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Solution-processed"silver-bismuth-iodine" ternary thin films for lead-free photovoltaic absorbers

Title
Solution-processed"silver-bismuth-iodine" ternary thin films for lead-free photovoltaic absorbers
Authors
Oh, Jae TaekKim, Dae-HwanKim, Younghoon
DGIST Authors
Kim, Dae-HwanKim, Younghoon
Issue Date
2018-09
Citation
Journal of Visualized Experiments, 2018(139)
Type
Article
Article Type
Article
ISSN
1940-087X
Abstract
Bismuth-based hybrid perovskites are regarded as promising photo-active semiconductors for environment-friendly and air-stable solar cell applications. However, poor surface morphologies and relatively high bandgap energies have limited their potential. Silver-bismuth-iodine (Ag-Bi-I) is a promising semiconductor for optoelectronic devices. Therefore, we demonstrate the fabrication of Ag-Bi-I ternary thin films using material solution processing. The resulting thin films exhibit controlled surface morphologies and optical bandgaps according to their thermal annealing temperatures. In addition, it has been reported that Ag-Bi-I ternary systems crystallize to AgBi2I7, Ag2BiI5, etc. according to the ratio of the precursor chemicals. The solution-processed AgBi2I7 thin films exhibit a cubic-phase crystal structure, dense, pinhole-free surface morphologies with grains ranging in size from 200 to 800 nm, and an indirect bandgap of 1.87 eV. The resultant AgBi2I7 thin films show good air stability and energy band diagrams, as well as surface morphologies and optical bandgaps suitable for lead-free and air-stable single-junction solar cells. Very recently, a solar cell with 4.3% power conversion efficiency was obtained by optimizing the Ag-Bi-I crystal compositions and solar cell device architectures. © 2018, Journal of Visualized Experiments. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/9385
DOI
10.3791/58286
Publisher
MYJoVE Corporation
Related Researcher
Files:
There are no files associated with this item.
Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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