Publication: Influence of SCN− moiety on CH3NH3PbI3 perovskite film properties and the performance of carbon-based hole-transport-layer-free perovskite solar cells
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Issued Date
2022
Resource Type
Language
eng
File Type
application/pdf
ISSN
9574522
Rights Holder(s)
Scopus
Bibliographic Citation
Journal of Materials Science: Materials in Electronics. Vol 33, No.3 (2022), p.1589-1603
Suggested Citation
Prasan P., Aunping N., Chanlek N., Kumlangwan P., Towannang M., Klangtakai P., Srepusharawoot P., Thongnum A., Kumnorkaew P., Jarernboon W., Pimanpang S., Amornkitbamrung V. Influence of SCN− moiety on CH3NH3PbI3 perovskite film properties and the performance of carbon-based hole-transport-layer-free perovskite solar cells. Journal of Materials Science: Materials in Electronics. Vol 33, No.3 (2022), p.1589-1603. doi:10.1007/s10854-021-07687-4 Retrieved from: https://hdl.handle.net/20.500.14740/10306
Abstract
CH3NH3PbI3 perovskite films were prepared via a hot-casting method using six different CH3NH3I, PbI2 and Pb(SCN)2 solutions. Surface morphology of perovskite films with low SCN− dopant levels (0.0625 M and 0.125 M Pb(SCN)2) showed smooth surfaces and large grain sizes. However, with the high SCN− dopant levels (0.1875 M and 0.25 M Pb(SCN)2), rough surfaces were produced with pinholes. The crystal of pure CH3NH3PbI3 (0 M Pb(SCN)2) film is a tetragonal perovskite structure. XRD spectra of all five Pb(SCN)2 added films show the present of CH3NH3PbI3 films and the additional peak at 12.66°. Rietveld refinement analysis reveals that the Pb(SCN)2 addition causes the second phase PbI2 formation along with the tetragonal MAPbI3 perovskite film rather than the CH3NH3Pb(SCN)xI3-x perovskite formation. The carbon-based hole-transport-layer (HTL)-free perovskite (from 0.0625 M Pb(SCN)2 dopant) solar cell is the optimal ratio in generating a promising cell efficiency, 6.34%, with a good efficiency retention of 79.43% after 30 days of testing in comparison to a pure CH3NH3PbI3 (0 M Pb(SCN)2 dopant) perovskite solar cell with an efficiency retention of only 26.92%. The great stability of the Pb(SCN)2 added perovskite solar cells is attributed to the PbI2 layer covered MAPbI3 grains blocking oxygen and/or water molecules from degrading MAPbI3 perovskite. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.