Size-tunable mesoporous spherical TiO2 as a scattering overlayer in high-performance dye-sensitized solar cells
Size-tunable mesoporous spherical TiO2 as a scattering overlayer in high-performance dye-sensitized solar cells
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DOI：
10.1039/c1jm11043h
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发表时间：
2011-06
影响因子：
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通讯作者：
Yoonseok Park;Yong-June Chang;B. Kum;Eui-Hyun Kong;J. Son;Y. Kwon;T. Park;H. Jang
中科院分区：
文献类型：
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作者：
Yoonseok Park;Yong-June Chang;B. Kum;Eui-Hyun Kong;J. Son;Y. Kwon;T. Park;H. Jang
通过“稀混”驱动的四乙氧基钛水解和溶剂热处理相结合的方法，制备了比表面积为∼110m2 g−1的介孔可调球形二氧化钛(MS TiO2)。采用扫描电子显微镜、透射电子显微镜、X射线衍射仪、氮气吸附分析等手段对层状结构的MS-Ti02进行了表征。用直径分别为587、757和1554 nm的三种不同的纳米级二氧化钛作为散射覆盖层，制备了双层染料敏化太阳能电池。由于MS二氧化钛颗粒由聚集在一起形成大的二次球体的∼10 nm纳米微晶组成，它们可以作为光散射体发挥作用，而不会牺牲染料吸收的表面积。结果，目前的基于二氧化钛的电池在总体效率上有了显著的提高：最大效率为9.37%，而由二氧化钛纳米晶薄膜制成的参比电池的最大效率为6.80%。这一非凡的结果归因于增强的染料载量和光散射的双重效应。
Size-tunable mesoporous spherical TiO2 (MS TiO2) with a surface area of ∼110 m2 g−1 have been prepared through combination of “dilute mixing”-driven hydrolysis of titanium(iv) tetraethoxide and solvothermal treatment. The hierarchically structured MS TiO2 are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and nitrogen sorption analysis. Using three different MS TiO2 (587, 757, and 1554 nm in diameter) as a scattering overlayer on a transparent nanocrystalline TiO2 film, bi-layered dye-sensitized solar cells (DSCs) have been fabricated. Since the MS TiO2 particles are comprised of ∼10 nm nanocrystallites that cluster together to form large secondary spheres, they can function as light scatterers without sacrificing the surface area for dye-uptake. As a result, the present MS TiO2-based cells perform a noticeable improvement in the overall efficiency: maximum 9.37% versus 6.80% for the reference cell made of a TiO2 nanocrystalline film. This extraordinary result is attributed to the dual effects of enhanced dye loading and light scattering.