Publication: The Effects of CsBr Concentration on the Inorganic Cesium Lead Bromide Perovskite Film Properties and the Performances of Carbon-Based HTM-Free Perovskite Solar Cells
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Issued Date
2022
Resource Type
Language
eng
File Type
application/pdf
ISSN
25869396
Rights Holder(s)
Scopus
Bibliographic Citation
Journal of Health Research. Vol 36, No.2 (2022), p.186-198
Suggested Citation
Homrahad V., Towannang M., Kumlangwan P., Jarernboon W., Pimanpang S., Amornkitbambung V. The Effects of CsBr Concentration on the Inorganic Cesium Lead Bromide Perovskite Film Properties and the Performances of Carbon-Based HTM-Free Perovskite Solar Cells. Journal of Health Research. Vol 36, No.2 (2022), p.186-198. doi:10.55003/cast.2022.05.22.003 Retrieved from: https://hdl.handle.net/20.500.14740/10023
Abstract
Inorganic cesium lead bromide (ICLB) perovskite films were prepared onto an FTO conductive substrate by a two-step spin-dipping method. PbBr2 films were first coated onto the FTO substrate, and then they were immersed into CsBr solutions at various concentrations: 0.04, 0.06, 0.08, 0.10, and 0.12 M, forming the ICLB perovskite films. The surface morphology of the perovskite films prepared from the CsBr concentrations under 0.08 M had a uniform crystalline surface, but the CsBr concentrations above 0.08 M gave the film a non-uniform structure. XRD spectra of all ICLB films compose of mixed phases of monoclinic-CsPbBr3 and tetragonal-CsPb2Br5. The direct optical bandgap of 2.3 eV corresponded to the CsPbBr3 phase, and the indirect optical bandgap of 2.87-3.10 eV corresponded to the CsPb2Br5 phase. Carbon-based hole-transport-material (HTM) free CsPb2Br5-CsPbBr3 perovskite solar cells were assembled, and the CsPb2Br5-CsPbBr3 perovskite solar cells prepared from 0.08 M CsBr concentration delivered the highest efficiency of 2.6%. This was because the 0.08 M-perovskite film had good uniformity, low pinhole defect, and low PbBr2 impurities. Good cell stability, with an efficiency reduction of 10.0% of the initial value after 816 h under ambient environment, was achieved from the 0.08 M CsBr concentration cells. © 2022, King Mongkut's Institute of Technology Ladkrabang. All rights reserved.