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

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 iodi...

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Published in:Science advances 2017-01, Vol.3 (1), p.e1601935-e1601935
Main Authors: Senanayak, Satyaprasad P, Yang, Bingyan, Thomas, Tudor H, Giesbrecht, Nadja, Huang, Wenchao, Gann, Eliot, Nair, Bhaskaran, Goedel, Karl, Guha, Suchi, Moya, Xavier, McNeill, Christopher R, Docampo, Pablo, Sadhanala, Aditya, Friend, Richard H, Sirringhaus, Henning
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cited_by cdi_FETCH-LOGICAL-c456t-c203df0b7e8dfbd3c325c9d77fc1e3abd4e2b1dc726dc0890b4f916c3d7f72f43
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container_title Science advances
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creator Senanayak, Satyaprasad P
Yang, Bingyan
Thomas, Tudor H
Giesbrecht, Nadja
Huang, Wenchao
Gann, Eliot
Nair, Bhaskaran
Goedel, Karl
Guha, Suchi
Moya, Xavier
McNeill, Christopher R
Docampo, Pablo
Sadhanala, Aditya
Friend, Richard H
Sirringhaus, Henning
description 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 (MAPbI ). 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 (μ ) of 0.5 cm /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.
doi_str_mv 10.1126/sciadv.1601935
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title Understanding charge transport in lead iodide perovskite thin-film field-effect transistors
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