Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/75000
Título: | High-performance self-powered photodetectors achieved through the pyro-phototronic effect in Si/SnOx/ZnO heterojunctions |
Autor(es): | Silva, José Pedro Basto Vieira, E. M. F Gwozdz, Katarzyna Kaim, Adrian Gonçalves, L. M. MacManus-Driscoll, Judith L. Hoye, Robert L. Z. Pereira, Mário |
Palavras-chave: | Photodetector Pyro-phototronic effect Heterojunctions Photocurrent Ultrafast photosensor |
Data: | 2021 |
Editora: | Elsevier 1 |
Revista: | Nano Energy |
Resumo(s): | Coupling together the pyroelectric effect and the photovoltaic effect is a novel method to significantly enhance the performance of photodetectors. In this work, we make use of this effect through a tri-layered heterojunction of n-Si/p-SnOx/n-ZnO, which takes advantage of the pyroelectric properties of the n-type ZnO film and the photovoltaic response of the n-type Si/p-type SnOx heterojunction. The photo-response of the device, with excitation from a 405 nm wavelength laser, is carefully investigated, and it is shown that the photodetector performance is improved with increased chopper frequency owing to the coupled photovoltaic-pyroelectric ef fect. The Al/Si/SnOx/ZnO/ITO device exhibits an optimum responsivity and detectivity of 36.7 mA/W and 1.5 × 1011 Jones, respectively, with a laser power density of 36 mW/cm2 and at a chopper frequency of 400 Hz. Ul trafast rise and fall times of 3 and 2 µs, respectively, were obtained. Moreover, by using a 650 nm wavelength laser source, the responsivity and detectivity were improved up to 64.1 mA/W and 2.4 × 1011 Jones, respec tively. The performance of these photodetectors is approximately twice as fast as other pyro-phototronic devices, and exhibits comparable photodetector characteristics when compared to perovskite/Si heterojunction and transition metal dichalcogenides lateral heterojunction devices. Therefore, by combining a pyroelectric ZnO film with a solar cell into one single structure, photodetectors based on the pyro-phototronic effect have been developed that demonstrate state-of-the-art performance. The devices show great promise for visible ultrafast photosensing. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/75000 |
DOI: | 10.1016/j.nanoen.2021.106347 |
ISSN: | 2211-2855 |
Versão da editora: | https://www.sciencedirect.com/science/article/pii/S2211285521006029#! |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CDF - FMNC - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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1-s2.0-S2211285521006029-main (3).pdf Acesso restrito! | 6,23 MB | Adobe PDF | Ver/Abrir |