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Song, Myoung Hoon
Organic Photonics & Optoelectronics Lab
Research Interests
  • Organic optoelectrics, perovskite light-emitting diodes, surface treatment, photonic crystals

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Nanomechanical Approach for Flexibility of Organic-Inorganic Hybrid Perovskite Solar Cells

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Title
Nanomechanical Approach for Flexibility of Organic-Inorganic Hybrid Perovskite Solar Cells
Author
Ahn, Seung-minJung, Eui DaeKim, Si-HoonKim, HangeulLee, SukbinSong, Myoung HoonKim, Ju-Young
Issue Date
2019-06
Publisher
American Chemical Society
Citation
NANO LETTERS, v.19, no.6, pp.3707 - 3715
Abstract
The mechanical flexibility of perovskite solar cells as well as high power conversion efficiency is attracting increasing attention. In addition to existing empirical approaches, such as cyclic bending tests, in this study we report the tensile properties of the perovskite materials themselves. Measuring the tensile properties of free-standing perovskite materials is critical because (1) tensile properties represent the realistic mechanical properties of the film-type perovskite layer in the solar cells including the effects of various defects, and (2) deformation behavior of the perovskite layer at any deformed state of the solar cells can be analyzed using solid mechanics with the tensile properties as input. Critical bending radius of MAPbI3-based flexible solar cells is found to be between 0.5 and 1.0 mm by the decrease in power conversion efficiency during cyclic bending deformation. This finding agrees well with the critical bending radius of 0.66 mm determined based on the elastic deformation limit of 1.17% for MAPbI3 found by in situ tensile testing. Scanning electron microscopy observations and hole-nanoindentation tests suggest that the formation of coarse cracks in the perovskite layers is the primary cause of the decrease in power conversion efficiency observed in flexible perovskite solar cells. © 2019 American Chemical Society.
URI
https://scholarworks.unist.ac.kr/handle/201301/27029
URL
https://pubs.acs.org/doi/10.1021/acs.nanolett.9b00796
DOI
10.1021/acs.nanolett.9b00796
ISSN
1530-6984
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