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Nanotechnology. 2009 Jun 17;20(24):245202. doi: 10.1088/0957-4484/20/24/245202. Epub 2009 May 26.

The fabrication and analysis of a PbS nanocrystal:C(60) bilayer hybrid photovoltaic system.

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  • 1Solid State Electronics Laboratory, University of Michigan, Ann Arbor, MI 48109-2122, USA. ndissa@umich.edu


A near-infrared sensitive hybrid photovoltaic system between PbS nanocrystals (PbS-NCs) and C(60) is demonstrated. Up to 0.44% power conversion efficiency is obtained under AM1.5G with a short circuit current density (J(sc)) of 5 mA cm(-2) when the PbS-NC layer is treated in anhydrous methanol. The observed J(sc) is found be approximately one-third of the maximum expected from this hybrid configuration, indicating the potential for further optimization. Crucial for device operation, a smooth film of nanocrystals is seen to form on the hole transporting poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) layer deposited on the transparent electrode, facilitated through an ionic interaction between nanocrystal capping ligands and the PEDOT:PSS. The formation of the open circuit voltage in this system is seen to be influenced by an interfacial dipole formed at the hole-extracting electrode, providing insights for further optimization.

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