The fabrication and analysis of a PbS nanocrystal: C60 bilayer hybrid photovoltaic system

D. M N M Dissanayake, R. A. Hatton, T. Lutz, R. J. Curry, S. R P Silva

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A near-infrared sensitive hybrid photovoltaic system between PbS nanocrystals (PbS-NCs) and C60 is demonstrated. Up to 0.44% power conversion efficiency is obtained under AM1.5G with a short circuit current density (Jsc) of 5mAcm-2 when the PbS-NC layer is treated in anhydrous methanol. The observed Jsc 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.

    Original languageEnglish
    Article number245202
    JournalNanotechnology
    Volume20
    Issue number24
    DOIs
    Publication statusPublished - 2009

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