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采用电化学沉积法在透明导电玻璃(FTO)基底上制备氧化锌(ZnO)纳米片,用KOH溶液刻蚀ZnO纳米片,得到多孔纳米片薄膜,再用化学浴沉积法(CBD)使CdS量子点沉积在ZnO纳米片表面,得Cd S敏化的多孔ZnO纳米片薄膜。利用X射线衍射仪、场发射扫描电子显微镜、高分辨率透射电子显微镜、电化学工作站研究了复合薄膜的晶体结构、形貌和光电性能。结果表明:KOH溶液刻蚀后的多孔ZnO纳米片光阳极的光电化学转换性能比ZnO纳米片有了明显的提高,光电化学转换效率随着刻蚀时间的延长先增大后减小,刻蚀时间30 min时,样品的光电转换效率提高为原来的7.2倍。多孔ZnO纳米片用Cd S量子点敏化后,Cd S量子点可以紧密、均匀地生长在多孔ZnO纳米片表面,并与ZnO纳米片形成异质结,其光电转换效率均有大幅度的提高,刻蚀60 min时的复合薄膜的光电转换效率最高,为1.176%,为量子点敏化太阳能电池的潜在应用提供实验基础。
Abstract：First, zinc oxide nanosheets were fabricated on a transparent conductive glass(FTO) substrate by electrochemical deposition. Then, the ZnO nanosheets were etched with KOH solution to obtain porous nanosheet films. The electrochemical deposition method was used to deposit CdS quantum dots onto the surface of ZnO nanosheets to obtain a CdS sensitized porous ZnO nanosheet film. The crystal structure, morphology, and photoelectric properties of the composite films were investigated by X-ray diffraction, field emission scanning electron microscopy, high resolution transmission electron microscope, and electrochemical workstation. The results show that the photoelectrochemical conversion performance of porous ZnO nanosheet photoanodes after KOH solution etching is significantly higher than that of ZnO nanosheets. The photoelectrochemical conversion efficiency first increases and then decreases with the etching time. The photoelectric conversion efficiency of the sample was increased by 7.2 times with 30 min of etching. After the porous ZnO nanosheets are sensitized with CdS quantum dots, the CdS quantum dots can be closely and uniformly grown on the surface of porous Zn O nanosheets and form heterojunctions with ZnO nanosheets. The photoelectric conversion efficiency was greatly improved. The highest photoelectric conversion efficiency of the composite film was 1.176% with an etching time of 60 min, which provides an experimental basis for the potential application of quantum dot sensitized solar cells.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2019.12.04
中图分类号:TM914.4
引用信息:
[1]田传进,赵文燕,陈雅楠,等.CdS量子点敏化ZnO纳米片的制备与光电性质[J].硅酸盐学报,2019,47(12):1711-1716.DOI:10.14062/j.issn.0454-5648.2019.12.04.
基金信息:
国家自然科学基金(51962015);; 江西省科技厅自然科学青年基金(20142BAB212006);; 景德镇市科技局青年基金(701301318,103037201);; 清华大学新型陶瓷与精细工艺国家重点实验室开放课题(KF201813,KF1211)
2019-07-06
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