Cation-Dependent Light-Induced Halide Demixing in Hybrid Organic–Inorganic Perovskites

Sutter-Fella, Carolin M.; Ngo, Quynh P.; Cefarin, Nicola; Gardner, Kira L.; Tamura, Nobumichi; Stan, Camelia V.; Drisdell, Walter S.; Javey, Ali; Toma, Francesca M.; Sharp, Ian D.

doi:10.1021/acs.nanolett.8b00541

Title: Cation-Dependent Light-Induced Halide Demixing in Hybrid Organic–Inorganic Perovskites

Journal Article · Mon Apr 30 00:00:00 EDT 2018 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.8b00541· OSTI ID:1439237

^[1]; Ngo, Quynh P. ^[2]; Cefarin, Nicola ^[3]; Gardner, Kira L. ^[4]; Tamura, Nobumichi ^[5];

^[5];

^[6]; Javey, Ali ^[2]; Toma, Francesca M. ^[7];

^[8]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division. Materials Sciences Division
Univ. of California, Berkeley, CA (United States). Electrical Engineering and Computer Sciences; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division; Univ. of Trieste (Italy). Dept. of Physics. Graduate School of Nanotechnology
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division. Joint Center for Artificial Photosynthesis
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division; Technical Univ. of Munich (Germany). Walter Schottky Inst. Physics Dept.

Mixed cation metal halide perovskites with increased power conversion efficiency, negligible hysteresis, and improved long-term stability under illumination, moisture, and thermal stressing have emerged as promising compounds for photovoltaic and optoelectronic applications. In this paper, we shed light on photoinduced halide demixing using in situ photoluminescence spectroscopy and in situ synchrotron X-ray diffraction (XRD) to directly compare the evolution of composition and phase changes in CH(NH₂)₂CsPb-halide (FACsPb-) and CH₃NH₃Pb-halide (MAPb-) perovskites upon illumination, thereby providing insights into why FACs-perovskites are less prone to halide demixing than MA-perovskites. We find that halide demixing occurs in both materials. However, the I-rich domains formed during demixing accumulate strain in FACsPb-perovskites but readily relax in MA-perovskites. The accumulated strain energy is expected to act as a stabilizing force against halide demixing and may explain the higher Br composition threshold for demixing to occur in FACsPb-halides. In addition, we find that while halide demixing leads to a quenching of the high-energy photoluminescence emission from MA-perovskites, the emission is enhanced from FACs-perovskites. This behavior points to a reduction of nonradiative recombination centers in FACs-perovskites arising from the demixing process and buildup of strain. FACsPb-halide perovskites exhibit excellent intrinsic material properties with photoluminescence quantum yields that are comparable to MA-perovskites. Finally, because improved stability is achieved without sacrificing electronic properties, these compositions are better candidates for photovoltaic applications, especially as wide bandgap absorbers in tandem cells.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); LBNL Laboratory Directed Research and Development (LDRD) Program; Swiss National Science Foundation (SNSF)

Grant/Contract Number:: AC02-05CH11231; SC0004993; P2EZP2_155586; P300P2_171420

OSTI ID:: 1439237

Journal Information:: Nano Letters, Vol. 18, Issue 6; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 56 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
cation variation
halide demixing
in situ characterization
metal halide perovskite
photoluminescence

Title: Cation-Dependent Light-Induced Halide Demixing in Hybrid Organic–Inorganic Perovskites

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