CoAl_2O_4粉体制备及在染料敏化太阳电池中的应用  

Preparation of spinel CoAl_2O_4 nanopowders and their applications to DSSC

作　　者：胡志强[1,2] 秦颖[1] 姜妍彦[1] 郝洪顺[1] 高宏[2] 

机构地区：[1]大连工业大学,新能源材料研究所,辽宁大连116034 [2]大连交通大学,材料科学与工程学院,辽宁大连116028

出　　处：《光学精密工程》2013年第8期2016-2022,共7页Optics and Precision Engineering

基　　金：国家863高技术研究发展计划资助项目(No.2006AA05Z417);大连市科技平台资助项目(No.2010-354)

摘　　要：采用向太阳电池光阳极中复合窄禁带半导体材料的方法来提高光阳极的光响应范围,以改善染料敏化太阳能电池的性能。用柠檬酸凝胶法制备CoAl2O4纳米粉体,并通过X-射线衍射光谱分析煅烧温度对CoAl2O4纳米粉体晶型及晶粒的影响规律;采用透射电镜观察CoAl2O4纳米粉体的表面形貌;通过紫外-可见吸收光谱分析CoAl2O4纳米粉体和CoAl2O4/TiO2复合多孔纳米薄膜的吸光度,并计算了CoAl2O4纳米粉体的禁带宽度。以CoAl2O4/TiO2复合薄膜为光阳极制备了染料敏化太阳电池(DSSC),应用太阳光模拟器及数字源表测试了DSSC的光电性能,分析了CoAl2O4的复合量对DSSC光电性能的影响规律。实验结果表明:CoAl2O4粉体的最佳烧结温度为700℃;CoAl2O4粉体的禁带宽度为1.69eV,属于窄禁带半导体材料;当CoAl2O4的复合量为1%时,电池性能较好,转化效率提高了62%。另外,CoAl2O4/TiO2复合薄膜电池的稳定性比纯TiO2薄膜电池好。得到的结果说明向TiO2中复合CoAl2O4粉体可以提高电池的转化效率。Abstract： Narrow band gap semiconductor materials were composited to a photoanode to improve its light response characteristics and the photoelectric conversion properties of dye-sensitized solar cells （DSSCs）. The citric acid gel method was used to prepare the COA1204 nanopowders and the X-ray dif- fraction spectra were utilized to analyze the effect of roasting temperature on crystal structures and particle sizes. Then, the surface morphology of COA1204 was observed by transmission electron mi- crocopy, the absorbances of COA1204 nanopowders and CoA1204/TiO2 porous composite films were tested by UV-visible absorption spectroscopy and the band gaps of CoAl2 04 nanopowders were calcu- lated. By using CoA1204/TiOz composite films as the photoanode, the DSSC was prepared. The opti- cal performance of the DSSC was tested by a solar simulator and a SourceMeter and the influence of doping CoAl2 04 on the photoelectric properties of a DSSC was investigated. The results show that the optimum roasting which means that temperature of COA1204 powders is 700 ℃ and its band gap energy is 1.69 eV, it is a narrow band gap semiconductor material. Moreover, the performance of DSSC is the best and the conversion efficiency improves by 62% when the amount of CoA1204 powder is 1%（weight percentage）. The stability of the CoA1204/TiO2 composite thin film cells is better than that of the pure TiO2 thin film cell. These results demondtrate that compositing CoA1204 to TiO2 can improve the conversion efficiencies of DSSCs.

关 键 词：CoAl2O4 粉体制备 溶胶凝胶法 染料敏化太阳能电池 光电转换效率 

分 类 号：TB321[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]