Efficient and stable perovskite solar cells thanks to dual functions of oleyl amine-coated PbSO4(PbO)4 quantum dots: Defect passivation and moisture/oxygen blocking

被引:67
作者
Chen, Chong [1 ]
Li, Fumin [1 ]
Zhu, Liangxin [1 ]
Shen, Zhitao [1 ]
Weng, Yujuan [1 ]
Lou, Qiang [1 ]
Tan, Furui [1 ]
Yue, Gentian [1 ]
Huang, Qingsong [2 ]
Wang, Mingtai [3 ]
机构
[1] Henan Univ, Henan Key Lab Photovolta Mat, Kaifeng 475004, Peoples R China
[2] Sichuan Univ, Sch Chem Engn, Chengdu 610065, Peoples R China
[3] Chinese Acad Sci, Inst Appl Technol, Hefei Inst Phys Sci, Hefei 230031, Peoples R China
基金
美国国家科学基金会; 中国国家自然科学基金;
关键词
Perovskite solar cells; PbSO4(PbO)(4) quantum-dots; Passivate; Efficiency; Stability; HALIDE PEROVSKITES; HIGHLY EFFICIENT; GRAIN-BOUNDARIES; CH3NH3PBI3; TEMPERATURE; PERFORMANCE; GROWTH; FILMS; DEGRADATION; STABILITY;
D O I
10.1016/j.nanoen.2019.104313
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
The defects in perovskite crystals and the penetration of moisture/oxygen into the perovskite layer are major problems for perovskite solar cells (PSCs) to achieve long-term stability and high power conversion efficiency (PCE). However, there is still a lack of multifunctional passivation materials to solve these problems. Herein, for the first time, we report oleyl amine-coated PbSO4(PbO)(4) quantum-dots (QDs), as a passivation material with dual functions to simultaneously passivate the surface defects and block the penetration of moisture/oxygen into the perovskite layer for stable and efficient PSCs. The PbSO4(PbO)(4) QDs significantly reduce the defect density of the as-prepared CH3NH3PbI3 films by passivating under-coordinated Pb ions and I anions and effectively enhance charge extraction efficiency at the TiO2/CH3NH3PbI3 and CH3NH3PbI3/spiro-OMeTAD interfaces. Moreover, the hydrogen bond between H atoms of the OA and I atoms of the perovskite and the interface electric field at CH3NH3PbI3/OA interface also contribute to the improvement of efficiency and stability of PSCs. Finally, higher PCE (20.02%) is achieved by the PSCs with OA-coated PbSO4(PbO)(4) QDs compared to that (16.86%) of the PSCs without OA-coated PbSO4(PbO)(4), corresponding to a 18.7% enhancement. Moreover, the PSCs with OA-coated PbSO4(PbO)(4) QDs maintain 90% of initial efficiency after operation for 280 h, indicating better stability than the PSCs without PbSO4(PbO)(4) QDs.
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页数:11
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