Deciphering photocarrier dynamics for tuneable high-performance perovskite-organic semiconductor heterojunction phototransistors

Yen-Hung Lin (), Wentao Huang, Pichaya Pattanasattayavong, Jongchul Lim, Ruipeng Li, Nobuya Sakai, Julianna Panidi, Min Ji Hong, Chun Ma, Nini Wei, Nimer Wehbe, Zhuping Fei, Martin Heeney, John G. Labram, Thomas D. Anthopoulos () and Henry J. Snaith ()
Additional contact information
Yen-Hung Lin: University of Oxford
Wentao Huang: Imperial College London
Pichaya Pattanasattayavong: School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC)
Jongchul Lim: University of Oxford
Ruipeng Li: Brookhaven National Laboratory, Upton
Nobuya Sakai: University of Oxford
Julianna Panidi: Imperial College London
Min Ji Hong: Oregon State University
Chun Ma: King Abdullah University of Science and Technology (KAUST)
Nini Wei: King Abdullah University of Science and Technology (KAUST), Core Labs
Nimer Wehbe: King Abdullah University of Science and Technology (KAUST), Core Labs
Zhuping Fei: Imperial College London
Martin Heeney: Imperial College London
John G. Labram: Oregon State University
Thomas D. Anthopoulos: King Abdullah University of Science and Technology (KAUST)
Henry J. Snaith: University of Oxford

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: Abstract Looking beyond energy harvesting, metal-halide perovskites offer great opportunities to revolutionise large-area photodetection technologies due to their high absorption coefficients, long diffusion lengths, low trap densities and simple processability. However, successful extraction of photocarriers from perovskites and their conversion to electrical signals remain challenging due to the interdependency of photogain and dark current density. Here we report hybrid hetero-phototransistors by integrating perovskites with organic semiconductor transistor channels to form either “straddling-gap” type-I or “staggered-gap” type-II heterojunctions. Our results show that gradual transforming from type-II to type-I heterojunctions leads to increasing and tuneable photoresponsivity with high photogain. Importantly, with a preferential edge-on molecular orientation, the type-I heterostructure results in efficient photocarrier cycling through the channel. Additionally, we propose the use of a photo-inverter circuitry to assess the phototransistors’ functionality and amplification. Our study provides important insights into photocarrier dynamics and can help realise advanced device designs with “on-demand” optoelectronic properties.

Date: 2019
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DOI: 10.1038/s41467-019-12481-2

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