Abstract
The present research work reports on the fabrication of ultraviolet (UV) photodetectors using bismuth ferrite (BiFeO3, BFO) thin films with varying thickness. Using the spray pyrolysis technique, BFO thin films were deposited on the glass substrate at 673 K. The deposited BFO thin films were characterized by Raman and FTIR spectroscopic analysis. The morphological analysis reveals uniform grain distribution for the prepared BFO samples. The optical analysis reveals that transmittance value decreases upon an increase in the thickness of BFO thin films and the calculated optical band gap value lies between 2.0 to 2.3 eV. The varying thickness of the BFO active layer was stacked between ITO and Al electrodes and the current–voltage (I–V) characteristics of the fabricated ITO/BFO/Al devices were studied under dark and UV illumination (λ = 365 nm). It was observed that BFO with an optimum thickness (365 nm) exhibits higher photoresponsivity of 110 mA/W with an external quantum efficiency (EQE) of 37.30%. The impact of different thickness of the BFO active layer, the role of adsorption and desorption of oxygen (O2) molecules upon the surface of BFO layers towards UV photoresponse characteristics were investigated.
Highlights
A photodetector is an optoelectronic device that converts the light energy into electrical energy and has potential applications in optical communication [1], spectroscopic instruments [2], defense operations [3], detection of moving objects [4], and in the biological field [5]
The photograph of the fabricated indium tin oxide (ITO)/BFO/Al photodetector and experimental set up used to study the photosensing characteristics is included as supplementary information
The low-frequency modes correspond to bismuth (Bi) and oxygen (O2) vibrations and the higher frequency modes correspond to Fe–O vibrations [24]
Summary
A photodetector is an optoelectronic device that converts the light energy into electrical energy and has potential applications in optical communication [1], spectroscopic instruments [2], defense operations [3], detection of moving objects [4], and in the biological field [5]. In the present research work, the BFO thin films with varying thickness were deposited using spray pyrolysis technique on a pre-cleaned ITO coated glass substrate. Device fabrication For the fabrication of BFO-based UV photodetector devices, the following steps were processed: indium tin oxide (ITO) was deposited on the ultrasonically cleaned glass substrate (2.5 cm × 2.5 cm) using the r.f magnetron sputtering method.
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