TiO2/CuInS2复合纳米棒阵列的制备及其光电性能

doi:10.3724/SP.J.1077.2012.00049

摘要/Abstract

摘要：

采用两步溶剂热法在氧化氟锡(FTO)导电玻璃基底上制备了CuInS₂敏化TiO₂纳米棒阵列复合薄膜光阳极.利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)表征了复合阵列薄膜的晶体结构和表面形貌, 同时采用紫外-可见吸收分光光度计(UV-Vis)及光电流-电压(I-V)曲线研究了CuInS₂敏化TiO₂纳米阵列薄膜的光学及光电化学性质. 研究结果表明, TiO₂纳米棒阵列薄膜被CuInS₂敏化后在可见光区的吸收有明显的增强. 在模拟太阳光照射下 (100 mW/cm²), 利用这种复合薄膜作为光阳极组装的量子点敏化太阳能电池的开路电压为0.29 V, 短路电流密度为0.15 mA/cm², 具有一定的光电转换能力.

关键词: TiO₂纳米棒阵列, CuInS₂, 溶剂热, 光电转换, 量子点

Abstract:

Vertically oriented single-crystalline TiO₂ nanorod arrays sensitized with CuInS₂ quantum dots (QDs) were synthesized directly on fluorine-doped tin oxide (FTO) substrates by two-step solvothermal method. The as-prepared nanostructure assembly was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results indicated that CuInS₂ QDs were uniformly covered on the surface of the single-crystalline TiO₂ nanorods. Ultraviolet visible (UV-Vis) absorption spectra showed that the absorbance of the TiO₂/CuInS₂ nanocomposite film was extended to the visible region. Under illumination of simulated AM 1.5 G (100 mW/cm²) at one sun intensity, the QD sensitized solar cells (QD-SSCs) assembled with FTO/TiO₂/CuInS₂ photoelectrodes exhibited an open-circuit voltage of 0.29 V and a short-circuit current density of 0.15 mA/cm².

Key words: TiO₂ nanorods array, CuInS₂, solvothermal, photo-electric conversion, quantum dots (QDs)

中图分类号:

TB383

范俊奇, 周正基, 周文辉, 武四新. TiO₂/CuInS₂复合纳米棒阵列的制备及其光电性能[J]. 无机材料学报, 2012, 27(1): 49-53.

FAN Jun-Qi, ZHOU Zheng-Ji, ZHOU Wen-Hui, WU Si-Xin. Fabrication of CuInS₂ Sensitized TiO₂ Nanorod Arrays for Photovoltaic Devices[J]. Journal of Inorganic Materials, 2012, 27(1): 49-53.

图/表 5

图1 CuInS2敏化TiO2纳米棒阵列前后的XRD图谱

Fig. 1 XRD patterns of TiO2 / CuInS2 nanorod arrays

图2 CuInS2敏化TiO2纳米棒阵列前后的SEM照片

Fig. 2 SEM images of TiO2/CuInS2 nanorod arrays

图3 CuInS2敏化TiO2复合纳米棒阵列的紫外-可见吸收光谱

Fig. 3 UV-Vis absorbance spectra of TiO2/CuInS2 composite nanorod array film (a) TiO2, (b) TiO2/CuInS2 composite nanorod array film

图4 CuInS2敏化TiO2的纳米棒阵列太阳能电池的光电流-电压曲线

Fig. 4 Photocurrent-voltage characteristics of TiO2/CuInS2 solar cells

图5 光生载流子在CuInS2/TiO2界面的转移示意图

Fig. 5 Schematic diagram showing the charge-transfer processes for the CuInS2/TiO2 heterostructure

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TiO₂/CuInS₂复合纳米棒阵列的制备及其光电性能

Fabrication of CuInS₂ Sensitized TiO₂ Nanorod Arrays for Photovoltaic Devices

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