title: The fabrication and analysis of a PbS nanocrystal:C(60) bilayer hybrid photovoltaic system.
abstract: 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.
authors.affiliation: Solid State Electronics Laboratory, University of Michigan, Ann Arbor, MI 48109-2122, USA. ndissa@umich.edu
authors.forename: D M N M
authors.initials: DM
authors.lastname: Dissanayake
authors.forename: R A
authors.initials: RA
authors.lastname: Hatton
authors.forename: T
authors.initials: T
authors.lastname: Lutz
authors.forename: R J
authors.initials: RJ
authors.lastname: Curry
authors.forename: S R P
authors.initials: SR
authors.lastname: Silva
mesh_terms: D003460:Crystallization / Q000379:methods*; D011211:Electric Power Supplies; D004867:Equipment Design; D019544:Equipment Failure Analysis; D037741:Fullerenes / Q000737:chemistry* / Q000528:radiation effects; D007854:Lead / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D010316:Particle Size; D013440:Sulfides / Q000737:chemistry* / Q000528:radiation effects; D013499:Surface Properties
chemical_list: D037741:Fullerenes; D046911:Macromolecular Substances; D013440:Sulfides; C018391:lead sulfide; D007854:Lead; C069837:fullerene C60