CAJ | 학술논문

以十六烷基三甲基溴化铵(CTAB)为模板剂,通过TiCl4在乙醇水溶液中的直接水解,制备了介孔TiO2微球. X射线衍射(XRD)结果表明所制备的微球晶型为金红石,扫描电镜(SEM)结果显示微球的直径大约为700 nm,由粒径约为16 nm的小颗粒堆积而成.通过刮涂法制备了在TiO2小颗粒层上涂覆有作为散射层的TiO2微球和未涂覆微球的薄膜.并通过化学浴沉积(CBD)的方法在膜上生长CdS/CdSe量子点,得到了量子点敏化太阳能电池(QDSCs).紫外吸收和漫反射结果表明,这种微球结构有利于量子点的沉积,具有较强的光散射作用,有效地增加了光线的收集,从而提高了电池的光电流,最终得到了4.5%的光电转换效率,比不加散射层的电池的效率高27.7%,也比利用传统散射层(由20 nm TiO2小颗粒和400 nm TiO2固体颗粒组成)的电池效率高10.2%.我们把电池效率的提升归因于较强的光散射作用和较长的电子寿命.
이십륙완기삼갑기추화안(CTAB)위모판제,통과TiCl4재을순수용액중적직접수해,제비료개공TiO2미구. X사선연사(XRD)결과표명소제비적미구정형위금홍석,소묘전경(SEM)결과현시미구적직경대약위700 nm,유립경약위16 nm적소과립퇴적이성.통과괄도법제비료재TiO2소과립층상도복유작위산사층적TiO2미구화미도복미구적박막.병통과화학욕침적(CBD)적방법재막상생장CdS/CdSe양자점,득도료양자점민화태양능전지(QDSCs).자외흡수화만반사결과표명,저충미구결구유리우양자점적침적,구유교강적광산사작용,유효지증가료광선적수집,종이제고료전지적광전류,최종득도료4.5%적광전전환효솔,비불가산사층적전지적효솔고27.7%,야비이용전통산사층(유20 nm TiO2소과립화400 nm TiO2고체과립조성)적전지효솔고10.2%.아문파전지효솔적제승귀인우교강적광산사작용화교장적전자수명.
Mesoporous TiO2 microspheres (MSs) were successful y synthesized by the direct hydrolysis of TiCl4 in ethanol aqueous solution using cetyltrimethyl ammonium bromide (CTAB) as a template. X-ray diffraction (XRD) revealed a rutile structure for TiO2 in al the products. Scanning electron microscopy (SEM) revealed that the TiO2 microspheres had an average diameter of 700 nm, and they were composed of packed nanoparticles that had a mean size of about 16 nm. Films with or without TiO2 microspheres, as a scattering layer on top of the TiO2 nanocrystal ine layer, were prepared by the doctor-blade method. CdS/CdSe quantum dots (QDs) were grown on films by chemical bath deposition (CBD) to form QD sensitized solar cells (QDSCs). Ultraviolet-visible and diffuse reflectance spectra showed that these micro-spherical structures were favorable for the deposition of QDs and a relatively higher light scattering effect was observed. This effectively enhanced light harvesting and led to an increase in the photocurrent of the QDSCs. As a result, a power conversion efficiency of 4.5%was obtained, which is 27.7%higher than that of QDSCs without scattering layers and 10.2%higher than that of QDSCs with traditional scattering layers composed of 20 and 400 nm TiO2 solid particles. We attribute this improvement to their higher light scattering effect and longer electron lifetimes.