薄膜太阳能电池(thin film solar cell)精品.ppt

* * * * * * * * * * * * * * * * * * * 台湾西南海域天然气水合物赋存区地质调查研究，是一项四年期的科技计划，计划全程预定自93年1月起至96年12月止。 * * * * * * * * * * * * * * * * * * * * * * * * * * * Oxide Film--one of the major components in a DSSC Role of the oxide in a DSSC Receive electrons from the dye Efficient transport electrons in the media Characteristics Ultra fine structure(nm-crystal, mesoporous) interconnected (?) Good electrical conduction properties (?) Conduction band edge is more negative than HUMO of the dye ultra fine structure enable…. TiO2 nanoparticles Ref (17) Ref (3) IPCE% 0 0 100 0.15 300 800nm 300 800nm Single crystal anatase Nanocrystal anatase Common Materials and Processes of the Oxide film Material: TiO2(cheap, non-toxic), ZnO, Fe2O3, Nb2O5, WO3, Ta2O5, CdS, CdSe Common processes: TiO2film TiO2particles (Finely divided monodispersed colloidal) Coating, sintering Ti sault Process parameters: Precursor chemistry Hydrothermal growth Temp Binder addition Sintering condition Control: hydrolysis and condensation kinetics Factors influence properties: Material content Chemical composition Structure Surface morphology Grain size, porosity pore size distribution Crystalline form (anatase,rutile..) Hydrolysis solvent +binder (1-20?m) Electron Transport in the DSSC-- An important factor affecting IPCE De in the porous film De in the bulk crystal Multi-trapping model: electron transport is mediated by the conduction band and is interrupted by trapping. The traps could be formed byoxygen defects,amorphous layer on the particle surface,chemical surrounding, andlattice mismatch at boundaries. Injection electrons are slow down by trapping at the surface of the particle andmay back reaction through combination with I3- iron. Ref (18) Recent RDs of the Oxide Film in DSSC Method improving Contents Evaluation Ref. Design process *Nanocrystallite(TiO2,SnO2, ZnO..) coated with the shells of material(Al2O3,MgO, ZnO) *Column ZnO film (structure scale 100-500nm ) --electrodeposition, non-