Importance of ligands on TiO2 nanocrystals for perovskite solar cells
Zhao Yao, Zhao Yi-Cheng, Zhou Wen-Ke, Fu Rui, Li Qi, Yu Da-Peng, Zhao Qing †
       

Top-view SEM images of TiO2 ETL with different TiAc2 addition (a) , (b) , (c) , (d) , (e) , and (f) perovskite film.