Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
We implemented a low-temperature approach to fabricate efficient photoanodes for Dye Sensitized Solar Cells which combines three different nano-architectures, namely a highly conductive and highly transparent AZO film, a thin TiO2-blocking layer and a mesoporous TiO2 nanorods-based working electrode. All the components were processed at T≤200°C. Both the AZO and TiO2 compact layers were deposited by reactive sputtering, whereas the TiO2 nanorods were synthesized by surfactant-assisted wet-chemical routes and processed into photoelectrodes in which the native geometric features assured uniform mesoporous structure with effective nanocrystal interconnectivity suitable to maximize light harvesting and electron diffusion. Due to the optimised structure of the TiO2-blocking/AZO bilayer as well as to the good adhesion of the TiO2 nanorods over it, a significant enhancement of the charge recombination resistance was demonstrated, this laying on the basis of the outstanding power conversion efficiency achievable through the use of this photoanode’s architecture: a value of 4.6% (N719) was achieved with a 4mm-thick electrode processed at T=200°C. This value noticeably overcomes the current literature limit got on AZO-based cells (N719) which instead use Nb-doped and thicker blocking layers, and thicker nanostructured photoanodes which have been even sintered at higher temperatures (450-500°C).
LOW TEMPERATURE DSSC. J-V and IPCE analyses related to the TiO2 nanorods/ TiO2-blocking/AZO bilayer –based DSSC having the TiO2-blocking/AZO bilayer left as deposited or treated at 200°C. For comparison, a reference cell with the TiO2 nanorods deposited on FTO is also reported. The nanorods layer thickness is 4microns. The maximum registered efficiency was 4.57%. The current maximum efficiency value reported in the literature for AZO based DSSC is 3.8 % (for 10microns nanopastes, sintered at 450°C, and sensitised by N719). TEM and SEM analyses of the blocking-TiO2/AZO and of the TiO2 nanorods layers , respectively, are also reported.
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