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Lead sulphide nanocrystal photodetector technologies

Nature Photonics volume 10, pages 81–92 (2016)Cite this article

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Abstract

Light detection is the underlying principle of many optoelectronic systems. For decades, semiconductors including silicon carbide, silicon, indium gallium arsenide and germanium have dominated the photodetector industry. They can show excellent photosensitivity but are limited by one or more aspects, such as high production cost, high-temperature processing, flexible substrate incompatibility, limited spectral range or a requirement for cryogenic cooling for efficient operation. Recently lead sulphide (PbS) nanocrystals have emerged as one of the most promising new materials for photodetector fabrication. They offer several advantages including low-cost manufacturing, solution processability, size-tunable spectral sensitivity and flexible substrate compatibility, and they have achieved figures of merit outperforming conventional photodetectors. We review the underlying concepts, breakthroughs and remaining challenges in photodetector technologies based on PbS nanocrystals.

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Figure 1: Tunable optical properties of PbS nanocrystals.
Figure 2: Device architecture and configuration of PbS NC-based photodetectors.
Figure 3: Charge transport in PbS NC films under dark and photoexcited conditions.
Figure 4: Applications of PbS NC-based photodetector devices.

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Acknowledgements

This work was supported by UK Engineering and Physical Sciences Research Council (EPSRC) grant EP/M015513/1.

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  1. Department of Electrical and Electronic Engineering, Advanced Technology Institute, University of Surrey, Guildford, GU2 7XH, Surrey, UK

    Rinku Saran & Richard J. Curry

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R.S. and R.J.C. co-wrote the paper.

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Correspondence to Rinku Saran or Richard J. Curry.

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Saran, R., Curry, R. Lead sulphide nanocrystal photodetector technologies. Nature Photon 10, 81–92 (2016). https://doi.org/10.1038/nphoton.2015.280

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