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Author published in "Journal of the European Ceramic Society" affiliate to

College of Science and Engineering

Chi-Shun Tu

Department of Physics,

Fu Jen Catholic University, New Taipei City, Taiwan

Article published in 

"Journal of the European Ceramic Societ"  Volume 41, Issue 10, August 2021, Pages 5230-5239


Self-driven near-UV and visible light detection based on ITO/Gd-doped BiFeO3/Au heterostructure

Multiferroic BiFeO3 materials have driven great interest due to their potential in solar-spectrum energy harvesting, optoelectronic and photodetection devices. Here we report effects of electric-field poling on electronic hybridization and domain structure, and their correlations with photovoltaic responses in the ITO/(Bi0.93Gd0.07)FeO3 ceramic/Au heterostructure under 405 nm and 532 nm irradiations. Photovoltaic conversion, photoresponsivity (R) and specific detectivity (D*) are sensitive to ceramic thickness, photon energy, light intensity and electric-field poling. The photoresponsivity and detectivity in the 1 kV/cm poled photovoltaic cell under low-intensity 405 nm irradiation can respectively reach ∼4.5 × 10−2 A/W and 2.5 × 1011 Jones, which are larger than ∼2.8 × 10−2 A/W and 1.56 × 1011 Jones in the unpoled cell. This study demonstrates fast response times of ∼1 × 10−3 s and ∼2 × 10-2 s respectively under 405 nm and 532 nm irradiations. The improved photoresponse was driven jointly by the p-n junction, the field-modulated Schottky barriers and the network of grain boundaries and domain walls.[ Link to this article]

Fig. 1. (a,b) SEM grain morphology of thermally etched cross-sections         Fig. 2. (a) XRD patterns, (b) Fe L3-edge and (c) oxygen K-edge X-ray absorption spectraFig. 3. TEM images, SAED patterns and PNRs of (a,b) unpoled and (c-g) +1 kV/cm poled…

 

Keywords Photovoltaic conversion Polar nano-region Domain wall Photoresponsivity Specific detectivity Response time

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