Preparation of La-doped BiFeO3 Thin Film and Its Photovoltaic Properties

doi:10.3724/SP.J.1077.2013.12298

Abstract

Abstract:

The La³⁺ doped BiFeO₃ (BFO) thin films were fabricated by Sol-Gel method. The precursor solution was synthesized by dissolving Bi(NO₃)₃, Fe(NO₃)₃ and La(NO₃)₃ in 2-methoxyethanol and BiFeO₃ thin films were grown by chemical solution deposition on fluorine doped tin oxide (FTO) glass substrate. The influence of La³⁺ doping on the band gap and photovoltaic properties of BiFeO₃ was studied. The BiFeO₃ thin films exhibited polycrystalline-phase perovskite structure. The lattice parameter of BiFeO₃ decreased with La³⁺ addition increasing. The band gap of BiFeO₃ doped with 10% La³⁺ doping was 2.71 eV, a little smaller than that of the undoped one. The bandgap of BiFeO₃ increased to 2.76 eV with the increase of La³⁺ doping. The maximal open circuit voltage of 10% La³⁺-doped BiFeO₃ prepared by modified method reached 0.4 V, showing good photovoltaic properties.

Key words: Sol-Gel method, bismuth ferrite, open circuit voltage, lanthanum doping

CLC Number:

TB34

XIE Yi-Jun, GUO Yi-Ping, DONG Wen, GUO Bing, LI Hua, LIU He-Zhou. Preparation of La-doped BiFeO₃Thin Film and Its Photovoltaic Properties[J]. Journal of Inorganic Materials, 2013, 28(4): 436-440.

Figures/Tables 9

Fig. 1 XRD patterns of BFO thin films doped with different contents of La3+

Fig. 1 XRD patterns of BFO thin films with different

Fig. 2 SEM images of (a) undoped and (b) doped with 10% La3+ BFO films

Fig. 3 Transmission spectra of BFO thin films doped with different contents of La3+

Fig. 4 Plots of (αhν)2 vs hν for BFO thin films doped with different contents of La3+

Fig. 5 J-V curves of BFO thin films doped with different contents of La3+

Fig. 6 J-V curve of BFO thin film using the modified method under dark and white light illumination

Fig. 7 Time dependence of zero bias photocurrent density with light ON and OFF of BFO thin film using the modified method

content of La3+ content of La3+

References 18

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Preparation of La-doped BiFeO₃Thin Film and Its Photovoltaic Properties

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