Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 18, Issue 10, Pages 7284-7292Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp06232b
Keywords
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Funding
- Basic Science Research Program through a National Research Foundation of Korea (NRF) grant - Korean government [2014005051]
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We have presented a detailed analysis of the phase transition kinetics and binding energy states of solution processed methylammonium lead iodide (MAPbI(3)) 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 degrees 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 degrees 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.
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