染料敏化纳米晶MgO/TiO2薄膜太阳能电池

染料敏化TiO2薄膜太阳能电池被认为是硅基太阳能电池的潜在替代产品,但其光电转化效率较低.为了提高光电转化效率,采用物理吸附的方法,利用宽禁带半导体MgO对TiO2光阳极进行表面修饰.研究表明:大部分MgO进入到TiO2的表面结构中,复合薄膜形成的表面势垒改变了TiO2的禁带结构,有效的抑制了电池内部复合反应的进行,使电池的光电转化效率提高.MgO与TiO2之间的界面效应,增加了光在薄膜内的传输路径,使电池吸光度、染料吸附量增加.其中光电转化效率同未经修饰的染料敏化TiO2薄膜太阳能电池相比,提高了24.5%.

Nanocrystalline MgO/TiO2 Core-shell Film for Dye-sensitized Solar Cell

The dye-sensitized solar cell has been expected to replace the silicon-based solar cells, but the transformation efficiency is low. Improving the photoelectrical performance, the physical absorption was used and the TiO2 photo-anode was modified by doping the wide band gap semiconductor of MgO into TiO2 matrix. The re- suits indicate that most MgO could pass into the surface structure of TiO2 and effectively inhibit the charge recombi- nation because the energy barrier forming on the surface of the MgO/TiO2 core-shell film can change the structure of TiO2 forbidden band, the transformation efficiency was increased. The interface effect between MgO and TiO2 can increase the transmission path of light inside the core-shell film, so the absorbance and the absorption of N3 dye are enhanced. Especially, the transformation efficiency is increased 24.5 % compared with pure TiO2.