Đang chuẩn bị liên kết để tải về tài liệu:
Solar Cells Dye Sensitized Devices Part 7

Tham khảo tài liệu 'solar cells dye sensitized devices part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 172 Solar Cells - Dye-Sensitized Devices the dye sensitized solar cell DSSC to imitate photosynthesis -the natural processes plants convert sunlight into energy- by sensitizing a nanocrystalline TiC 2 film using novel Ru bipyridl complex. In dye sensitized solar cell DSSC charge separation is accomplished by kinetic competition like in photosynthesis leading to photovoltaic action. It has been shown that DSSC are promising class of low cost and moderate efficiency solar cell see Table 2 and Figure 1 based on organic materials Gratzel 2003 Hara Arakawa 2003 . Semiconductor solar cells DSSC Transparency Opaque Transparent Pro-Envừonment Material Process Normal Great Power Generation Cost High Low Power Generation Efficiency High Normal Color Limited Various Table 1. Comparison between semiconductor based solar cell and the dye sensitized solar cell DSSC. In fact in semiconductor p-n junction solar cell charge separation is taken care by the junction built in electric field while in dye sensitizes solar cell charge separation is by kinetic competition as in photosynthesis Spath et al. 2003 . The organic dye monolayer in the photoelectrochemical or dye sensitized solar cell replaces light absorbing pigments chlorophylls the wide bandgap nanostructured semiconductor layer replaces oxidized dihydro-nicotinamide-adenine-dinucleotide phosphate NADPH and carbon dioxide acts as the electron acceptor. Moreover the electrolyte replaces the water while oxygen as the electron donor and oxidation product respectively Lagref. et al. 2008 Smestad Gratzel 1998 . The overall cell efficiency of dye sensitized solar cell is found to be proportional to the electron injection efficiency in the wide bandgap nanostructured semiconductors. This finding has encouraged researchers over the past decade. ZnC 2 nanowires for example have been developed to replace both porous and TiC 2 nanoparticle based solar cells Law et al. 2005 . Also metal complex and novel man made sensitizers have been .