Zanoni Kassio P S, Amaral Ronaldo C, Murakami Iha Neyde Y
Laboratory of Photochemistry and Energy Conversion, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo-USP , Av. Prof. Lineu Prestes, 748, 05508-000 São Paulo, SP, Brazil.
ACS Appl Mater Interfaces. 2014 Jul 9;6(13):10421-8. doi: 10.1021/am501955f. Epub 2014 Jun 13.
An innovative all-nano-TiO2 thin film capable of enhancing dye-sensitized solar cell (DSC) photoefficiencies was prepared by a layer-by-layer method beneath the meso-TiO2 film, employing acid and basic nano-TiO2 sols as cations and anions, respectively. TiO2 syntheses were performed under absolute control to lead to appropriate morphological and optical properties to yield high-quality compact films using profilometry, tuning, and scanning electron microscopy. A detailed study by photoelectrochemical parameters, incident photon-to-current efficiency, electron lifetime, and electrochemical impedance spectroscopy demonstrates that the physical contact between FTO and the electrolyte is prevented and the role of the compact film has been elucidated. DSCs with TiO2 bilayers on top of FTO improved the conversion efficiency up to 62%, mainly because of the prevention of FTO/I3(-) charge recombination and an improved contact between FTO and TiO2.
通过逐层法在介观二氧化钛薄膜下方制备了一种能够提高染料敏化太阳能电池（DSC）光电效率的新型全纳米二氧化钛薄膜，分别使用酸性和碱性纳米二氧化钛溶胶作为阳离子和阴离子。二氧化钛的合成在绝对控制下进行，以获得合适的形态和光学性能，从而使用轮廓仪、调谐和扫描电子显微镜制备高质量的致密薄膜。通过光电化学参数、入射光子到电流效率、电子寿命和电化学阻抗谱进行的详细研究表明，防止了FTO与电解质之间的物理接触，并阐明了致密薄膜的作用。在FTO顶部具有二氧化钛双层的DSC将转换效率提高到了62%，这主要是因为防止了FTO/I3(-)电荷复合以及改善了FTO与二氧化钛之间的接触。
