Reduction of Oxygen Vacancy Related Traps in TiO2 and the Impacts on Hybrid Perovskite Solar Cells

被引:68
作者
Ho, Yu-Che [1 ,2 ]
Hoque, Md Nadim Ferdous [1 ,2 ]
Stoneham, Elizabeth [1 ,2 ]
Warzywoda, Juliusz [3 ]
Dallas, Tim [1 ]
Fan, Zhaoyang [1 ,2 ]
机构
[1] Texas Tech Univ, Dept Elect & Comp Engn, Lubbock, TX 79409 USA
[2] Texas Tech Univ, Nano Tech Ctr, Lubbock, TX 79409 USA
[3] Texas Tech Univ, Whitacre Coll Engn, Mat Characterizat Ctr, Lubbock, TX 79409 USA
基金
美国国家科学基金会;
关键词
ELECTRON-TRANSPORT LAYER; EFFICIENCY ENHANCEMENT; BLOCKING LAYER; PERFORMANCE; NANORODS; LUMINESCENCE; HYSTERESIS; STABILITY; FILM;
D O I
10.1021/acs.jpcc.7b08384
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
One major problem in the application of TiO2 and other oxides as an electron transport layer and optical window in perovskite solar cells (PSCs) is the nonstoichiometric defects related to oxygen vacancies. We report the studies of a TiO2 compact layer annealed in ambient air and in an oxygen environment, and the consequences on planar PSC performance. Chemical analysis and optical studies indicate that oxygen vacancy density can be significantly reduced by changing annealing conditions, leading to higher optical transmission of the TiO2 layer and retarded carrier recombination in the PSC. The carrier dynamics studies found that the electron recombination lifetime was significantly increased. With an improved electron transport layer, the power conversion efficiency of PSCs with a TiO2 compact layer annealed in oxygen was increased from 13.58% to 15.85%, due to a largely enhanced current density when compared to the control PSCs with TiO2 annealed in ambient air.
引用
收藏
页码:23939 / 23946
页数:8
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