Tailoring vertical phase distribution of quasi-two-dimensional perovskite films via surface modification of hole-transporting layer

Tiefeng Liu, Youyu Jiang, Minchao Qin, Junxue Liu, Lulu Sun, Fei Qin, Lin Hu, Sixing Xiong, Xueshi Jiang, Fangyuan Jiang, Ping Peng, Shengye Jin, Xinhui Lu () and Yinhua Zhou ()
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Tiefeng Liu: Huazhong University of Science and Technology
Youyu Jiang: Huazhong University of Science and Technology
Minchao Qin: The Chinese University of Hong Kong
Junxue Liu: Chinese Academy of Sciences
Lulu Sun: Huazhong University of Science and Technology
Fei Qin: Huazhong University of Science and Technology
Lin Hu: Huazhong University of Science and Technology
Sixing Xiong: Huazhong University of Science and Technology
Xueshi Jiang: Huazhong University of Science and Technology
Fangyuan Jiang: Huazhong University of Science and Technology
Ping Peng: Huazhong University of Science and Technology
Shengye Jin: Chinese Academy of Sciences
Xinhui Lu: The Chinese University of Hong Kong
Yinhua Zhou: Huazhong University of Science and Technology

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Vertical phase distribution plays an important role in the quasi-two-dimensional perovskite solar cells. So far, the driving force and how to tailor the vertical distribution of layer numbers have been not discussed. In this work, we report that the vertical distribution of layer numbers in the quasi-two-dimensional perovskite films deposited on a hole-transporting layer is different from that on glass substrate. The vertical distribution could be explained by the sedimentation equilibrium because of the colloidal feature of the perovskite precursors. Acid addition will change the precursors from colloid to solution that therefore changes the vertical distribution. A self-assembly layer is used to modify the acidic surface property of the hole-transporting layer that induces the appearance of desired vertical distribution for charge transport. The quasi-two-dimensional perovskite cells with the surface modification display a higher open-circuit voltage and a higher efficiency comparing to reference quasi-two-dimensional cells.

Date: 2019
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DOI: 10.1038/s41467-019-08843-5

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