Role of Halide Ions in the Making of Organic Lead Halide Perovskites
Prashant Kamat a, Seogjoon Yoon a, Joseph Manser a
a University of Notre Dame, US, Notre Dame, Indiana 46556, EE. UU., Notre Dame, United States
NIPHO
Proceedings of Perovskite Thin Film Photovoltaics (ABXPV16)
Barcelona, Spain, 2016 March 3rd - 4th
Organizers: Emilio Palomares and Nam-Gyu Park
Invited Speaker, Prashant Kamat, presentation 048
Publication date: 14th December 2015
The basic chemical processes that lead to the formation of organic lead halide perovskitesare important for achieving high quality photoactive films. By tuning precursor stoichiometry crystallization kinetics can be tailored to yield improved thin film homogeneity.In addition the stronger complexation of Pb2+ and Br- as compared to Pb2+ and I- dictate the preferential formation of methyl ammonium lead bromide in films prepared from mixed halide systems. The excited state characterization offers a convenient way to probe the evolution of perovskite structure from lead halide complex. The reversible shift in the emission band during laser irradiation indicates preferential binding of anions (Br- versus I-) with Pb2+ ions. Spectroscopic and structural characterization techniques shed light on the thermally-driven evolution of the perovskite structure in mixed halide systems.

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