title: Solution processed Al-doped ZnO nanoparticles/TiOx composite for highly efficient inverted organic solar cells.
abstract: We investigated the electrical properties of solution processed Al-doped ZnO (AZO) nanoparticles, stabilized by mixing with a TiOx complex. Thin solid films cast from the solution of AZO-TiOx (AZOTi) (Ti/Zn ∼0.4 in the bulk and ∼0.8 on its surface) is processable in inert environment, without a need for either ambient air exposure for hydrolysis or high temperature thermal annealing commonly applied to buffer layers of most metal-oxides. It was found that the electronic structure of AZOTi matches the electronic structure of several electron acceptor and donor materials used in organic electronic devices, such as solar cells. Inverted solar cells employing a bulk heterojunction film of poly(3-hexylthiophene) and phenyl-C61-butyric acid methyl ester, cast on an indium-tin-oxide/AZOTi electrode, and capped with a tungsten oxide/aluminum back electrode, give rise to a nearly 70% fill factor and an optimized open-circuit voltage as a result of efficient hole blocking behavior of AZOTi. The resulting electron collecting/blocking capability of this material solves crucial interfacial recombination issues commonly observed at the organic/metal-oxide interface in most inverted organic bulk heterojunction solar cells.
authors: Department of Chemistry, University of North Carolina at Chapel Hill , Caudill and Kenan Laboratories CB 3290, Chapel Hill, North Carolina 27599, United States.
authors: Abay
authors: A
authors: Gadisa
authors: Travis
authors: T
authors: Hairfield
authors: Leila
authors: L
authors: Alibabaei
authors: Carrie L
authors: CL
authors: Donley
authors: Edward T
authors: ET
authors: Samulski
authors: Rene
authors: R
authors: Lopez
mesh_terms: D004566:Electrodes; D053768:Metal Nanoparticles / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry*; D012993:Solar Energy; D013876:Thiophenes / Q000737:chemistry; D017971:Tin Compounds / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D009930:Organic Chemicals; D013876:Thiophenes; D017971:Tin Compounds; C507295:poly(3-hexylthiophene); C009495:titanium dioxide; C109984:indium tin oxide; D014025:Titanium; D015034:Zinc Oxide