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Title: Additive selection strategy for high performance perovskite photovoltaics
Authors: Han, Guifang
Hadi, Harri Dharma
Bruno, Annalisa
Kulkarni, Sneha Avinash
Koh, Teck Ming
Wong, Lydia Helena
Soci, Cesare
Mathews, Nripan
Zhang, Sam
Mhaisalkar, Subodh Gautam
Keywords: Engineering::Materials
Issue Date: 2018
Source: Han, G., Hadi, H. D., Bruno, A., Kulkarni, S. A., Koh, T. M., Wong, L. H., . . . Mhaisalka, S. G. (2018). Additive selection strategy for high performance perovskite photovoltaics. The Journal of Physical Chemistry C, 122(25), 13884-13893. doi:10.1021/acs.jpcc.8b00980
Journal: The Journal of Physical Chemistry C
Abstract: Although much of the initial progress in perovskite solar cells has been made by the archetypal CH3NH3PbI3, incorporation of an additional cation such as formamidinium, cesium, and mixed halides have shown promising results in both stability and device performance. However, the role of the additional cations as well as the mixed halides is yet to be fully understood. In this work, we investigate the role of different additives including group I alkali metal cations (K, Rb, Cs and NH4) and halide anions (Br and I) on double-cation perovskites, i.e., [(MAPbBr3)0.15(FAPbI3)0.85]. A notably longer charge carrier lifetime is achieved for perovskite films with additives and may be attributed to defect passivation. Selection rules are put forward based on the effect of the ionic size of an additive on phase stabilization and defect passivation. Addition of complementary size cation with respect to cation size of the parent perovskite, mainly helps stabilizing the perovskite phase by tuning tolerance factor, while addition of the similar size cation/anion, acts as defect passivator. The performance improvement of devices fabricated using NH4I as additive well supports this hypothesis, and offers yet another pathway toward harnessing the multitude of perovskite compositions to achieve high performing solar cells and perhaps other optoelectronic devices.
ISSN: 1932-7447
DOI: 10.1021/acs.jpcc.8b00980
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles

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