RT Journal Article
T1 Improved optoelectronic properties of nanostructured Eu doped Bi2S3 thin films for the detection of UV light
A1 Shkir, Mohd
A1 Ben Gouider Trabelsi, Amira
A1 Alkallas, Fatemah H.
A1 Alfaify, Salem
A1 Pandit, Bidhan
A1 Ubaidullah, Mohd
AB Due to a suitable band gap and high light absorption behavior, Bi2S3 is showing major success in photo-to-current conversion applications. In this current work, the authors used a low-cost nebulizer spray pyrolysis method to create nano-sized pure and unique Eu contents (1-5 wt.%)-loaded Bi2S3 thin layers by taking bismuth nitrate and thiourea as the source materials. The parent and Eu doped Bi2S3 thin films, deposited on a well-cleaned glass substrate at 350 °C, were analyzed using a variety of characterization approaches, including FESEM, EDS, XRD, PL, UV-Vis, and I-V, to describe the morphologies, compositions, crystallinity, defect states, band gap, and photodetection capability, respectively. The X-ray diffraction outcomes confirmed an orthorhombic polycrystalline structure for all Eu concentrations, and they were highly oriented along the (130) plane. Incorporation of Eu into the host matrix improves the intensity of all the peaks, and the crystallite size (25 nm) was found to be highest for the 3% Eu doped Bi2S3 thin film. The formation of a nanowire-like morphology was confirmed thorough field emission electron microscopy analysis, which is preferred for photo detectors. Upon excitation at 325 nm, grown pure and Eu doped Bi2S3 thin films indicated five emission peaks at 387, 418, 439, 480, and 523 nm, respectively. All the films showed significant absorption in the UV region, and importantly, a narrowing of the band gap is seen from 2.29 to 2.17 eV. Finally, the current-voltage characteristics of the pure and Eu doped Bi2S3 thin films were tested using silver contacts as electrodes. The results showed that the 3% Eu doped Bi2S3 sample showed a higher UV photocurrent characteristic, with high specific detectivity (1.82 × 1010 Jones), photoresponsivity (3.88 × 10-1 AW-1), external quantum efficiency (125%), and rapid photo response, as well as a recovery speed of 0.3 s and 0.4 s, due to the effective light absorption and photocarrier generation. We believe that our study may provide a cost-effective approach for UV photosensor applications.
PB MDPI
SN 2073-4352
YR 2022
FD 2022-10
LK https://hdl.handle.net/10016/37165
UL https://hdl.handle.net/10016/37165
LA eng
NO This research was funded by Princess Nourah bint Abdulrahman University Researchers Supporting Project number (PNURSP2022R38), Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia. The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work through a Research Groups Program under Grant No. R.G.P. 2/249/43.
DS e-Archivo
RD 1 jul. 2024