Understanding charge transport in lead iodide perovskite thin-film field-effect transistors

Satyaprasad P. Senanayak, Bingyan Yang, Tudor H. Thomas, Nadja Giesbrecht, Wenchao Huang, Eliot Gann, Bhaskaran Nair, Karl Goedel, Suchi Guha, Xavier Moya, Christopher R. McNeill, Pablo Docampo, Aditya Sadhanala, Richard H. Friend, Henning Sirringhaus

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Abstract

Fundamental understanding of the charge transport physics of hybrid lead halide perovskite semiconductors is important for advancing their use in high-performance optoelectronics. We use field-effect transistors (FETs) to probe the charge transport mechanism in thin films of methylammonium lead iodide (MAPbI3). We show that through optimization of thin-film microstructure and source-drain contact modifications, it is possible to significantly minimize instability and hysteresis in FET characteristics and demonstrate an electron field-effect mobility (mFET) of 0.5 cm2/Vs at room temperature. Temperature-dependent transport studies revealed a negative coefficient of mobility with three different temperature regimes. On the basis of electrical and spectroscopic studies, we attribute the three different regimes to transport limited by ion migration due to point defects associated with grain boundaries, polarization disorder of the MA+ cations, and thermal vibrations of the lead halide inorganic cages.

Original languageEnglish
Article numbere1601935
Number of pages10
JournalScience Advances
Volume3
Issue number1
DOIs
Publication statusPublished - 27 Jan 2017

Cite this

Senanayak, S. P., Yang, B., Thomas, T. H., Giesbrecht, N., Huang, W., Gann, E., Nair, B., Goedel, K., Guha, S., Moya, X., McNeill, C. R., Docampo, P., Sadhanala, A., Friend, R. H., & Sirringhaus, H. (2017). Understanding charge transport in lead iodide perovskite thin-film field-effect transistors. Science Advances, 3(1), [e1601935]. https://doi.org/10.1126/sciadv.1601935