Solution-Processed Cu9 S5 as a Hole Transport Layer for Efficient and Stable Perovskite Solar Cells

ACS Applied Materials & Interfaces
Dong HanZiqiang Zhao

Abstract

Organic-inorganic perovskite solar cells have seen tremendous developments in recent years. As a hole transport material, 2,2',7,7'-tetrakis( N, N-di- p-methoxyphenylamine)-9,9'-spirobifluorene (Spiro-OMeTAD) is widely used in n-i-p perovskite solar cells. However, it may lead to the perovskite film degradation due to the dopant lithium bis((trifluoromethyl)sulfonyl)amide (Li-TFSI), which has strong hydrophilicity. Cu9S5 is considered as a superior p-type transport material, which also has a favorable energy level matching with the highest occupied molecular orbital of Spiro-OMeTAD. Herein, a solution-processed organic-inorganic-integrated hole transport layer was reported, which is composed of the undoped Spiro-OMeTAD and Cu9S5 layer. Since there is no Li-TFSI doping, it is extremely conductive to the long-term stability of the solar cells. In the meantime, we proposed a method to adjust the lowest unoccupied molecular orbital (LUMO) of SnO2 via nitrogen implantation (N:SnO2). The LUMO of SnO2 can be tuned from -4.33 to -3.91 eV, which matches well with the LUMO of CH3NH3PbI3 (-3.90 eV), and thus helps to reduce hysteresis. The modified hole and electron transport layers were applied in n-i-p perovskite solar cells, which achi...Continue Reading

References

May 29, 2014·Journal of the American Chemical Society·Peng QinMohammad Khaja Nazeeruddin
Aug 12, 2014·Chemical Communications : Chem Comm·Lingling ZhengQihuang Gong
May 1, 2014·The Journal of Physical Chemistry Letters·Henry J SnaithWei Zhang
Oct 14, 2017·ACS Applied Materials & Interfaces·Chuanxiao XiaoMowafak M Al-Jassim

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