Collection of scientific works Nanosystems, nanomaterials, nanotechnologies
Year 2025 Volume 23, Issue 4
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Sabah Salman HAMDI1, Huda Saadi ALI2, and Iftikhar Mahmood ALI3

1College of Computer Science and Mathematics, University of Tikrit, Salahddin Str., 3400 Tikrit, Iraq
2College of Energy and Environmental Sciences, Department of Renewable Energy, Al-Karkh University of Science, Haifa Str., Al-Karkh, Iraq
3College of Science, Physics Department, University of Baghdad, Al-Jadriya Str., Baghdad, Iraq

Response of Self-Powered CuS/Si-Nanostructured-Heterojunction Photodetectors to Green Light at 530 nm

1095–1105 (2025)

PACS numbers: 07.60.Rd, 61.05.cp, 68.37.Hk, 78.20.Ci, 78.40.Fy, 78.67.Sc, 85.60.Gz

Received 26 July, 2024; in revised form, 11 September, 2024

This study uses a series of CuS/Si-heterojunction self-powered visible-light photodetectors through chemical spray pyrolysis (CSP) technique at a substrate temperature of 300°C. The thickness of the prepared thin films is of about 228.4 nm measured by cross-sectional thickness. Various characterization techniques are used to investigate the structural and optical properties of the prepared thin films. The XRD results show that the CuS film has a polycrystalline nature, covellite-hexagonal structure, and preferred orientation along (100) planes. FESEM results show the formation of nanostructures consisting of stone-like shapes. The UV-visible absorbance spectra are recorded in range 300-1100 nm to investigate the optical characteristics. The results show that the absorption-coefficient value is α > 104 for film that, in turn, proves that the prepared thin films are likely to have direct electronic transitions. The value of the optical energy gap is of 2.58 eV. Simultaneously, diode behaviour is illustrated by voltage-current characteristic. Also, the manufactured layers show an excellent figure of merit as a function of wavelength. The optical response is R = 16.881 µA/W and the specific detectivity is D* = 9.25·1016 Jones, and the highest quantum-efficiency value is of 39.495 at 530 nm. The well-directed response at the wavelength of 530 nm indicates that the p-CuS/n-Si heterogeneous photodetectors have a great potential for applications. This sensitivity to green light indicates that these photodetectors are particularly effective at detecting green wavelengths.

KEY WORDS: copper sulphide, voltage-current characteristic, spectral response, rise time, optical characteristics

DOI: https://doi.org/10.15407/nnn.23.04.1095

Citation:
Sabah Salman Hamdi, Huda Saadi Ali, and Iftikhar Mahmood Ali, Response of Self-Powered CuS/Si-Nanostructured-Heterojunction Photodetectors to Green Light at 530 nm, Nanosistemi, Nanomateriali, Nanotehnologii, 23, No. 4: 1095–1105 (2025); https://doi.org/10.15407/nnn.23.04.1095
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