摘要
为克服TiO_(2)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H_(4)SiW_(12)O_(40)(SiW_(12))和CsPbI_(3)量子点对其协同修饰,采用电沉积法将SiW_(12)沉积在TiO_(2)纳米管上,制备了SiW_(12)/TiO_(2)纳米管复合薄膜;使用高温热注射法合成出CsPbI_(3)量子点,再通过化学浴沉积法沉积CsPbI_(3)量子点到复合薄膜上,得到SiW_(12)/CsPbI_(3)/TiO_(2)纳米管复合薄膜,探究SiW_(12)沉积时间、CsPbI_(3)沉积次数对TiO_(2)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:TiO_(2)纳米管沉积多酸SiW_(12)和CsPbI_(3)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SiW_(12)和CsPbI_(3)的协同作用很好地抑制了TiO_(2)纳米管电子-空穴的复合,并拓宽了吸收光谱范围,提高了TiO_(2)纳米管的光电转换效率。
In order to overcome the defects of high electron-hole recombination rate and narrow absorption spectrum range of TiO_(2) nanotubes during photoelectric conversion,TiO_(2) nanotubes were synergistically modified by polyoxometalates H_(4)SiW_(12)O_(40)(SiW_(12))and CsPbI_(3) quantum dots.SiW_(12)/TiO_(2) nanotube composite films were prepared by electrodeposition of SiW_(12) on TiO_(2) nanotubes.The CsPbI_(3) quantum dots were synthesized by high temperature thermal injection method,and then the CsPbI_(3) quantum dots were deposited on the composite films by chemical bath deposition method to obtain the SiW_(12)/CsPbI_(3)/TiO_(2) nanotube composite films.The effects of SiW_(12) deposition time and CsPbI_(3) deposition frequencies on the photoelectric properties of TiO_(2) 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 TiO_(2) nanotubes deposited with polyoxometalates SiW_(12) and CsPbI_(3) 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 SiW_(12) and CsPbI_(3) can effectively inhibit the electron-hole recombination of TiO_(2) nanotubes,broaden the absorption spectrum and improve the photoelectric conversion efficiency of TiO_(2) nanotubes.
作者
张博
蔺明宇
孙淑艳
罗新泽
ZHANG Bo;LIN Mingyu;SUN Shuyan;LUO Xinze(School of Chemistry and Environmental Science, Yili Normal University, Yining 835000, China;Institute of Quality and Metrology Inspection of Tacheng, Tacheng 834700, China)
出处
《人工晶体学报》
CAS
北大核心
2022年第6期1034-1041,共8页
Journal of Synthetic Crystals
基金
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)。
