Solution-processed photodetectors could be of use in large-area light-sensing applications because they can be fabricated at low cost on plastic substrates and their absorption spectra can be tuned by chemical design. However, fabricating photodetectors with low dark currents and integrating them into high-resolution backplanes remains challenging. Here we show that solution-processed metal halide perovskite photodiodes on top of an amorphous indium gallium zinc oxide transistor backplane can be used to create a flexible image sensor that is ~100 μm thick and has a resolution of 508 pixels per inch. We have developed a pixel edge cover layer for the system that reduces electrode current leakage and thus dark current density. The low noise current in combination with high external quantum efficiency results in high photodetectivity at wavelengths from 550 nm to 770 nm. We show that our imager can be used for document scanning and biometric fingerprinting and that it can be wrapped around objects with radii as small as 0.6 cm.
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The datasets analysed in this study are available from the corresponding authors upon reasonable request.
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We thank the process engineers of Holst Centre’s R&D TFT Pilot Line for the realization of the TFT backplanes, as well as the thin-film encapsulation on top of the PPD frontplane. We also acknowledge M. Fattori (Eindhoven University of Technology) for his help with the noise measurements. This work is partly financed through the Flexlines project within the Interreg V-programme Flanders–Netherlands, a cross-border cooperation programme with financial support from the European Regional Development Fund, and co-financed by the Province of Noord-Brabant, Netherlands.
The authors declare no competing interests.
Peer review information Nature Electronics thanks Zhiyong Fan, Hang Zhou and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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van Breemen, A.J.J.M., Ollearo, R., Shanmugam, S. et al. A thin and flexible scanner for fingerprints and documents based on metal halide perovskites. Nat Electron 4, 818–826 (2021). https://doi.org/10.1038/s41928-021-00662-1
Nature Electronics (2021)