Improved Quantum Efficiency of Highly Efficient Perovskite BaSnO3-Based Dye-Sensitized Solar Cells
Improved Quantum Efficiency of Highly Efficient Perovskite BaSnO3-Based Dye-Sensitized Solar Cells
复制标题
DOI：
10.1021/nn305341x
复制
发表时间：
2013-02-01
期刊：
影响因子：
17.1
通讯作者：
Kim, Jin Young
中科院分区：
文献类型：
--
作者：
Shin, Seong Sik;Kim, Ju Seong;Kim, Jin Young
三元氧化物是一种潜在的电子传输材料，可以取代染料敏化太阳能电池（DSSCs）中的TiO2，因为它们的电子/光学性质可以通过操纵组成和/或掺杂很容易地控制。在这里，我们报道了一种新的高效DSSC，使用钙钛矿BaSnO3 （BSO）纳米颗粒。此外，还研究了TiCl4处理对bso基DSSCs的物理、化学和光伏性能的影响。TiCl4处理后在BSO表面形成了一层超薄的TiO2层，其厚度随处理时间的增加而增加。TiO2壳层的形成通过增强电荷输运和抑制电荷复合来提高电荷收集效率。还发现，TiCl4处理显著降低了表面OH的数量，导致染料吸附减少，光收集效率降低。电荷收集和光收集效率之间的权衡效应导致最高的量子效率（即短路光电流密度），导致TiCl4处理3 mm后的最高转换效率为5.5%（相比之下，裸BSO为43%）。通过增加BSO膜的厚度，可以将转换效率进一步提高到6.2%，这是非tio2基DSSCs中效率最高的之一。
Ternary oxides are potential candidates as an electron-transporting material that can replace TiO2 in dye-sensitized solar cells (DSSCs), as their electronic/optical properties can be easily controlled by manipulating the composition and/or by doping. Here, we report a new highly efficient DSSC using perovskite BaSnO3 (BSO) nanoparticles. In addition, the effects of a TiCl4 treatment on the physical, chemical, and photovoltaic properties of the BSO-based DSSCs are investigated. The TiCl4 treatment was found to form an ultrathin TiO2 layer on the BSO surface, the thickness of which increases with the treatment time. The formation of the TiO2 shell layer improved the charge-collection efficiency by enhancing the charge transport and suppressing the charge recombination. It was also found that the TiCl4 treatment significantly reduces the amount of surface OH species, resulting in reduced dye adsorption and reduced light-harvesting efficiency. The trade-off effect between the charge-collection and light-harvesting efficiencies resulted in the highest quantum efficiency (i.e., short-circuit photocurrent density), leading to the highest conversion efficiency of 5.5% after a TiCl4 treatment of 3 mm (cf. 43% for bare BSO). The conversion efficiency could be increased further to 6.2% by increasing the thickness of the BSO film, which is one of the highest efficiencies from non-TiO2-based DSSCs.