Journal
THIN SOLID FILMS
Volume 615, Issue -, Pages 300-304Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2016.07.040
Keywords
Thin films; Bismuth titanate; MFS photodiode; Current conduction; Steady-state photoconductivity
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Bismuth titanate, Bi4Ti3O12 (BiT), has proven to be a suitable candidate for electro-optical applications, therefore present study aims to report its utility as a photodiode material through current conduction and steady-state photoconductivity investigations. For this purpose, Al/p-Si diodes having thin film BiT interlayer (10 and 25 nm) were fabricated and current-voltage measurements were held in dark and under illumination. Among the samples, better current-voltage characteristics were obtained for the sample with 10 nm BiT interlayer. Deposition of BiT interlayer modified the current conduction mechanism in the forward bias region and interface-limited injection was reported for the diodes with BiT interlayer in the high forward biases. Variation of photocurrent with illumination intensity suggested a supralinear recombination process for the samples with BiT interlayer. High responsivity (2.891 A/W) and photosensitivity (7318.7) values were obtained for the sample with 10 nm BiT interlayer at 250 mW/cm(2) illumination intensity. Obtained results suggest that BiT interlayer (10 nm) can be utilized for visible light photodiode and photosensor applications. (C) 2016 Published by Elsevier B.V.
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