基于氧化物异质结的量子点敏化太阳电池

QUANTUM DOTS SENSITIZED SOLAR CELLS BASED ON OXIDE HETEROJUNCTION

将半导体钒酸铋(BiVO4)作为光俘获材料,采用连续离子层吸附和反应法(SILAR)将其沉积在纳米晶TiO2多孔薄膜上并用作光阳极制备液态量子点敏化太阳电池。利用紫外可见吸收光谱、XRD和TEM等表征手段深入研究BiVO4前驱体溶液的浓度、离子沉积次数以及浸泡处理时间对BiVO4敏化的TiO2薄膜的影响及机理。结果表明:采用Bi(NO3)3·5H2O和NH4VO3的水溶液作为前驱体溶液时,当NH4VO3水溶液的pH=3,连续沉积20次后,电池具有最佳光伏性能:电池短路电流密度为1.78mA/cm2,光电转换效率达到0.32%。结果表明,BiVO4作为光俘获材料,在量子点敏化太阳电池中具有潜在的应用前景。

The nanocrystalline porous TiO2 film sensitized ware prepared by a simple successive ionic layer with bismuth Vanadate （ BiVO4 ） quantum dots （QDs） adsorption and reaction deposition technique （SILAR）. The influence of the concentration of the reactant solutions, number of ion-deposition cycles and the treatment time on the kinetics of layer growth on TiO~ films were studied by UV-vis, XRD, and TEM techniques. When Bi（ NO3 ）3-5 H2O and NH4VO3 were used as the reactants, with pH = 3, the number of ion-deposition cycles are 20, the assembled BiVO4 solar ceils yield a power conversion efficiency of 0. 32% and a short-circuit current density of 1.78mA/cm2 under AM 1.5 illumination. It is found that BiV04 can be used as an efficient sensitizer for solar cells.