Publication: Calculation and Fabrication of a CH3NH3Pb(SCN)xI3−x Perovskite Film as a Light Absorber in Carbon-based Hole-transport-layer-free Perovskite Solar Cells
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Issued Date
2020
Resource Type
File Type
application/pdf
ISSN
3744884
Other identifier(s)
2-s2.0-85096310998
Rights
Srinakharinwirot University
Rights Holder(s)
Scopus
Bibliographic Citation
Journal of the Korean Physical Society. Vol 77, No.12 (2020), p.1210-1217
Suggested Citation
Kumlangwan P., Suksangrat P., Towannang M., Faibut N., Harnchana V., Srepusharawoot P., Chompoosor A., Kumnorkaew P., Jarernboon W., Pimanpang S., Amornkitbamrung V. Calculation and Fabrication of a CH3NH3Pb(SCN)xI3−x Perovskite Film as a Light Absorber in Carbon-based Hole-transport-layer-free Perovskite Solar Cells. Journal of the Korean Physical Society. Vol 77, No.12 (2020), p.1210-1217. doi:10.3938/jkps.77.1210 Retrieved from: https://hdl.handle.net/20.500.14740/5491
Abstract
CH3NH3Pb(SCN)xI3−x films were prepared using a hot-casting method with five different Pb(SCN)2/PbI2 levels (x = 0, 0.25, 0.5, 1 and 2). Substitution of SCN− in the CH3NH3PbI3 structures induces a film color transformation from black to yellow. UV vis spectra of CH3NH3Pb(SCN)xI3−x films display an increased band gap from 1.59 eV (pure CH3NH3PbI3 film) to 2.37 eV (MAPb(SCN)2I films). Experimental XRD spectra of CH3NH3Pb(SCN)xI3−x films for increasing SCN− levels show a reduced angle of the (110) plane in the same trend as for the simulated tetragonal CH3NH3Pb(SCN)xI3−x structures. The calculated bandgap of simulated tetragonal CH3NH3Pb(SCN)xI3−x structures also increases with the SCN− concentration. Maximal efficiency, 4.56%, was gained from a carbon-based hole-transport layer (HTL)-free CH3NH3PbI3 (x = 0) perovskite solar cell. This is attributed to the low bandgap of CH3NH3PbI3 (1.59 eV). Although, the efficiency of the carbon-based HTL-free CH3NH3Pb(SCN)xI3−x solar cells decreases with increasing SCN− ratio, the excellent solar cell stability was obtained from carbon-based HTL-free CH3NH3Pb(SCN)xI3−x (x = 0.25, 0.5, 1 and 2) solar cells. This should be influenced by the presence of the hydrogen bonds between H and S and/or H and N in the CH3NH3Pb(SCN)xI3−x structures. The carbon-based HTL-free CH3NH3Pb(SCN)0.5I2.5 solar cell delivers a promising efficiency of 3.07%, and its efficiency increases by 11.40% of its initial value after 30-day storage. © 2020, The Korean Physical Society.