Study on thickness-dependence characteristics of bismuth ferrite (BFO) for ultraviolet (UV) photodetector application

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.

Synthesis of BiFeO3/ZnMgAl-LDH nanocomposite for instantaneous decolorization of methylene blue by ultrasonic induced adsorption system: characterization and equilibrium studies

“…But the modes related to Bi-O are located below 200, at 97 and 120. The position of Raman peaks is in good agreement with the previous study [53][54][55], and the results are consistent with XRD results.…”

Effect of Sr and Ti substitutions on optical and photocatalytic properties of Bi1−xSrxFe1−xTixO3 nanomaterials

“…The thickness of the films can also influence the photocurrents generated, with a notable decrease with increasing thickness. 33 Similar photocurrent density values were also reported in BFO-g-C 3 N 4 composite (∼0.4 μA cm −2 ) under an applied potential of 0.3 V. 34 …”

“…The thickness of the lms can also inuence the photocurrents generated, with a notable decrease with increasing thickness. 33 Similar photocurrent density values were also reported in BFO-g-C 3 N 4 composite (∼0.4 mA cm −2 ) under an applied potential of 0.3 V. 34 Further, under 450 nm excitation, the photocurrent generated in BFO-15%STO increases with the power density of the light (f 0 ) according to the classical power law (Fig. 7b).…”

Enhancement of Multiferroic and Optical Properties in BiFeO3 Due to Different Exchange Interactions Between Transition and Rare Earth Ions

“…These absorption peaks are usually caused by O–Fe–O bending vibrations and Fe–O stretching of the FeO 6 group in a perovskite structure. [ 5,57,58 ] The vibration of the Bi–O bond is responsible for the band at 1068 cm −1 . [ 59 ] The band observed around 1390 cm −1 is attributed to the symmetry bending vibration of C–H or C–H 2 and the vibration of the carbonyl group.…”

“…These absorption peaks are usually caused by O-Fe-O bending vibrations and Fe-O stretching of the FeO 6 group in a perovskite structure. [5,57,58] The vibration of the Bi-O bond is responsible Transmission % Wavenumber (cm -1 ) Figure 2. Fourier-transform infrared (FTIR) spectroscopy spectra of Bi 0.9 Tb 0.1 Fe 0.9 Mn 0.1 O 3 system.…”