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Position Dependent Photodetector From Large Area Reduced Graphene Oxide Thin Films

Surajit Ghosh, B. Sarker, A. Chunder, L. Zhai, S. Khondaker
Published 2010 · Materials Science, Physics

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We fabricated large area infrared photodetector devices from thin film of chemically reduced graphene oxide (RGO) sheets and studied their photoresponse as a function of laser position. We found that the photocurrent either increases, decreases, or remain almost zero depending upon the position of the laser spot with respect to the electrodes. The position sensitive photoresponse is explained by Schottky barrier modulation at the RGO film-electrode interface. The time response of the photocurrent is dramatically slower than single sheet of graphene possibly due to disorder from the chemical synthesis and interconnecting sheets.
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