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dc.contributor.authorHong, Zonghanen
dc.contributor.authorTan, Davinen
dc.contributor.authorJohn, Rohit Abrahamen
dc.contributor.authorTay, Eugene Yong Kangen
dc.contributor.authorHo, Terence Yan Kingen
dc.contributor.authorZhao, Xinen
dc.contributor.authorSum, Tze Chienen
dc.contributor.authorMathews, Nripanen
dc.contributor.authorGarcía, Felipeen
dc.contributor.authorSoo, Han Senen
dc.identifier.citationHong, Z., Tan, D., John, R. A., Tay, E. Y. K., Ho, T. Y. K., Zhao, X., … Soo, H. S. (2019). Completely solvent-free protocols to access phase-pure, metastable metal halide perovskites and functional photodetectors from the precursor salts. iScience. doi:10.1016/j.isci.2019.05.042en
dc.description.abstractMechanochemistry is a green, solid-state, re-emerging synthetic technique that can rapidly form complex molecules and materials without exogenous heat or solvent(s). Herein, we report the application of solvent-free mechanochemical ball milling for the synthesis of metal halide perovskites, to overcome problems with solution-based syntheses. We prepared phase-pure, air-sensitive CsSnX3 (X = I, Br, Cl) and their mixed halide perovskites by mechanochemistry for the first time via reactions between cesium and tin(II) halides. Notably, we report the sole examples where metastable, high temperature phases like cubic CsSnCl3, cubic CsPbI3, and trigonal FAPbI3 were accessible at ambient temperatures and pressures without post-synthetic processing. The perovskites can be prepared up to “kilogram scales”. Lead-free, all-inorganic photodetector devices were fabricated using the mechanosynthesized CsSnBr1.5Cl1.5 under solvent-free conditions and showed 10-fold differences between on/off currents. We highlight an essentially solvent-free, general approach to synthesize metastable compounds and fabricate photodetectors from commercially available precursors.en
dc.description.sponsorshipNRF (Natl Research Foundation, S’pore)en
dc.description.sponsorshipASTAR (Agency for Sci., Tech. and Research, S’pore)en
dc.description.sponsorshipMOE (Min. of Education, S’pore)en
dc.format.extent36 p.en
dc.rights© 2019 The Author(s). This is an open access article under the CC BY-NC-ND license (
dc.subjectMetal Halide Perovskitesen
dc.titleCompletely solvent-free protocols to access phase-pure, metastable metal halide perovskites and functional photodetectors from the precursor saltsen
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science & Engineeringen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen
dc.contributor.departmentCN Yang Scholars Programmeen
dc.contributor.researchEnergy Research Institute @NTUen
dc.description.versionPublished versionen
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