Mr. Avijit Dalal Profile

Avijit Dalal

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Publications (3)

Proceedings Article | 30 November 2023 Poster + Paper

Investigation of self-powered photoresponse performance of all inorganic lead-free halide perovskites (CsSnCl3) nanocrystals (NCs) decorated Er:ZnO nanowires/Si heterojunctions

Ajay Kumar, Rajib Saha, Avijit Dalal, Aniruddha Mondal, Neelu Sharma, Subhananda Chakrabarti

Proceedings Volume 12796, 127960G (2023) https://doi.org/10.1117/12.3004180

KEYWORDS: Nanowires, Heterojunctions, Perovskite, Zinc oxide, Silicon, Erbium, Transmission electron microscopy, Photodetectors, Nanocrystals, Light absorption

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In the current study, we report the all-inorganic lead-free halide perovskites-oxide heterojunction based optoelectronic device fabrications on Si substrate by employing cost-effective chemical bath deposition (CBD) and hot-injection techniques. The selective rare-earth doping of erbium (Er) in ZnO nanowires is performed by employing double-step CBD technique on Si platform for developing a superior heterojunction between Er:ZnO and Si. Furthermore, lead-free perovskites NCs of CsSnCl3 are synthesized by using cost-effective hot-injection method and such NCs are decorated over the Er:ZnO nanowires to passivate the surface defect states. The effect of Er-doping and CsSnCl3 incorporation on structural, optical and luminescence properties of nanowire heterojunctions has been successfully investigated by employing XRD, UV-VIS and PL. The crystal structure of Er:ZnO and Er: ZnO-CsSnCl₃ heterojunctions has been analyzed using X-Ray Diffraction (XRD) technique, which confirms the polycrystalline nature of nanowires with the formation of a highly crystalline cubic phase of CsSnCl₃. The optical absorption of Er:ZnO nanowires and CsSnCl₃ NCs are studied by using ultraviolet-visible (UV-VIS) spectroscopy and corresponding energy bandgaps are estimated to be 3.31 eV and 3.24 eV, respectively. The oxygen vacancies and complex defect states are minimized in ZnO nanowires by Er-doping and perovskites NCs addition and such CsSnCl3 decorated Er:ZnO nanowires exhibit enhanced UV luminescence as compared to undoped ZnO. Finally, photoresponse of undoped, Er-doped and CsSnCl₃ incorporated ZnO nanowires/Si heterojunction has been studied by measuring dark and photo-current and photo-current switching at UV-A wavelength region and such heterojunctions shows excellent photoresponse under self-powered mode. Therefore, such perovskites incorporated Er:ZnO nanowires/Si heterojunction can be a potential candidate for fabricating a highly responsive self-powered UV-detector (UV-A).

Proceedings Article | 5 October 2023 Poster + Paper

Validation of stable p-type phosphorus (P) doped ZnO thin films formation by investigating the photoresponse properties of P: ZnO/Ga2O3 heterojunctions

Archishman Saha, Madhuri Mishra, Rajib Saha, Avijit Dalal, Ankita Sengupta, Aniruddha Mondal, Sanatan Chattopadhyay, Subhananda Chakrabarti

Proceedings Volume 12651, 1265109 (2023) https://doi.org/10.1117/12.2677483

KEYWORDS: Zinc oxide, Heterojunctions, Thin films, Switching, Gallium, Photodetectors, Silicon, Phosphorus, Optoelectronic devices, Electrical conductivity

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SPIE Journal Paper | 8 October 2020

Detection technique for vitamin D₃ using Er-doped TiO₂ nanowire-based UV photodetector

Shyam Murli Manohar Dhar Dwivedi, Anupam Ghosh, Sagarika Deepthy, Moumita Maji, Rini Lahiri, Sanjib Mondal, Chiranjib Ghosh, Avijit Dalal, Aniruddha Mondal, Monidipa Ghosh

JNP, Vol. 14, Issue 04, 046001, (October 2020) https://doi.org/10.1117/12.10.1117/1.JNP.14.046001

KEYWORDS: Silver, Erbium, Neptunium, Ultraviolet radiation, Absorption, Bioalcohols, Diffusion, Photodetectors, Transmission electron microscopy, Gold

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