Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3232231
Keywords
band structure; cadmium compounds; II-VI semiconductors; nanostructured materials; photoconductivity; polymers; power conversion; semiconductor thin films; semiconductor-insulator boundaries; solar cells; wide band gap semiconductors; zinc compounds
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Funding
- AOP PV Program
- Department of Energy [DE-AC04-94AL85000]
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To improve zinc oxide/poly(3-hexylthiophene) (ZnO/P3HT) hybrid solar cell performance, we introduce a nanocrystalline cadmium sulfide (CdS) film at the ZnO/P3HT heterojunction, creating a cascading energy band structure. Current-voltage characteristics under AM1.5 illumination show that, compared to unmodified ZnO/P3HT devices, CdS modification leads to an approximate doubling of the open-circuit voltage and a mild increase in fill factor, without sacrificing any short-circuit current. These characteristics double the power conversion efficiency for devices with an interfacial CdS layer. External quantum efficiency spectra reveal definite photocurrent contributions from the CdS layer, confirming the cascading band structure. The mechanisms behind open-circuit voltage increase are discussed.
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