Spray-pyrolyzed vs spin-cast titania films in bilayer hybrid solar cells with a small-molecular hole transporting dye
(English)Manuscript (preprint) (Other academic)
Titania films as acceptor layer in bilayer hybrid solar cell devices were prepared by spray-pyrolysis and by spin-casting. Both preparation methods resulted in anatase titania films with similar optical and electronic properties. Spray pyrolysis resulted in dense TiO2 films grown onto the conducting glass substrates while spin-casting gave rise to titania films with a nanoporous morphology. Hybrid solar cell devices with varying layer thickness of the small molecular semiconducting dye TDCV-TPA were investigated. Devices built with spray-pyrolyzed titania substrates yielded conversion effiencies up to 0.47 %, limited by the exciton diffusion length in TDCV-TPA. Spin-cast titania substrates exhibited short circuits for devices with thin dye layer thickness but gave up to 0.6 % conversion efficiency for thicker dye layers due to the higher interfacial area for charge separation and the dye acting as an insultator.
spray-pyrolysis, spin-casting, TiO2, hybrid solar cell
IdentifiersURN: urn:nbn:se:uu:diva-168480OAI: oai:DiVA.org:uu-168480DiVA: diva2:498335