Transport in single crystal methylammonium lead triiodide perovskites: Hall Effect and Photocurrent

Octavi E. Semonin^a, Giselle Elbaz^a, Jonathan S. Owen^a

^aDepartment of Chemistry, Columbia University, US, Broadway, 3000, New York, United States

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, Octavi E. Semonin, 434
Publication date: 5th February 2015

The fundamental properties of methylammonium lead triiodide (CH3NH3PbI3) perovskites are not well understood, partly because it is difficult to synthesize large samples of pure material. Current preparations are limited because they start from the high temperature crystal phase, which upon cooling can yield multiple crystal domains. In this work we will present room-temperature growth of single crystal methylammonium lead halide perovskites via vapor diffusion. We will show transport and Hall effect measurements, yielding carrier conductivities of order 10-6 S/cm and carrier densities of order 1011 cm-3. Also, we will show scanned photocurrent measurements of these crystals, showing short circuit transport of free carriers over tens of microns. By changing the work function of the metals, transport over a hundred microns can be observed. Both measurements show interesting temperature-dependence, including thermal activation of free carriers. These measurements provide insight into the limits for CH3NH3PbI3 perovskite photovoltaics.

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