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Current conduction and steady-state photoconductivity in photodiodes with bismuth titanate interlayer

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Publication date: 30 September 2016
Source:Thin Solid Films, Volume 615
Author(s): Mert Yıldırım
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 25nm) 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 10nm 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 (2.891A/W) and photosensitivity (7318.7) values were obtained for the sample with 10nm BiT interlayer at 250mW/cm2 illumination intensity. Obtained results suggest that BiT interlayer (10nm) can be utilized for visible light photodiode and photosensor applications.


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