Ambipolar solution-processed hybrid perovskite phototransistors

Feng Li (), Chun Ma, Hong Wang, Weijin Hu, Weili Yu, Arif D. Sheikh and Tom Wu ()
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Feng Li: King Abdullah University of Science and Technology
Chun Ma: King Abdullah University of Science and Technology
Hong Wang: King Abdullah University of Science and Technology
Weijin Hu: King Abdullah University of Science and Technology
Weili Yu: King Abdullah University of Science and Technology
Arif D. Sheikh: King Abdullah University of Science and Technology
Tom Wu: King Abdullah University of Science and Technology

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Organolead halide perovskites have attracted substantial attention because of their excellent physical properties, which enable them to serve as the active material in emerging hybrid solid-state solar cells. Here we investigate the phototransistors based on hybrid perovskite films and provide direct evidence for their superior carrier transport property with ambipolar characteristics. The field-effect mobilities for triiodide perovskites at room temperature are measured as 0.18 (0.17) cm2V−1s−1 for holes (electrons), which increase to 1.24 (1.01) cm2V−1s−1 for mixed-halide perovskites. The photoresponsivity of our hybrid perovskite devices reaches 320 A W−1, which is among the largest values reported for phototransistors. Importantly, the phototransistors exhibit an ultrafast photoresponse speed of less than 10 μs. The solution-based process and excellent device performance strongly underscore hybrid perovskites as promising material candidates for photoelectronic applications.

Date: 2015
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DOI: 10.1038/ncomms9238

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