Formation of efficient dye-sensitized solar cells by introducing an interfacial layer of hierarchically ordered macro-mesoporous TiO2 film

Formation of efficient dye-sensitized solar cells by introducing an interfacial layer of hierarchically ordered macro-mesoporous TiO2 film
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通过引入分级有序的大介孔TiO2薄膜界面层形成高效染料敏化太阳能电池

DOI:
10.1007/s11426-011-4288-9
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发表时间:
2011-05
期刊:
Science China Chemistry
影响因子:
--
通讯作者:
Dan Wang
Dan Wang
中科院分区:
其他
文献类型:
--
作者:
Jiang Du;Xiaoyong Lai;Jonathan E. Halpert;Yu Yang;Dan Wang

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采用限制自组装法在掺氟氧化锡(FTO)衬底上制备了分级有序的大孔介孔TiO 2薄膜(Ti-Ma-Me)。所制备的Ti-Ma-Me具有周期性有序结构和较大的比表面积,可作为纳米TiO 2薄膜(P25-TiO 2)与染料敏化太阳能电池(DSSC)FTO电极之间的界面层。Ti-Ma-Me界面层的引入将短路电流密度(Jsc)从7.49 mA/cm 2增加到10.65 mA/cm 2,并且将开路电压(Voc)从0.65 V增加到0.70 V,这是由于其通过允许高粗糙度因子和增强的多次内反射或散射以及减少背反射而改善的光捕获效率。通过阻断电解质和FTO电极之间的直接接触来传递反应。因此,与使用裸P25 TiO 2光阳极的器件相比,光伏转换效率(η)从3.04%提高到5.55%,提高了83%。
Hierarchically ordered macro-mesoporous TiO2 films (Ti-Ma-Me) were fabricated on fluorine-doped tin oxide (FTO) substrates through the confinement self-assembly method. The prepared Ti-Ma-Me possesses periodically ordered structure and a large specific surface area, which was applied as an interfacial layer between the nanocrystalline TiO2 film (P25-TiO2) and FTO electrode in the dye-sensitized solar cell (DSSC). The introduction of a Ti-Ma-Me interfacial layer increased the shortcircuit current density (Jsc) from 7.49 to 10.65 mA/cm2 and the open-circuit voltage (Voc) from 0.65 to 0.70 V as the result of its improved light harvesting efficiency by allowing for the high roughness factor and enhanced multiple internal reflection or scattering as well as reducing the back-transport reaction by blocking direct contact between the electrolyte and FTO electrode. Therefore, the photovoltaic conversion efficiency (η) was improved by 83% from 3.04% to 5.55%, as compared to a device using a bare P25 TiO2 photoanode.
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