two∼130 nm thick films occurs concurrently with Br– diffusing toward the MAPbI3 film and I– diffusing toward the MAPbBr3 film. The diffusion of thesehalide species, which is tracked through changes in the absorption,offers a direct measurement of thermally activated halide diffusionin perovskite films. The increase in the rate constant of halide diffusionwith increasing temperature (from 8.3 × 10–6 s–1 at 23 °C to 3.7 × 10–4 s–1 at 140 °C) follows an Arrhenius relationshipwith activation energy of 51 kJ/mol. The thermally activated halideexchange shows the challenges of employing layers of different metalhalide perovskites in stable tandem solar cells.",
author = "Tor Elmelund and Scheidt, {Rebecca A.} and Brian Seger and Kamat, {Prashant V.}",
year = "2019",
doi = "10.1021/acsenergylett.9b01280",
language = "English",
volume = "4",
pages = "1961--1969",
journal = "ACS Energy Letters",
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publisher = "American Chemical Society",
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Bidirectional Halide Ion Exchange in Paired Lead Halide Perovskite Films with Thermal Activation. / Elmelund, Tor; Scheidt, Rebecca A.; Seger, Brian; Kamat, Prashant V.

In: ACS Energy Letters, Vol. 4, No. 8, 2019, p. 1961-1969.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Bidirectional Halide Ion Exchange in Paired Lead Halide Perovskite Films with Thermal Activation

AU - Elmelund, Tor

AU - Scheidt, Rebecca A.

AU - Seger, Brian

AU - Kamat, Prashant V.

PY - 2019

Y1 - 2019

N2 - MAPbBr3 and MAPbI3 films cast onto glassslides and physically paired together undergo halide exchange to formmixed halide films. The change in halide composition in these two∼130 nm thick films occurs concurrently with Br– diffusing toward the MAPbI3 film and I– diffusing toward the MAPbBr3 film. The diffusion of thesehalide species, which is tracked through changes in the absorption,offers a direct measurement of thermally activated halide diffusionin perovskite films. The increase in the rate constant of halide diffusionwith increasing temperature (from 8.3 × 10–6 s–1 at 23 °C to 3.7 × 10–4 s–1 at 140 °C) follows an Arrhenius relationshipwith activation energy of 51 kJ/mol. The thermally activated halideexchange shows the challenges of employing layers of different metalhalide perovskites in stable tandem solar cells.

AB - MAPbBr3 and MAPbI3 films cast onto glassslides and physically paired together undergo halide exchange to formmixed halide films. The change in halide composition in these two∼130 nm thick films occurs concurrently with Br– diffusing toward the MAPbI3 film and I– diffusing toward the MAPbBr3 film. The diffusion of thesehalide species, which is tracked through changes in the absorption,offers a direct measurement of thermally activated halide diffusionin perovskite films. The increase in the rate constant of halide diffusionwith increasing temperature (from 8.3 × 10–6 s–1 at 23 °C to 3.7 × 10–4 s–1 at 140 °C) follows an Arrhenius relationshipwith activation energy of 51 kJ/mol. The thermally activated halideexchange shows the challenges of employing layers of different metalhalide perovskites in stable tandem solar cells.

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DO - 10.1021/acsenergylett.9b01280

M3 - Journal article

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SP - 1961

EP - 1969

JO - ACS Energy Letters

JF - ACS Energy Letters

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