摘要
在量子点敏化太阳能电池(QDSCs)中,多孔二氧化钛(TiO2)光阳极薄膜在烧结过程中会产生很多微小裂纹,影响电子传输,导致太阳能电池性能下降。利用多壁碳纳米管(MWCNTs)独特的管状结构和良好的导电性能来优化TiO2光阳极薄膜内部的微裂纹,探究了不同质量分数(0%、0.01%、0.05%、0.10%、0.50%)的MWCNTs对量子点敏化太阳能电池MWCNTs/TiO2复合光阳极性能的影响。对光阳极进行物相及微观形貌分析表明:加入适量的MWCNTs可以与TiO2纳米颗粒均匀混合,并且MWCNTs贯穿了光阳极薄膜表面的微裂纹。但是过多的MWCNTs会聚集成团,引入大量缺陷。采用连续离子层沉积法在以上的光阳极表面沉积硫化镉(Cd S)量子点和硫化锌(ZnS)量子点阻隔层,以硫化铜(Cu S)为对电极,多硫电解液为电解质组装电池试样,测量其伏安特性(J-V)曲线。结果表明:添加0.05%MWCNTs的TiO2光阳极电池的光电性能最优,其开路电压和短路电流密度分别可达0.65 V和11.51 mA/cm^2,与未添加MWCNTs的光阳极电池相比,分别提高了16.1%和58.3%,其光电转化效率可达3.14%,提高了72.2%。
In quantum dot sensitized solar cells(QDSCs),many tiny cracks appear in porous titanium dioxide(TiO2)photoanode film during sintering process,which seriously blocks electron transport,leading to the significant decrease of solar cell performance.Multi-walled carbon nanotubes(MWCNTs)with the unique tuber structure and excellent electrical conductivity were used to modify the micro-cracks structure in TiO2 photoanode films.The effect of mass fraction(i.e.,0%,0.01%,0.05%,0.1%and 0.5%)of MWCNTs on the property of QDSCs photoanode was investigated.The crystal phase and micromorphology of photoanodes were characterized.According to the morphology analysis results,moderate MWCNTs and TiO2 nanocrystals are uniformly mixed,and MWCNTs penetrated the micro-cracks in photoanode films.However,excess MWCNTs would aggregate into clusters that introduce many defects.CdS and ZnS quantum dots(QDs)were prepared on the above-mentioned photoanodes by a successive ionic layer adsorption and reaction(SILAR)method.QDSCs were assembled using QDs sensitized MWCNTs/TiO2 photoanodes,CuS as a counter electrode and a polysulfide electrolyte as an electrolyte,and its volt-ampere characteristic(J-V)curve was measured.The results show that QDSCs with 0.05%MWCNTs/TiO2 photoanode have the optimum photoelectric performance(i.e.,the open-circuit voltage(Voc)of 0.65 V,the short-circuit current density(Jsc)of 11.51 mA/cm^2 and the power conversion efficiency(PCE)of 3.14%.
作者
王迪
王启明
孙洪全
王欣羽
张蔚
郑威
WANG Di;WANG Qiming;SUN Hongquan;WANG Xinyu;ZHANG Wei;ZHENG Wei(School of Material Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2020年第1期79-85,共7页
Journal of The Chinese Ceramic Society
基金
黑龙江省自然科学基金(E2018044)
哈尔滨市优秀学科带头人项目(2017RAXXJ078)。
关键词
多壁碳纳米管
量子点敏化太阳能电池
二氧化钛光阳极
电子传输
multi-walled carbon nanotubes
quantum dot-sensitized solar cells
titanium dioxide photoanode
electron transportation
