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Choi, Kyoung Jin
Energy Conversion Materials (EcoMAT) Lab
Research Interests
  • Solar cells, thermoelectrics, piezoelectric

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Flexibility of Semitransparent Perovskite Light-Emitting Diodes Investigated by Tensile Properties of the Perovskite Layer

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Title
Flexibility of Semitransparent Perovskite Light-Emitting Diodes Investigated by Tensile Properties of the Perovskite Layer
Author
Lee, Sang YunKim, Si-HoonNam, Yun SeokYu, Jae ChoulLee, SeungjinKim, Da BinJung, Eui DaeWoo, Jeong-HyunAhn, Seung-minLee, SukbinChoi, Kyoung JinKim, Ju-YoungSong, Myoung Hoon
Issue Date
2019-01
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.19, no.2, pp.971 - 976
Abstract
Organic-inorganic hybrid perovskites have been investigated extensively for use in perovskite-based solar cells and light-emitting diodes (LEDs) because of their excellent electrical and optical properties. Although the flexibility of perovskite LEDs has been studied through empirical methods such as cyclic bending tests, the flexibility of the perovskite layer has not been investigated systemically. Here, flexible and semitransparent perovskite LEDs are fabricated: a PEDOT:PSS anode and Ag nanowire cathode allow for flexible and semitransparent devices, while the use of a conjugated polyelectrolyte as an interfacial layer reduces the electron injection barrier between the cathode and the electron transport layer (SPW-111), resulting in enhanced device efficiency. Cyclic bending tests performed on the electrodes and in situ hole-nanoindentation tests performed on the constituent materials suggest that mechanical failure occurs in the perovskite MAPbBr3 layer during cyclic bending, leading to a decrease in the luminance. Tensile properties of the MAPbBr3 layer explain the critical bending radius (rb) of the perovskite LEDs on the order of 1 mm.
URI
https://scholarworks.unist.ac.kr/handle/201301/25825
URL
https://pubs.acs.org/doi/10.1021/acs.nanolett.8b04200
DOI
10.1021/acs.nanolett.8b04200
ISSN
1530-6984
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