Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University , Xiamen 361005, China.
State Key Lab for Physical Chemistry of Solid Surfaces, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen 361005, China.
ACS Appl Mater Interfaces. 2016 Aug 24;8(33):21358-65. doi: 10.1021/acsami.6b05971. Epub 2016 Aug 9.
Perovskite solar cells (PSCs) with TiO2 materials have attracted much attention due to their high photovoltaic performance. Aligned TiO2 nanorods have long been used for potential application in highly efficient perovskite solar cells, but the previously reported efficiencies of perovskite solar cells based on TiO2 nanorod arrays were underrated. Here we show a solvothermal method based on a modified ketone-HCl system with the addition of organic acids suitable for modulation of the TiO2 nanorod array films to fabricate highly efficient perovskite solar cells. Photovoltaic measurements indicated that efficient nanorod-structured perovskite solar cells can be achieved with the length of the nanorods as long as approximately 200 nm. A record efficiency of 18.22% under the reverse scan direction has been optimized by avoiding direct contact between the TiO2 nanorods and the hole transport materials, eliminating the organic residues on the nanorod surfaces using UV-ozone treatment and tuning the nanorod array morphologies through addition of different organic acids in the solvothermal process.
基于 TiO2 材料的钙钛矿太阳能电池（PSCs）因其高光电性能而备受关注。定向 TiO2 纳米棒长期以来一直被用于高效钙钛矿太阳能电池的潜在应用，但以前报道的基于 TiO2 纳米棒阵列的钙钛矿太阳能电池的效率被低估了。在这里，我们展示了一种基于改进的酮-HCl 体系的溶剂热方法，该方法中添加了适合调节 TiO2 纳米棒阵列薄膜的有机酸，以制备高效的钙钛矿太阳能电池。光伏测量表明，通过使用长度约为 200nm 的纳米棒，可以实现高效的纳米棒结构钙钛矿太阳能电池。通过避免 TiO2 纳米棒与空穴传输材料直接接触、使用 UV-臭氧处理消除纳米棒表面的有机残留物以及通过在溶剂热过程中添加不同的有机酸来调整纳米棒阵列形态，优化了在反向扫描方向下 18.22%的记录效率。
