TiO_(2)纳米晶空洞光阳极在染料敏化太阳能电池中的光电增效性能研究  

Photoelectric enhancement performance of TiO_(2) nanocrystalline cavity photoanode in dye-sensitized solar cells

作　　者：李振 乔伟强 于丽波 Li Zhen;Qiao Weiqiang;Yu Libo(College of Chemistry and Chemical Engineering,Hexi University,Zhangye 734000;Key Laboratory of Hexi Corridor Resources Utilization of Gansu,Hexi University,Zhangye 734000)

机构地区：[1]河西学院化学化工学院,张掖734000 [2]河西学院河西走廊特色资源利用重点实验室,张掖734000

出　　处：《化工新型材料》2024年第2期115-119,共5页New Chemical Materials

基　　金：国家自然科学基金地区基金项目(51862007);中科院西部之光青年学者项目(中科院人字(2022)4号);甘肃省青年博士基金项目(2022QB-156);甘肃省陇原青年创新创业人才项目(甘组通字(2021)17号)。

摘　　要：以含炭微球作为模板,制备了TiO_(2)纳米晶空洞光阳极用于染料敏化太阳能电池(DSSC),通过调整模板的添加量,实现了空洞数目在光阳极中的调控。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线衍射(XRD)分析了样品的形貌和结构。结果表明:基于TiO_(2)纳米晶空洞的DSSC,在标准太阳光强度(100mW/cm^(2))辐照下,最佳的短路电流密度(J_(sc))可以达到18.31mA/cm^(2),开路电压(V_(oc))为0.701V,填充因子(FF)为0.578,电池效率(PCE)达到7.4%,相比基于TiO_(2)纳米晶的DSSC 4.4%的电池效率,提高了68.18%,其中J_(sc)的显著提高是电池效率提升的主要因素。光散射、电子寿命的分析表明,适当的空洞结构可以增加光阳极对可见光的散射作用,通过可见光在空洞结构中的多次反射使染料能被多次激发产生光生电子,从而提升了光捕获效率和电子寿命,最终实现了DSSC性能的提高。TiO_(2) nanocrystalline cavity photoanode was prepared for dye-sensitized solar cells(DSSCs)using carbonaceous microspheres as templates.The number of cavities in the TiO_(2) nanocrystalline photoanode could be controlled by adjusting the amount of carbonaceous microspheres.The morphology and crystalline structure of the samples were analyzed by scanning electron microscopy(SEM),transmission electron microscopy(TEM)and X-ray diffraction(XRD).The results showed that DSSC based on TiO_(2) nanocrystalline cavities,under the irradiation of standard sunlight intensity(100mW/cm^(2)),achieved the optimal short-circuit current density(J_(sc))of 18.31mA/cm^(2),an open circuit voltage(V_(oc))of 0.701V,a filling factor(FF)of 0.578,and a power conversion efficiency(PCE)of 7.4%.In comparison with the 4.4%cell efficiency of DSSC based on TiO_(2) nanocrystalline,the PCE was increased by 68.12%,where the significant increase of J_(sc) was the main factor for the cell efficiency improvement.The analysis of light scattering and electron lifetime revealed that appropriate number of cavities in photoanode could enhance light scattering effect by multiple reflections of visible light and multiple excitations of dyes in the cavity structure to produce photogenerated electrons,which improved the light capture efficiency and electron lifetime,and finally led to the enhancement of DSSC performance.

关 键 词：染料敏化太阳能电池 纳米晶空洞 光阳极 含碳微球 

分 类 号：TB332[一般工业技术—材料科学与工程]