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J Vis Exp. 2018 Sep 27;(139). doi: 10.3791/58286.

Solution-Processed "Silver-Bismuth-Iodine" Ternary Thin Films for Lead-Free Photovoltaic Absorbers.

Author information

1
Convergence Research Center for Solar Energy, Daegu Gyeongbuk Institute of Science and Technology (DGIST); Department of Chemistry and Research Institute for Convergence of Basic Sciences, Hanyang University.
2
Convergence Research Center for Solar Energy, Daegu Gyeongbuk Institute of Science and Technology (DGIST).
3
Convergence Research Center for Solar Energy, Daegu Gyeongbuk Institute of Science and Technology (DGIST); younghoon.kim@dgist.ac.kr.

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.

PMID:
30320753
PMCID:
PMC6235317
[Available on 2020-09-27]
DOI:
10.3791/58286
[Indexed for MEDLINE]

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