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人工晶体学报 ›› 2022, Vol. 51 ›› Issue (6): 1034-1041.

• 研究论文 • 上一篇    下一篇

SiW12、CsPbI3协同提高TiO2纳米管光电转换效率的研究

张博1, 蔺明宇1, 孙淑艳2, 罗新泽1   

  1. 1.伊犁师范大学化学与环境科学学院, 伊宁 835000;
    2.塔城地区质量与计量检测所,塔城 834700
  • 收稿日期:2022-01-14 出版日期:2022-06-15 发布日期:2022-07-18
  • 通讯作者: 罗新泽,博士,教授。E-mail:luo-xinze@163.com
  • 作者简介:张 博(1996—),男,内蒙古自治区人,硕士研究生。E-mail:m15894821437@163.com
  • 基金资助:
    国家自然科学基金(21361027);伊犁师范大学研究生科研创新项目(YSD202025)

SiW12 Cooperating with CsPbI3 to Improve the Photoelectric Conversion Efficiency of TiO2 Nanotubes

ZHANG Bo1, LIN Mingyu1, SUN Shuyan2, LUO Xinze1   

  1. 1. School of Chemistry and Environmental Science, Yili Normal University, Yining 835000, China;
    2. Institute of Quality and Metrology Inspection of Tacheng, Tacheng 834700, China
  • Received:2022-01-14 Online:2022-06-15 Published:2022-07-18

摘要: 为克服TiO2纳米管在光电转换时电子-空穴复合率高和吸收光谱范围窄的缺陷,利用多酸H4SiW12O40(SiW12)和CsPbI3量子点对其协同修饰,采用电沉积法将SiW12沉积在TiO2纳米管上,制备了SiW12/TiO2纳米管复合薄膜;使用高温热注射法合成出CsPbI3量子点,再通过化学浴沉积法沉积CsPbI3量子点到复合薄膜上,得到SiW12/CsPbI3/TiO2纳米管复合薄膜,探究SiW12沉积时间、CsPbI3沉积次数对TiO2纳米管光电性能的影响。利用扫描电子显微镜(SEM)、能谱仪(EDS)、透射电子显微镜(TEM)、X射线衍射(XRD)仪、红外分光光度计(FT-IR)、紫外-可见分光光度计(UV-Vis)对薄膜进行表征,使用电化学工作站测试薄膜的光电化学性能。结果表明:TiO2纳米管沉积多酸SiW12和CsPbI3量子点后,光吸收范围扩大、电荷转移电阻降低,光电转换效率得到显著提升,最高达到0.52%。说明SiW12和CsPbI3的协同作用很好地抑制了TiO2纳米管电子-空穴的复合,并拓宽了吸收光谱范围,提高了TiO2纳米管的光电转换效率。

关键词: 二氧化钛纳米管, 电子-空穴复合, 吸收光谱, 多酸, CsPbI3量子点, 复合薄膜, 光电转换效率

Abstract: In order to overcome the defects of high electron-hole recombination rate and narrow absorption spectrum range of TiO2 nanotubes during photoelectric conversion, TiO2 nanotubes were synergistically modified by polyoxometalates H4SiW12O40 (SiW12) and CsPbI3 quantum dots. SiW12/TiO2 nanotube composite films were prepared by electrodeposition of SiW12 on TiO2 nanotubes. The CsPbI3 quantum dots were synthesized by high temperature thermal injection method, and then the CsPbI3 quantum dots were deposited on the composite films by chemical bath deposition method to obtain the SiW12/CsPbI3/TiO2 nanotube composite films. The effects of SiW12 deposition time and CsPbI3 deposition frequencies on the photoelectric properties of TiO2 nanotubes were investigated. The films were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and ultraviolet visible spectrophotometer (UV-Vis). The photochemical properties of the films were tested by electrochemical workstation. The results show that the photoelectric conversion efficiency of TiO2 nanotubes deposited with polyoxometalates SiW12 and CsPbI3 quantum dots can be significantly improved by increasing the light absorption range and decreasing the charge transfer resistance up to 0. 52%. It shows that the synergistic effect of SiW12 and CsPbI3 can effectively inhibit the electron-hole recombination of TiO2 nanotubes, broaden the absorption spectrum and improve the photoelectric conversion efficiency of TiO2 nanotubes.

Key words: TiO2 nanotube, electron-hole recombination, absorption spectrum, polyoxometalate, CsPbI3 quantum dot, composite film, photoelectric conversion efficiency

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