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A novel TiO2 nanostructure as photoanode for highly efficient CdSe quantum dot-sensitized solar cells

机译：新型TiO 2 纳米结构作为高效CdSe量子点敏化太阳能电池的光阳极

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For sensitized solar cells, photoanodes combining the advantages of TiO2 nanoparticles (high specific surface area) and one-dimensional (1D) nanostructures (fast transport channels) are ideal for obtaining highly efficient sensitized solar cells. In this paper, 1D connected TiO2 nanoparticles (1D CTNPs) were synthesized by a simple one-pot solvothermal reaction and utilized to fabricate CdSe quantum dot-sensitized solar cells (QDSSCs). To evaluate the effects of the 1D CTNPs on the performance of CdSe QDSSCs, another CdSe QDSSC was fabricated based on conventional TiO2 nanoparticles (TNPs), which were synthesized via a similar solvothermal route with a different reaction time. The 1D CTNP-based CdSe QDSSC showed an impressive light-to-electricity conversion efficiency of 5.45% accompanying an open-circuit voltage of 596 mV, a fill factor of 0.52, and a short-circuit current density of 17.48 mA cm?2. This efficiency is much higher than that of the TNP-based cell (4.00%). The significant enhancements in the open-circuit voltage, short-circuit current, and power conversion efficiency of the 1D CTNP-based CdSe QDSSC compared to the TNP-based cell are explained as follows. The 1D CTNP photoanode has large pores and a relatively high specific surface area, facilitating the loading of CdSe QDs and, most importantly, providing an efficient electron transport pathway, which effectively facilitates electron transport and prolongs electron lifetime. The excellent properties of the 1D CTNPs make them an optimal candidate as a photoanode material for highly efficient QDSSCs.
机译：对于敏化太阳能电池，结合了TiO 2 纳米粒子（高比表面积）和一维（1D）纳米结构（快速传输通道）的优点的光阳极非常适合获得高效敏化太阳能电池。本文通过简单的一锅溶剂热反应合成了一维连接的TiO 2 纳米粒子（1D CTNPs），并用于制备CdSe量子点敏化太阳能电池（QDSSC） ）。为了评估一维CTNPs对CdSe QDSSCs性能的影响，基于常规的TiO 2 纳米颗粒（TNPs）制备了另一种CdSe QDSSC，它们被合成为通过类似的溶剂热途径，但反应时间不同。一维基于CTNP的CdSe QDSSC在596 mV的开路电压，0.52的填充系数和17.48 mA cm的短路电流密度下显示出令人印象深刻的5.45％的光电转换效率？2 。该效率远远高于基于TNP的单元（4.00％）。与基于TNP的电池相比，基于1D CTNP的CdSe QDSSC的开路电压，短路电流和功率转换效率的显着提高解释如下。一维CTNP光电阳极具有大孔和相对较高的比表面积，有利于CdSe QD的装载，最重要的是，它提供了有效的电子传输途径，可有效促进电子传输并延长电子寿命。一维CTNP的优异性能使其成为高效QDSSC的光电阳极材料的最佳选择。

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