4.8 Article

Polymethyl Methacrylate as an Interlayer Between the Halide Perovskite and Copper Phthalocyanine Layers for Stable and Efficient Perovskite Solar Cells

Journal

ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 13, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202110473

Keywords

copper phthalocyanine; perovskite solar cells; poly(methyl methacrylate)

Funding

  1. Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning (MSIP) [NRF-2018R1A3B1052820]
  2. industry-academic cooperative project of Hyundai Motor Company, Republic of Kore
  3. National Research Foundation of Korea [2018R1A3B1052820] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The study focused on the use of inexpensive, efficient, and stable hole-transporting layers (HTLs) for commercialization of perovskite solar cells. By combining CuPc with PMMA interlayer, the PSC showed enhanced efficiency and stability, with PMMA reducing surface defects and electronic barriers. The PSC achieved a PCE of 21.3% and over 80% stability after 760 hours under harsh conditions.
The use of inexpensive, highly efficient, and long-term stable hole-transporting layers (HTLs) while facilitating the fabrication process has become a critical issue for PSC commercialization. Among organic HTLs, copper phthalocyanine (CuPc) has been increasingly studied owing to its low cost and excellent thermal stability. Nevertheless, CuPc has a low energy level in the conduction band, resulting in low efficiency due to a poor electron barrier. In this study, an efficient and stable PSC is fabricated by combining CuPc with an ultrathin poly(methyl methacrylate) (PMMA) interlayer, which is deposited on a [(FAPbI(3))(0.95)(MAPbBr(3))(0.05)] absorption layer (here, FAPbI(3) and MAPbBr(3) denote formamidinium lead triiodide and methylammonium lead tribromide, respectively). PMMA in perovskite has been found to reduce perovskite surface defects and series resistance as well as the electronic barrier to HTL. The optimum concentration of PMMA allows for the fabrication of the PSC with a PCE of 21.3%, which is the highest PCE for PSCs featuring metal phthalocyanines as the HTL reported to date. The stability of the encapsulated PSC exceeds 80% after 760 h at 85 degrees C under 85% RH conditions.

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