三元合金CdSe_xTe_(1-x)量子点敏化太阳能电池

Three Element Alloy CdSe_xTe_(1-x) Quantum Dots Sensitized Solar Cell

为了获得高光电转化效率的量子点敏化太阳能电池,我们制备了水相合金量子点CdSe_xTe_(1-x),通过直接吸附方法组装了量子点敏化太阳能电池,比较不同Se∶Te比例下CdSe_xTe_(1-x)电池的性能变化;当Se∶Te=2∶3时,CdSe_xTe_(1-x)敏化太阳能电池各种性能最佳,其光电转换效率可达2.47%。相比于同条件制备的水相Cd Se和Cd Te量子点敏化太阳能电池转换效率分别提升了90%和70%。进一步改善CdSe_xTe_(1-x)量子点表面修饰,抑制电池暗电流,在使用液态多硫电解液的环境下,获得了填充因子为72.7%的CdSe_xTe_(1-x)量子点敏化电池。

To prepare QDSSCs（Quantum Dots Sensitized Solar Cells）with high photoelectric conversion efficiency , aqueous alloys CdSexTe1- x QDs and CdSexTe1- x QDSSCs have been designed. The performance of CdSexTe1-x QDSSCs changes in different Se：Te ratios assembled;when Se：Te=2：3,the performance of CdSexTe1-x QDSSCs is the best. Sensitized solar cells prepared in the condition of photoelectric conversion efficiency are up to 2.47%. The conversion efficiencies are improved 90%and 70%respectively,compared with that of CdSe and CdTe QDSSCs in the same conditions. On the basis of this, it is true that the surface modification of CdSexTe1-x QDs would be controlled by changing the route of preparation. With this method,the occurrence of dark current is further suppressed. Under the condition of using the liquid sulfur electrolyte,the sample of the QDSSCs with a filling factor of 72.7%is obtained.