High Responsivity and Response Speed Single-Layer Mixed-Cation Lead Mixed-Halide Perovskite Photodetectors Based on Nanogap Electrodes Manufactured on Large-Area Rigid and Flexible Substrates

Abstract
Mixed-cation lead mixed-halide perovskites are employed as the photoactive material in single-layer solution-processed photodetectors fabricated with coplanar asymmetric nanogap Al–Au and indium tin oxide–Al electrodes. The nanogap electrodes, bearing an interelectrode distance of ≈10 nm, are patterned via adhesion lithography, a simple, low-cost, and high-throughput technique. Different electrode shapes and sizes are demonstrated on glass and flexible plastic substrates, effectively engineering the device architecture, and, along with perovskite film and material optimization, paving the way toward devices with tunable operational characteristics. The optimized coplanar nanogap junction perovskite photodetectors show responsivities up to 33 A W−1, specific detectivity on the order of 1011 Jones, and response times below 260 ns, while retaining a low dark current (0.3 nA) under −2 V reverse bias. These values outperform the vast majority of perovskite photodetectors reported so far, while avoiding the complicated fabrication steps involved in conventional multilayer device structures. This work highlights the promising potential of the proposed asymmetric nanogap electrode architecture for application in the field of flexible optoelectronics.

Citation
Georgiadou DG, Lin Y, Lim J, Ratnasingham S, McLachlan MA, et al. (2019) High Responsivity and Response Speed Single-Layer Mixed-Cation Lead Mixed-Halide Perovskite Photodetectors Based on Nanogap Electrodes Manufactured on Large-Area Rigid and Flexible Substrates. Advanced Functional Materials: 1901371. Available: http://dx.doi.org/10.1002/adfm.201901371.

Acknowledgements
D.G.G. and T.D.A. acknowledge financial support from the European Union Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement 706707. T.D.A. acknowledges the support from King Abdullah University of Science and Technology (KAUST).

Publisher
Wiley

Journal
Advanced Functional Materials

DOI
10.1002/adfm.201901371

Additional Links
https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201901371

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