Abstract
Photoactivation of multiple carrier charge extraction in a tandem cell configuration is demonstrated. An all-solution-processed tandem photovoltaic structure, consisting of a hydrazine treated PbSe nanocrystal film and a P3HT/PCBM bulk-heterojunction solar cell, was fabricated. The PbSe nanocrystal film was used as the top cell to predominantly absorb short wavelength light (UV/blue). The lower P3HT/PCBM cell absorbed the remaining solar energy and supplied photocurrent as well as an electric field that extracts the photogenerated charge from the PbSe layer. Carrier multiplication from excitation of the PbSe film with high energy photons was quantified by selective light bias activation measurements.
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