Issue 24, 2024

Tri-layered Si/Co3O4/ZnO heterojunction for high-performance visible photodetection

Abstract

Tri-layered heterojunction devices based on oxide thin films are attracting significant attention for ultra-fast visible photodetection. However, the responsivity of these devices is still low. In this work, high performance photodetectors based on a tri-layered heterojunction of n-Si/p-Co3O4/n-ZnO were fabricated. Under no applied bias, a maximum responsivity and detectivity of 14.2 mA W−1 and 1.34 × 1012 Jones were achieved respectively, for a power density of 9.35 mW cm−2. Remarkably, a significant increase in the responsivity of approximately 864% was found when the device was biased at −2 V. This effect is understood based on the coupling of the photovoltaic and pyroelectric effects. Also, upon applying an external bias of −2 V, at a laser power density of 9.35 mW cm−2 and at a chopper frequency of 10 Hz, the device exhibits a detectivity and sensitivity of 3.4 × 1011 Jones and 2.2, respectively, together with a rise and fall time of 4 and 2 μs, respectively. Compared to high performance Al/Si/SnO/ZnO/ITO and Au/pCuI/ZnO devices, our voltage-biased Al/Si/Co3O4/ZnO/ITO devices exhibit a >40% increase in R and >10× higher D*. Furthermore, an important advantage of our PDs is the p-type component, Co3O4, which is more stable and stoichiometric than CuI and SnO, ensuring PD performance that is stable with time. Therefore, n-Si/p-Co3O4/n-ZnO heterojunction devices shows great promise for ultrafast visible photodetection.

Graphical abstract: Tri-layered Si/Co3O4/ZnO heterojunction for high-performance visible photodetection

Supplementary files

Article information

Article type
Paper
Submitted
20 apr 2024
Accepted
20 may 2024
First published
20 may 2024

J. Mater. Chem. C, 2024,12, 8727-8736

Tri-layered Si/Co3O4/ZnO heterojunction for high-performance visible photodetection

L. Domingues, A. R. Jayakrishnan, A. Kaim, K. Gwozdz, M. C. Istrate, C. Ghica, M. Pereira, A. Castro, L. Marques, R. L. Z. Hoye, J. L. MacManus-Driscoll and J. P. B. Silva, J. Mater. Chem. C, 2024, 12, 8727 DOI: 10.1039/D4TC01624F

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