Abstract
In this work, front contacts for graphene-based solar cells are made by means of colloidal graphite instead of gold. The performance is characterized by exploiting impedance spectroscopy and is compared to the standard gold contact technology. Impedance data are analysed through equivalent circuit representation in terms of lumped parameters, suitable to describe the complex impedance in the frequency range considered in the experiments. Using this approach, capacitance–voltage of the considered graphene–silicon solar cell is found and the barrier height forming at the graphene–silicon interface is extracted.
Highlights
Among the numerous applications of graphene, the Schottky junction, which forms when it is deposited on crystalline silicon, has been proposed as cost-effective solar cell [1], with graphene acting as the metal of a metal–semiconductor (MS) junction
As a matter of fact, the total impedance which is measurable by accessing the external terminals of the device under test (DUT), is the superposition of several physical phenomena coexisting in the device
Fewlayers layers of graphene films were grown by chemical vapourvapour deposition (CVD) of(CVD)
Summary
Among the numerous applications of graphene, the Schottky junction, which forms when it is deposited on crystalline silicon, has been proposed as cost-effective solar cell [1], with graphene acting as the metal of a metal–semiconductor (MS) junction. The extracted circuit configurations for the two types of solar cells enabled us to isolate, from the global contact-graphene interface (gold–graphene in one case, or glue–graphene in the other case) impedance, the contributions given by the Schottky interface (graphene–silicon interface) and that of respectively. The knowledge of these contributions allowed us to extract the barrier height and the contact-graphene interface (gold–graphene in one case, or glue–graphene in the other case) respectively.
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