Improved Stability of Interfacial Energy-Level Alignment in Inverted Planar Perovskite Solar Cells

ACS Applied Materials & Interfaces
Soeun ImJung Hyun Kim

Abstract

Even though poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been commonly used as a hole extraction layer (HEL) for p-i-n perovskite solar cells (PSCs), the cells' photovoltaic performance deteriorates because of the low and unstable work functions (WFs) of PEDOT:PSS versus those of a perovskite layer. To overcome this drawback, we synthesized a copolymer (P(SS- co-TFPMA)) ionomer consisting of PSS and tetrafluoropropylmethacrylate (TFPMA) as an alternative to conventional PEDOT:PSS. The PEDOT:P(SS- co-TFPMA) copolymer solution and its film exhibited excellent homogeneity and high phase stability compared with a physical mixture of TFPMA with PEDOT:PSS solution. During spin coating, a self-organized conducting PEDOT:P(SS- co-TFPMA) HEL evolved and the topmost PEDOT:P(SS- co-TFPMA) film showed a hydrophobic surface with a higher WF compared to that of the pristine PEDOT:PSS film because of its chemically bonded electron-withdrawing fluorinated functional groups. Interestingly, the WF of the conventional PEDOT:PSS film dramatically deteriorated after being coated with a perovskite layer, whereas the PEDOT:P(SS- co-TFPMA) film represented a relatively small influence. Because of the superior energy-level al...Continue Reading

References

Jun 19, 2013·Advanced Materials·Jun-Yuan JengTen-Chin Wen
Aug 2, 2016·Energy & Environmental Science·Michael SalibaMichael Grätzel
Sep 7, 2016·ACS Applied Materials & Interfaces·In Soo KimAlex B F Martinson
Dec 30, 2016·ACS Applied Materials & Interfaces·Shan CongGuifu Zou
Jan 14, 2017·The Journal of Physical Chemistry Letters·Wei ChenZhubing He
Feb 9, 2017·ACS Applied Materials & Interfaces·Jérémy BarbéSilvano Del Gobbo
Jun 8, 2018·Advanced Science·Qingxia FuYiwang Chen

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