Space charge limited conduction with exponential trap distribution in reduced graphene oxide sheets

Details Space charge limited conduction with exponential trap distribution in reduced graphene oxide sheets Space charge limited conduction with exponential trap distribution in reduced graphene oxide sheets

2010-06-23

arxiv.org/abs/1006.4430v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 3 figures, 1 table

Scientific paper

We elucidate on the low mobility and charge traps of the chemically reduced graphene oxide (RGO) sheets by measuring and analyzing temperature dependent current-voltage characteristics. The RGO sheets were assembled between source and drain electrodes via dielectrophoresis. At low bias voltage the conduction is Ohmic while at high bias voltage and low temperatures the conduction becomes space charge limited with an exponential distribution of traps. We estimate an average trap density of 1.75x10^16 cm^-3. Quantitative information about charge traps will help develop optimization strategies of passivating defects in order to fabricate high quality solution processed graphene devices.

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