Surface Photovoltage Analysis of Lead Halide Perovskites prepared from different Solutions

Thomas Dittrich^a, Atittaya Naikaew^a^,^b, Pongthep Prajongtat^a^,^b, Marisa Arunchaiya^b, Thidarat Supasai^b, Voranuch Somsongkul^c, Felix Lang^d

^aDepartment of Materials Science, Faculty of Science, Kasetsart University, Bangkok, 10900

^bDepartment of Industrial Chemistry, Faculty of Applied Science, King Mongkut’s University of Technology North Bangkok, Bangkok 10800

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, Atittaya Naikaew, 395
Publication date: 5th February 2015

Lead halide perovskites (CH₃NH₃PbI_3-xCl_x) were prepared by one-step method on different substrates from solutions of CH₃NH₃I, PbCl₂ and PbI₂dissolved in mixed solvents with varying concentrations of g-butyrolactone and dimethylsulfoxide and by applying a so-called dripping procedure [1]. Metal oxide substrates were produced by spray pyrolysis. Charge separation in layers of the lead halide perovskites was investigated by time resolved and spectral dependent surface photovoltage (SPV) techniques. The sign, the amplitude and features related to defect states of SPV signals were very sensitive to the nature of the substrates under investigated (ZnO, TiO₂ and MoO₃), the preparation conditions of the substrates (deposition temperatures) and the preparation conditions of the perovskites (concentrations of precursors and ratios of the mixed solvents). The SPV techniques are powerful and can be applied for monitoring electronic properties of lead halide perovskites at the various preparation steps of solar cells and these properties are related to solar cell performances.

[1] Jeon, N. J.; Noh, J. H.; Kim, Y. C.; Yang, W. S.; Ryu, S.; Seok, S. I. Solvent engineering for high-performance inorganic–organic hybrid perovskite solar cells. Nature Mater. 2014, 13, 897-903.

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