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Jeong, Hu Young
UNIST Central Research Facilities (UCRF)
Research Interests
  • Soft material characterization such as graphene using a low kV Cs-corrected TEM
  • Insitu-TEM characterization of carbon-based materials using nanofactory STM holder for Li-ion battery application
  • Structural characterization of mesoporous materials using SEM & TEM
  • Interface analysis between various oxides and metals through Cs-corrected (S)TEM
  • Resistive switching mechanism of graphene oxide thin films for RRAM application

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Highly ordered lead-free double perovskite halides by design

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Title
Highly ordered lead-free double perovskite halides by design
Author
Ahn, Chang WonJo, Jae HunKim, Jong ChanUllah, HamidRyu, SangkyunHwang, YounghunChoi, Jin SanLee, JongminLee, SanghanJeen, HyoungjeenShin, Young-HanJeong, Hu YoungKim, Ill WonKim, Tae Heon
Issue Date
2020-12
Publisher
ELSEVIER
Citation
JOURNAL OF MATERIOMICS, v.6, no.4, pp.651 - 660
Abstract
Lead-free double perovskite halides are emerging optoelectronic materials that are alternatives to lead-based perovskite halides. Recently, single-crystalline double perovskite halides were synthesized, and their intriguing functional properties were demonstrated. Despite such pioneering works, lead-free double perovskite halides with better crystallinity are still in demand for applications to novel optoelectronic devices. Here, we realized highly crystalline Cs2AgBiBr6 single crystals with a well-defined atomic ordering on the microscopic scale. We avoided the formation of Ag vacancies and the subsequent secondary Cs3Bi2Br9 by manipulating the initial chemical environments in hydrothermal synthesis. The suppression of Ag vacancies allows us to reduce the trap density in the as-grown crystals and to enhance the carrier mobility further. Our design strategy is applicable for fabricating other lead-free halide materials with high crystallinity. (C) 2020 The Chinese Ceramic Society. Production and hosting by Elsevier B.V.
URI
https://scholarworks.unist.ac.kr/handle/201301/48258
URL
https://www.sciencedirect.com/science/article/pii/S2352847820301064
DOI
10.1016/j.jmat.2020.05.008
ISSN
2352-8478
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UCRF_Journal Papers
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