Phase transition kinetics and surface binding states of methylammonium lead iodide perovskite

G. Rajendra Kumar, A. Dennyson Savariraj, S. N. Karthick, S. Selvam, B. Balamuralitharan, Hee Je Kim, K. K. Viswanathan, M. Vijaykumar, Kandasamy Prabakar

Research output: Contribution to journalArticlepeer-review

99 Scopus citations

Abstract

We have presented a detailed analysis of the phase transition kinetics and binding energy states of solution processed methylammonium lead iodide (MAPbI3) thin films prepared at ambient conditions and annealed at different elevated temperatures. It is the processing temperature and environmental conditions that predominantly control the crystal structure and surface morphology of MAPbI3 thin films. The structural transformation from tetragonal to cubic occurs at 60 °C with a 30 minute annealing time while the 10 minute annealed films posses a tetragonal crystal structure. The transformed phase is greatly intact even at the higher annealing temperature of 150 °C and after a time of 2 hours. The charge transfer interaction between the Pb 4f and I 3d oxidation states is quantified using XPS.

Original languageEnglish
Pages (from-to)7284-7292
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number10
DOIs
StatePublished - 14 Mar 2016

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