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Lee, Sukbin
Multidimensional Structural Materials Lab.
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Nanomechanical Approach for Flexibility of Organic-Inorganic Hybrid Perovskite Solar Cells

Ahn, Seung-minJung, Eui DaeKim, Si-HoonKim, HangeulLee, SukbinSong, Myoung HoonKim, Ju-Young
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NANO LETTERS, v.19, no.6, pp.3707 - 3715
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.
American Chemical Society
Keyword (Author)
critical bending radiuselastic deformation limitflexibilityin situ tensile testingPerovskite solar cells
Scanning electron microscopyTensile propertiesTensile testingWell testingCritical bendingflexibilityHigh power conversionIn-situ tensile testingMechanical flexibilityNanoindentation testsOrganic-inorganic hybridPower conversion efficienciesSolar cellsBending (deformation)Bending testsBiomechanicsConversion efficiencyCyclic loadsDegrees of freedom (mechanics)EfficiencyElastic deformationMaterials testing apparatusMechanical propertiesNanostructured materialsorganic-inorganic materialsPerovskitePerovskite solar cells


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