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Cakan DN, Dolan CJ, Oberholtz E, Kodur M, Palmer JR, Vossler HM, Luo Y, Kumar RE, Zhou T, Cai Z, Lai B, Holt MV, Dunfield SP, Fenning DP. Cl alloying improves thermal stability and increases luminescence in iodine-rich inorganic perovskites. RSC Adv 2024; 14:21065-21074. [PMID: 38989033 PMCID: PMC11235055 DOI: 10.1039/d4ra04348k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2024] [Accepted: 06/14/2024] [Indexed: 07/12/2024] Open
Abstract
The inorganic perovskite CsPbI3 shows promising photophysical properties for a range of potential optoelectronic applications but is metastable at room temperature. To address this, Br can be alloyed into the X-site to create compositions such as CsPbI2Br that are stable at room temperature but have bandgaps >1.9 eV - severely limiting solar applications. Herein, in an effort to achieve phase stable films with bandgaps <1.85 eV, we investigate alloying chlorine into iodine-rich triple-halide CsPb(I0.8Br0.2-x Cl x )3 with 0 < x < 0.1. We show that partial substitution of iodine with bromine and chlorine provides a path to maintain broadband terrestrial absorption while improving upon the perovskite phase stability due to chlorine's smaller size and larger ionization potential than bromine. At moderate Cl loading up to ≈5%, X-ray diffraction reveals an increasingly smaller orthorhombic unit cell, suggesting chlorine incorporation into the lattice. Most notably, this Cl incorporation is accompanied by a significant enhancement over Cl-free controls in the duration of black-phase stability of up to 7× at elevated temperatures. Additionally, we observe up to 5× increased steady state photoluminescence intensity (PL), along with a small blue-shift. In contrast, at high loading (≈10%), Cl accumulates in a second phase that is visible at grain boundaries via synchrotron fluorescence microscopy and negatively impacts the perovskite phase stability. Thus, replacing small fractions of bromine for chlorine in the iodine-rich inorganic perovskite lattice results in distinct improvement thermal stability and optoelectronic quality while minimally impacting the bandgap.
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Affiliation(s)
- Deniz N Cakan
- Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California La Jolla San Diego California 92093 USA
| | - Connor J Dolan
- Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California La Jolla San Diego California 92093 USA
| | - Eric Oberholtz
- Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California La Jolla San Diego California 92093 USA
| | - Moses Kodur
- Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California La Jolla San Diego California 92093 USA
| | - Jack R Palmer
- Materials Science and Engineering Program, University of California La Jolla San Diego California 92093 USA
| | - Hendrik M Vossler
- Materials Science and Engineering Program, University of California La Jolla San Diego California 92093 USA
| | - Yanqi Luo
- Advanced Photon Source, Argonne National Laboratory Lemont IL 60439 USA
| | - Rishi E Kumar
- Materials Science and Engineering Program, University of California La Jolla San Diego California 92093 USA
| | - Tao Zhou
- Center for Nanoscale Materials, Argonne National Laboratory Lemont IL 60439 USA
| | - Zhonghou Cai
- Advanced Photon Source, Argonne National Laboratory Lemont IL 60439 USA
| | - Barry Lai
- Advanced Photon Source, Argonne National Laboratory Lemont IL 60439 USA
| | - Martin V Holt
- Center for Nanoscale Materials, Argonne National Laboratory Lemont IL 60439 USA
| | - Sean P Dunfield
- Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California La Jolla San Diego California 92093 USA
| | - David P Fenning
- Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California La Jolla San Diego California 92093 USA
- Materials Science and Engineering Program, University of California La Jolla San Diego California 92093 USA
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Ma X, Zhou J, Liu Y, Xu S, Cao S. Supramolecular Framework Constructed by Dendritic Nanopolymer for Stable Flexible Perovskite Resistive Random-Access Memory. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2206852. [PMID: 36526587 DOI: 10.1002/smll.202206852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 11/30/2022] [Indexed: 06/17/2023]
Abstract
The 3D supramolecular framework (3D-SF) is constructed in this work through the hydrogen bond assisted self-assembly of spherical dendritic nanopolymer to regulate the flexibility, stability, and resistive switching (RS) performance of perovskite resistive random-access memory (RRAM). Herein, the 3D-SF network acts as the perovskite crystallization template to regulate the perovskite crystallization process due to its coordination interaction of functional groups with the perovskite grains, presenting the uniform, pinhole-free, and compact perovskite morphology for stable flexible RRAM. The 3D-SF network in situ stays at the perovskite intergranular boundaries to crosslink the perovskite grains. The RS performance of 3D-SF-modified perovskite RRAM device is evidently improved to the ON/OFF ratio of 105 , the cycle number of 500 times, and the data retention time of 104 s. The 50-days exposure of unencapsulated RRAM device at ambient environment still makes the ON/OFF ratio to be kept at ≈104 , indicating the potential of long-term stable multilevel storage in the high-density data storage. The bending action under different radius also does not change the RS performance due to the excellent bending-resistant ability of 3D-SF-modified perovskite film. This work explores a novel polymer additive strategy to construct the 3D supramolecular framework for stable flexible perovskite optoelectronic devices.
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Affiliation(s)
- Xueqing Ma
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China
- Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Jianjun Zhou
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China
- Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Yingliang Liu
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China
- Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Shengang Xu
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China
- Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou, 450001, P. R. China
| | - Shaokui Cao
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China
- Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou, 450001, P. R. China
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Yu F, Liu J, Xu P, Huang J, Li CH, Zheng YX. High-quality all-inorganic CsPbI2Br thin films derived from phase-pure intermediate for efficient wide-bandgap perovskite solar cells. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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