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Kwak, Sang Kyu
Kyu’s MolSim Lab @ UNIST
Research Interests
  • Molecular modeling and simulation, statistical thermodynamics, molecular physics

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Perovskite Granular Wire Photodetectors with Ultrahigh Photodetectivity

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Title
Perovskite Granular Wire Photodetectors with Ultrahigh Photodetectivity
Author
Lee, Yoon HoSong, InhoKim, Su HwanPark, Ju HyunPark, Sung O.Lee, Jeong HunWon, YousangCho, KilwonKwak, Sang KyuOh, Joon Hak
Issue Date
2020-06
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, pp.2002357
Abstract
Control over the morphology and crystallinity of metal halide perovskite materials is of key importance to enable high-performance optoelectronics. Here, a simple yet effective template-free self-assembly synthesis of perovskite granular wires with ultrahigh photodetectivity (3.17 x 10(15)Jones) is reported. The 1D self-assembly of perovskite grains is driven by differences in the surface interaction energies of the granular facets. The superb photodetecting performance originates from extremely low dark current engendered by energetic barriers featuring unique band-edge modulation along the long axis of wire. Flexible photodetector arrays, fabricated by selectively placing perovskite granular wires onto pre-patterned electrode arrays on a transparent polymer substrate, show independently addressable photonic signal mapping with remarkably high detectivity, photoconductive gain, and responsivity. The "self-assembled nanograin engineering" strategy developed in this study provides a viable method for the development of high-performance perovskite photodetectors and can be extended to other integrated optoelectronic systems.
URI
https://scholarworks.unist.ac.kr/handle/201301/47582
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/adma.202002357
DOI
10.1002/adma.202002357
ISSN
0935-9648
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