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Issue 8, 2019
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Cascade-type energy band design of a black phosphorus photodetector with high performance

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Abstract

The hybrid-induced photogating effect using colloidal quantum dots is usually utilized to optimize the performance of 2D-based photodetectors, where the 2D material is usually black phosphorus, transition metal dichalcogenides or graphene. However, the method of integrating a single-layer light absorber material with 2D materials for increasing the photoresponse has suffered from limited depletion width so it can hardly achieve our desired application. Here, we proposed a hybrid BP/lead sulfide quantum dot photodetector with a cascade-type energy band structure, which can greatly improve the performance of this photodetector compared with a single-layer absorber. This device can display a high responsivity of 1.1 × 107 A W−1, a high detectivity of 1.75 × 1015 Jones, and a low noise equivalent power of 4.3 × 10−7 pW Hz−1/2 simultaneously. These results indicate that a cascade-type energy band structure is not only able to effectively enhance the performance of the hybrid BP/lead sulfide quantum dot photodetector but also has great potential for wide application in other 2D material-based optoelectronic devices.

Graphical abstract: Cascade-type energy band design of a black phosphorus photodetector with high performance

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Publication details

The article was received on 14 Nov 2018, accepted on 03 Dec 2018 and first published on 04 Dec 2018


Article type: Paper
DOI: 10.1039/C8TC05735D
Citation: J. Mater. Chem. C, 2019,7, 2232-2239

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    Cascade-type energy band design of a black phosphorus photodetector with high performance

    C. You, G. Zhang, W. Deng, C. Zhao, B. An, B. Liu, B. Wang, H. Yan, D. Liu and Y. Zhang, J. Mater. Chem. C, 2019, 7, 2232
    DOI: 10.1039/C8TC05735D

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