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

Chong Chen  Fumin Li  Liangxin Zhu  Zhitao Shen  Yujuan Weng  Qiang Lou  Furui Tan  Gentian Yue  Qingsong Huang  Mingtai Wang  
【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 PbSO_4(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 PbSO_4(PbO)_4 QDs significantly reduce the defect density of the as-prepared CH_3NH_3PbI_3 films by passivating under-coordinated Pb ions and I anions and effectively enhance charge extraction efficiency at the TiO_2/CH_3NH_3PbI_3 and CH_3NH_3PbI_3/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 CH_3NH_3PbI_3/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 PbSO_4(PbO)_4 QDs compared to that(16.86%) of the PSCs without OA-coated PbSO_4(PbO)_4,corresponding to a 18.7% enhancement.Moreover,the PSCs with OA-coated PbSO_4(PbO)_4 QDs maintain 90% of initial efficiency after operation for 280 h,indicating better stability than the PSCs without PbSO_4(PbO)_4 QDs.

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