Ag_2Se量子点共敏化固态染料敏化太阳能电池光电性能研究  

Photovoltaic Performance of Ag_2Se Quantum Dots Co-sensitized Solid-state Dye-sensitized Solar Cells

作　　者：杨英 潘德群 张政 陈甜 韩晓敏 张力松 郭学益 YANG Ying;PAN De-Qun;ZHANG Zheng;CHEN Tian;HAN Xiao-Min;ZHANG Li-Song;GUO Xue-Yi(School of Metallurgy and Environment,Central South University,Changsha 410083,China;Hunan Key Laboratory of Nonferrous Metal Resources Recycling,Changsha 410083,China;Hunan Engineering Research Center of Nonferrous Metal Resources Recycling,Changsha 410083,China)

机构地区：[1]中南大学冶金与环境学院,长沙410083 [2]有色金属资源循环利用湖南省重点实验室,长沙410083 [3]有色金属资源循环利用湖南省工程研究中心,长沙410083

出　　处：《无机材料学报》2019年第2期137-144,共8页Journal of Inorganic Materials

基　　金：国家自然科学基金(61774169);中南大学创新驱动计划项目(2016CX022);中南大学研究生创新项目(1053320170116;1053320170565);中南大学本科生创新项目(cx20170271;201710533300);留学回国基金资助以及湖南省自然科学基金(2016JJ3140)~~

摘　　要：采用水相共沉积法制备Ag_2Se量子点(QDs),并与染料共敏化制备固态染料敏化太阳能电池(DSSCs)。考察了Ag_2Se量子点不同敏化方式(TiO_2/N719/QDs, TiO_2/QDs/N719)及敏化时间(0～5 h)对DSSCs性能的影响。通过透射电子显微镜(TEM)和紫外-可见光谱图(UV-Vis)对Ag_2Se量子点结构及光学性质进行了表征;采用光调制光电流/电压谱(IMPS/VS)以及交流阻抗谱(EIS)对器件中载流子传输过程进行了研究。TiO_2/QDs/N719的电池器件比TiO_2/N719/QDs具有更高的单色光量子转化效率(IPCE)及光电转化效率,这是由于TiO_2/QDs/N719可以吸附更多的量子点和染料。随着Ag_2Se量子点敏化时间的延长,光电转化效率先提高后降低,最高达到3.97%。Ag_2Se量子点在器件中起到了阻挡层作用,可以促进电子传输,抑制电子-空穴复合。而随着量子点敏化时间超过2h,电子陷入陷阱的几率增加,导致器件的光伏性能下降。Ag2Se quantum dots(QDs)was synthesized by co-deposition method which was further applied as co-sensitizer in solid-state dye-sensitized solar cells(DSSCs).The effects of different sensitization methods of Ag2Se QDs(TiO2/N719/QDs,TiO2/QDs/N719)and sensitization time(0-5 h)on the performance of QDs/dye co-sensitized solar cells were studied.Structure and optical properties of Ag2Se QDs were characterized by transmission electron microscopy(TEM)and ultraviolet-visible spectroscopy(UV-Vis).Furthermore,the transmission of charge carriers of solar cell devices was characterized by photo-modulated photocurrent/voltage spectrum(IMPS/VS)and electrochemical impedance spectra(EIS).It was found that the device with TiO2/QDs/N719 showed higher incident photon-to-current efficiency(IPCE)and photoelectric efficiency than those of TiO2/N719/QDs,which was due to the fact that TiO2/QDs/N719 photoanode adsorbed more QDs and dyes.With the extension of Ag2Se QDs sensitization time,the photovoltaic properties of DSSCs firstly ascended and then descended,achieving the highest photoelectric conversion efficiency 3.97%.The incorporation of Ag2Se QDs could effectively promote the electron transport and inhibit the electron-hole recombination,which benefited from a blocking layer that QDs served in device.As sensitization time prolonged over 2 h,the photovoltaic performances of device deteriorated,which was attributed to the augmented trap sites in Ag2Se QDs layer.

关 键 词：Ag2Se量子点 水相共沉积法 共敏化 染料敏化太阳能电池 

分 类 号：TM914[电气工程—电力电子与电力传动]