Li Zhao-Qian, Que Ya-Ping, Mo Li-E, Chen Wang-Chao, Ding Yong, Ma Yan-Mei, Jiang Ling, Hu Lin-Hua, Dai Song-Yuan
†Key Laboratory of Novel Thin-Film Solar Cells, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China.
‡Beijing Key Laboratory of Novel Thin-Film Solar Cells, North China Electric Power University, Beijing 102206, PR China.
ACS Appl Mater Interfaces. 2015 May 27;7(20):10928-34. doi: 10.1021/acsami.5b02195. Epub 2015 May 13.
TiO2 microspheres are of great interest for a great deal of applications, especially in the solar cell field. Because of their unique microstructure and light-scattering effect, TiO2 microsphere-based solar cells often exhibit superior photovoltaic performance. Hence, exploring new suitable TiO2 microspheres for high-efficiency solar cells is essential. In this work, we demonstrate a facile one-pot solvothermal approach for synthesis of TiO2 microspheres using acetone as solvent. The as-prepared TiO2 microspheres are composed of densely interconnected nanocrystals and possess a high specific surface area up to 138.47 m(2) g(-1). As the photoanode, the TiO2 microsphere-based DSSC gives higher dye loading and light adsorption ability as well as longer electron lifetime, resulting in higher short-circuit current value and superior power conversion efficiency (PCE) compared with Dyesol 18 nm TiO2 nanoparticle paste. Finally, the TiO2 microsphere-based DSSC were optimized by adding a TiO2 nanocrystal underlayer and TiCl4 post-treatment, giving a high PCE of 10.32%.
二氧化钛微球在众多应用中极具吸引力，尤其是在太阳能电池领域。由于其独特的微观结构和光散射效应，基于二氧化钛微球的太阳能电池通常表现出优异的光伏性能。因此，探索适用于高效太阳能电池的新型二氧化钛微球至关重要。在这项工作中，我们展示了一种简便的一锅法溶剂热方法，以丙酮为溶剂合成二氧化钛微球。所制备的二氧化钛微球由紧密相连的纳米晶体组成，具有高达138.47 m² g⁻¹ 的高比表面积。作为光阳极，基于二氧化钛微球的染料敏化太阳能电池具有更高的染料负载量和光吸附能力以及更长的电子寿命，与Dyesol 18纳米二氧化钛纳米颗粒浆料相比，具有更高的短路电流值和优异的功率转换效率（PCE）。最后，通过添加二氧化钛纳米晶体底层和TiCl₄ 后处理对基于二氧化钛微球的染料敏化太阳能电池进行优化，获得了10.32%的高功率转换效率。
