Tuning Emission and Electron–Phonon Coupling in Lead-Free Halide Double Perovskite Cs2AgBiCl6 under Pressure

Zhang, Long; Fang, Yuanyuan; Sui, Laizhi; Yan, Jiejuan; Wang, Kai; Yuan, Kaijun; Mao, Wendy L.; Zou, Bo

doi:10.1021/acsenergylett.9b02155

Title: Tuning Emission and Electron–Phonon Coupling in Lead-Free Halide Double Perovskite Cs₂AgBiCl₆ under Pressure

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Abstract

Lead-free halide double perovskites have been proposed as candidates to replace Pb-halide perovskites in photovoltaic and optoelectronic applications due to their enhanced stability and nontoxicity. However, the limited understanding of the fundamental properties of halide double perovskites represents a hurdle to further improvement of their device performance. Our experimental studies demonstrate that the broad emission of Cs₂AgBiCl₆ with a large Stokes shift stems primarily from exciton self-trapping owing to strong electron–phonon coupling. We report an unusual blue shift of the emission accompanied by a red shift of the absorption edge occurred due to the reduced lattice relaxation energy upon lattice compression in the cubic phase. Electron–phonon coupling reduction is critical to the enhancement of photoluminescence intensity and tuning emission range in Cs₂AgBiCl₆ under high pressure. The structure–property relationships illuminated by our work can provide the basis for improving the performance of halide double perovskites.

Authors:

Zhang, Long ^[1]; Fang, Yuanyuan ^[1]; Sui, Laizhi ^[2]; Yan, Jiejuan ^[3];

^[4];

^[2]; Mao, Wendy L. ^[5];

^[1]

Jilin Univ., Changchun (China). State Key Lab. of Superhard Materials
Chinese Academy of Sciences, Dalian (China)
Stanford Univ., CA (United States)
Jilin Univ., Changchun (China). State Key Lab. of Superhard Materials; Stanford Univ., CA (United States)
Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

Publication Date:: 2019-11-13

Research Org.:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)

OSTI Identifier:: 1595140

Grant/Contract Number:: AC02-76SF00515; 11774120; 21673100; 21725304

Resource Type:: Accepted Manuscript

Journal Name:: ACS Energy Letters

Additional Journal Information:: Journal Volume: 4; Journal Issue: 12; Journal ID: ISSN 2380-8195

Publisher:: American Chemical Society (ACS)

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Inorganic compounds; Lattices; Electrical conductivity; Perovskites; Halogens

Citation Formats


                    Zhang, Long, Fang, Yuanyuan, Sui, Laizhi, Yan, Jiejuan, Wang, Kai, Yuan, Kaijun, Mao, Wendy L., and Zou, Bo. Tuning Emission and Electron–Phonon Coupling in Lead-Free Halide Double Perovskite Cs2AgBiCl6 under Pressure.  United States: N. p., 2019. 
Web.  doi:10.1021/acsenergylett.9b02155.

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                    Zhang, Long, Fang, Yuanyuan, Sui, Laizhi, Yan, Jiejuan, Wang, Kai, Yuan, Kaijun, Mao, Wendy L., & Zou, Bo. Tuning Emission and Electron–Phonon Coupling in Lead-Free Halide Double Perovskite Cs2AgBiCl6 under Pressure.  United States.  https://doi.org/10.1021/acsenergylett.9b02155

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                    Zhang, Long, Fang, Yuanyuan, Sui, Laizhi, Yan, Jiejuan, Wang, Kai, Yuan, Kaijun, Mao, Wendy L., and Zou, Bo. Wed .  
"Tuning Emission and Electron–Phonon Coupling in Lead-Free Halide Double Perovskite Cs2AgBiCl6 under Pressure".  United States.  https://doi.org/10.1021/acsenergylett.9b02155.  https://www.osti.gov/servlets/purl/1595140.

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@article{osti_1595140,

  title        = {Tuning Emission and Electron–Phonon Coupling in Lead-Free Halide Double Perovskite Cs2AgBiCl6 under Pressure},

  author       = {Zhang, Long and Fang, Yuanyuan and Sui, Laizhi and Yan, Jiejuan and Wang, Kai and Yuan, Kaijun and Mao, Wendy L. and Zou, Bo},

  abstractNote = {Lead-free halide double perovskites have been proposed as candidates to replace Pb-halide perovskites in photovoltaic and optoelectronic applications due to their enhanced stability and nontoxicity. However, the limited understanding of the fundamental properties of halide double perovskites represents a hurdle to further improvement of their device performance. Our experimental studies demonstrate that the broad emission of Cs2AgBiCl6 with a large Stokes shift stems primarily from exciton self-trapping owing to strong electron–phonon coupling. We report an unusual blue shift of the emission accompanied by a red shift of the absorption edge occurred due to the reduced lattice relaxation energy upon lattice compression in the cubic phase. Electron–phonon coupling reduction is critical to the enhancement of photoluminescence intensity and tuning emission range in Cs2AgBiCl6 under high pressure. The structure–property relationships illuminated by our work can provide the basis for improving the performance of halide double perovskites.},

  doi          = {10.1021/acsenergylett.9b02155},

  journal      = {ACS Energy Letters},

  number       = 12,

  volume       = 4,

  place        = {United States},

  year         = {2019},

  month        = {11}

}

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Title: Tuning Emission and Electron–Phonon Coupling in Lead-Free Halide Double Perovskite Cs2AgBiCl6 under Pressure

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Title: Tuning Emission and Electron–Phonon Coupling in Lead-Free Halide Double Perovskite Cs₂AgBiCl₆ under Pressure