Tin(iv) dopant removal through anti-solvent engineering enabling tin based perovskite solar cells with high charge carrier mobilities. Issue 27 (25th June 2019)

• Record Type: Journal Article
• Authors: Bandara, R. M. I.; Jayawardena, K. D. G. I.; Adeyemo, S. O.; Hinder, S. J.; Smith, J. A.; Thirimanne, H. M.; Wong, N. C.; Amin, F. M.; Freestone, B. G.; Parnell, A. J.; Lidzey, D. G.; Joyce, H. J.; Sporea, R. A.; Silva, S. R. P.
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 27(2019)
• Page Start: 8389
• Page End: 8397
• Publication Date: 2019-06-25
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc02003a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : We report the need for careful selection of anti-solvents for Sn-based perovskite solar cells fabricated through the commonly used anti-solvent method, compared to their Pb-based counterparts. Abstract : We report the need for careful selection of anti-solvents for Sn-based perovskite solar cells fabricated through the commonly used anti-solvent method, compared to their Pb-based counterparts. This, in combination with the film processing conditions used, enables the complete removal of unwanted Sn 4+ dopants, through engineering the anti-solvent method for Sn-based perovskites. Using a Cs0.05 (FA0.83 MA0.17 )0.95 Pb0.5 Sn0.5 I3 perovskite, charge carrier mobilities of 32 ± 3 cm 2 V −1 s −1 (the highest reported for such systems through the optical-pump terahertz probe technique) together with ∼28 mA cm −2 short circuit current densities are achieved. A champion efficiency of 11.6% was obtained for solvent extraction using toluene (an 80% enhancement in efficiency compared to the other anti-solvents) which is further improved to 12.04% following optimised anti-solvent wash and thermal treatment. Our work highlights the importance of anti-solvents in managing defects for high efficiency low bandgap perovskite materials and develops the potential for all-perovskite tandem solar cells.