TY - JOUR
T1 - Enhancement of performance of Ga incorporated ZnO UV photodetectors prepared by simplified two step chemical solution process
AU - Kumar, Karuppiah Deva Arun
AU - Mele, Paolo
AU - Murahari, Prashantha
AU - Abdeltawab, Ahmed A.
AU - Mohammady, Sayed Z.
AU - Ubaidullah, Mohd
AU - Samdani, Mohammad Shahzad
AU - AlFaify, S.
N1 - Funding Information:
The authors from KSU extend their appreciation to the Deanship of Scientific Research at King Saud University for funding this work through research group No ( RG- 1436-026 ). The authors from KKU would like to express their gratitude to the Deanship of Scientific Research at King Khalid University for funding part of this work through the Research Groups Program under Grant No. R.G.P.2/160/42.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/1/1
Y1 - 2022/1/1
N2 - The present study establishes the UV photodetector capability of Zinc Oxide (ZnO) and Gallium incorporated ZnO (GZO) thin films prepared by a simplified two-step chemical bath deposition technique. The prepared UV detectors were characterized by tools such as XRD, SEM, UV, PL and Photoresponse to investigate their properties. The structural study revealed the enhancement of film crystallinity with respect to Ga doping level. The optical studies confirm the higher absorption at UV range for 3% Ga doped ZnO film. From PL study, the green emission observed at 522 nm is associated with the defects from oxygen vacancies (Vo+). Once the UV light is irradiated on the GZO film surface, electrons and holes are generated as the illumination energy is larger than the ZnO bandgap energy, known as above-band energy illumination. The photo-generated holes then neutralize the chemisorbed ions causing the release of electrons in the conduction band of ZnO, this could increase the photocurrent. In this study, the calculated photo-detectivity (D*), responsivity (R) and external quantum efficiency (EQE) of the prepared UV detectors are 1.24 ×1010 jones, 0.38 AW-1, and 125.10% respectively for 3% Ga doped ZnO film. These parameters are noticeable and this study proves that GZO films in fact work as good sensitive UV detectors.
AB - The present study establishes the UV photodetector capability of Zinc Oxide (ZnO) and Gallium incorporated ZnO (GZO) thin films prepared by a simplified two-step chemical bath deposition technique. The prepared UV detectors were characterized by tools such as XRD, SEM, UV, PL and Photoresponse to investigate their properties. The structural study revealed the enhancement of film crystallinity with respect to Ga doping level. The optical studies confirm the higher absorption at UV range for 3% Ga doped ZnO film. From PL study, the green emission observed at 522 nm is associated with the defects from oxygen vacancies (Vo+). Once the UV light is irradiated on the GZO film surface, electrons and holes are generated as the illumination energy is larger than the ZnO bandgap energy, known as above-band energy illumination. The photo-generated holes then neutralize the chemisorbed ions causing the release of electrons in the conduction band of ZnO, this could increase the photocurrent. In this study, the calculated photo-detectivity (D*), responsivity (R) and external quantum efficiency (EQE) of the prepared UV detectors are 1.24 ×1010 jones, 0.38 AW-1, and 125.10% respectively for 3% Ga doped ZnO film. These parameters are noticeable and this study proves that GZO films in fact work as good sensitive UV detectors.
KW - External quantum efficiency
KW - Ga doped ZnO
KW - PL
KW - Responsivity
KW - UV photodetector
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U2 - 10.1016/j.sna.2021.113217
DO - 10.1016/j.sna.2021.113217
M3 - Article
AN - SCOPUS:85119657490
SN - 0924-4247
VL - 333
JO - Sensors and Actuators A: Physical
JF - Sensors and Actuators A: Physical
M1 - 113217
ER -