Publication: Effect of GeI2 and GeBr2 incorporation on perovskite properties and performance of carbon-based perovskite solar cells
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Issued Date
2023
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application/pdf
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มหาวิทยาลัยศรีนครินทรวิโรฒ
Bibliographic Citation
Journal of the Korean Physical Society. Vol 82, No.8 (2023), p.763-775
Suggested Citation
Aunping N., Kumlangwan P., Towannang M., Chanlek N., Kumnorkaew P., Klangtakai P., Srepusharawoot P., Thongnum A., Chompoosor A., Jarernboon W., Pimanpang S., Ruttanapun C., Amornkitbamrung V. Effect of GeI2 and GeBr2 incorporation on perovskite properties and performance of carbon-based perovskite solar cells. Journal of the Korean Physical Society. Vol 82, No.8 (2023), p.763-775. doi:10.1007/s40042-023-00737-6 Retrieved from: https://hdl.handle.net/20.500.14740/12527
Other Contributor(s)
Abstract
CH3NH3PbI3 (MAPbI3) film was prepared by a convective method, and its X-ray diffraction spectrum displays the tetragonal perovskite structure. GeI2 and GeBr2 powders dissolve poorly in a mixed dimethylformamide-dimethylsulfoxide (DMF-DMSO) solvent, but the introduction of 5 wt% 5-ammonium valeric acid iodide (5-AVAI) into the mixed DMF-DMSO solvent greatly promotes GeI2 and GeBr2 solubility. XRD spectra of the (5-AVAI)MAPbI3, MAGexPb1–xI3, and MAGexPb1–xBr2xI3–2x (x = 0.0625 and 0.125) films exhibit a tetragonal perovskite structure, but the film morphologies become rougher than that of the pristine MAPbI3 film. Discontinuous islands are formed on MAGexPb1–xI3 and MAGexPb1–xBr2xI3–2x (x = 0.125) films. X-ray photoemission spectroscopy (XPS) analysis detected the Ge element on all Ge-doped films. The best performance levels of the carbon-based hole transport layer-free MAGexPb1–xI3–x (x = 0.0625, η= 3.63%) and MAGexPb1–xBr2xI3–2x (x = 0.0625, η = 2.95%) perovskite solar cells are lower than that of the pristine MAPbI3–based perovskite solar cell (η = 5.28%). This is likely due to the increased surface roughness, pin-holes, isolated islands, and the decreased light absorbance of the Ge-doped films in comparison with the pristine MAPbI3 film. © 2023, The Korean Physical Society.