Post-processing and intensity-dependent charge carrier generation in thin-film solution-processed lead-halide perovskite for electro-optical applications

Simon Bretschneider^a, Frédéric Laquai^a

^aMax Planck Institute for Polymer Research, Mainz, Ackermannweg, 10, Mainz, Germany

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Simon Bretschneider, 391
Publication date: 5th February 2015

Lead-halide perovskites have emerged as a new class of materials for electro-optical, especially photovoltaic applications with power conversion efficiencies up to 24 %^[1]. High-performance electro-optical devices rely on perovskite films without pinholes as well as a flat surface with a well-defined thickness. Due to the organic/inorganic nature of the lead-halide perovskite and the criticalness of a pure perovskite phase without impurities of the precursors, utilization of the advantages of solution-processing and prevention of environment-induced degradation is non-trivial. Time-resolved transient absorption and photoluminescence spectroscopy in the visible spectral range allow precise characterization of the charge generation and recombination mechanisms in lead-halide perovskite films. In this work, we use these techniques to investigate effects of different annealing schemes and vacuum-induced changes of solution-processed lead-halide perovskite films grown in a dry nitrogen atmosphere. Our findings indicate that the charge generation and recombination in lead-halide perovskite is not just dependent on the annealing conditions, thus morphology of the film, but also dependent on the post-processing conditions of the device.

[1] WCPEC-6 Conference Highlights (09.02.2015)

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