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Toward Graphene-Based Photovoltaics – Liang-shi Li

Date: Mon. March 28th, 2011, 12:30 pm-1:30 pm
Location: Rockefeller 221

Solution-processable thin-film solar cells can be competitive with silicon-based ones in terms of electricity output/cost ratio and therefore have great potential in solar energy utilization. Due to the requirement for efficient light harvesting, however, so far the most successful low-cost thin-film solar cells require materials containing either rare or toxic metals. In my talk I will discuss our efforts in making graphene, which is primarily made of carbon, an active component for solar energy conversion. Our work is based on the synthesis of solution-processable colloidal graphene quantum dots with tunable size and bandgap. Our spectroscopic studies have shown that the graphene quantum dots have some unique electro-optical properties, which could potentially enable us to overcome the Shockley-Queisser limit imposed on single-junction solar cells.

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