CdSe/CdS量子点共同敏化TiO_2纳米管阵列光阳极研究

Study on CdSe/CdS quantum dots co-sensitized TiO_2 nanotubes photo-anode

为了探究量子点共敏化对TiO_2纳米管阵列太阳能电池的光电转换效率的影响,采用连续离子层沉积法制备了不同循环沉积次数的Cd Se量子点敏化和Cd Se/Cd S量子点共敏化TiO_2纳米管阵列光阳极,并采用能谱分析、扫描电子显微镜、X射线衍射、紫外吸收光谱等方法对光阳极进行了表征。以制得的光阳极组装了太阳能电池,并对其光电转换效率和伏安特性进行了测试。研究结果表明:制备的Cd Se/Cd S量子点共敏化太阳能电池比Cd Se量子点单独敏化的太阳能电池更有效地吸收长波太阳光,在波长为575 nm处最大光电转化效率达到35.3%,对640 nm波长的光仍然有超过10%的量子效率;最大短路电流密度为5.45 m A/cm2,开路电压为0.64 V,光电转换效率达到1.95%,Cd Se/Cd S量子共敏化太阳能电池光电转换效率比Cd Se量子点单独敏化的提高了约2倍。

In order to investigate the effect of quantum dot co-sensitization on the photoelectric conversion efficiency of TiO2 nanotube array solar cells, CdSe quantum dots sensitized TiO2 nanotubes photo-anode and CdSe/CdS quantum dots co-sensitized TiO2 nanotubes photo-anode were synthesized using successive ionic layer adsorption and reaction method. Energy spectrum, scanning electron microscope, X ray diffraction and UV-Vis aly^rption spectrum were used for the characterization of the sensitized TiO2 nanotube sphoto-anode. The prepared photo-anodes were used to assembled solar cells, and the photovohaic-conversion efficiency and volt-ampere characteristics were measured. The results showed that CdSe/CdS quantum dots co-sensitized photo-anode was more effective than CdSe quantum dots sensitized photo-anode in long-wavelength light absorption. The maximum incident photon to current efficiency was 35. 5% at the 575 nm wavelength; while at 640 nm, the quantum efficiency was still over 10%. The short-circuit currentdensity was 5.45 mA/cm2, open-circuit voltage was 0.64 V, the photoelectric conversion efficiencywas 1.95% , which was about two times to that of CdSe quantum dots sensitized solar cell.