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Title: Rb as an alternative cation for templating inorganic lead-free perovskites for solution processed photovoltaics
Authors: Harikesh, Padinhare Cholakkal
Mulmudi, Hemant Kumar
Ghosh, Biplab
Goh, Teck Wee
Teng, Yin Ting
Thirumal, Krishnamoorthy
Lockrey, Mark
Weber, Klaus
Koh, Teck Ming
Li, Shuzhou
Mhaisalkar, Subodh
Mathews, Nripan
Keywords: Engineering::Materials
Issue Date: 2016
Source: Harikesh, P. C., Mulmudi, H. K., Ghosh, B., Goh, T. W., Teng, Y. T., Thirumal, K., . . . Mhaisalkar, S. (2016). Rb as an alternative cation for templating inorganic lead-free perovskites for solution processed photovoltaics. Chemistry of Materials, 28(20), 7496-7504. doi:10.1021/acs.chemmater.6b03310
Journal: Chemistry of Materials 
Abstract: Even though perovskite solar cells have reached 22% efficiency within a very short span, the presence of lead is a major bottleneck to its commercial application. Tin and germanium based perovskites failed to be viable replacements due to the instability of their +2 oxidation states. Antimony could be a possible replacement, forming perovskites with structure A3M2X9. However, solution processing of Cs, organic ammonium based Sb perovskites result in the formation of the dimer phase with poor charge transport properties. Here we demonstrate that Rb can template the formation of the desired layered phase irrespective of processing methodologies, enabling the demonstration of efficient lead-free perovskite solar cells.
ISSN: 0897-4756
DOI: 10.1021/acs.chemmater.6b03310
Schools: School of Materials Science and Engineering 
School of Physical and Mathematical Sciences 
Interdisciplinary Graduate School (IGS) 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Research Techno Plaza 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, 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:MSE Journal Articles

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