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Published January 1, 2023 | Version v1
Journal article Open

Drastic influence of substituent position on orientation of 2D layers enables efficient and stable 3D/2D perovskite solar cells

Creators

  • 1. Ecole Polytech Fed Lausanne EPFL, Inst Chem Sci & Engn, CH-1015 Lausanne, Switzerland
  • 2. Lomonosov Moscow State Univ, Dept Chem, Moscow 119991, Russia
  • 3. Middle East Tech Univ METU, ODTU GUNAM, TR-06800 Ankara, Turkiye
  • 4. Univ Tokyo, Grad Sch Arts & Sci, Dept Gen Syst Studies, 3-8-1 Komaba,Meguro Ku, Tokyo 1538902, Japan

Description

The lack of long-term stability and reproducibility of perovskite solar cells (PSCs) is the main roadblock preventing their successful commercialization. 3D/2D PSCs are one of the most prominent ways to address these issues. Various salts that are mostly based on phenyl ethyl ammonium iodide (PEAI) have been utilized to grow a 2D perovskite layer on 3D perovskites. Herein, we report the effect of substituting the methoxy (-OMe) group at the ortho (o), meta (m), and para (p) positions on PEAI salts. Photoluminescence and time-resolved photoluminescence show that o-OMe-PEAI-treated surfaces achieve reduced defect densities and nonradiative recombination rates compared with the other analogs. Devices with PCEs over 23% are achieved for o-OMe-PEAI-based 3D/2D PSCs, and the enhanced performance is attributed to the favorable formation energy and desired vertical orientation according to the density functional theory (DFT) analyses. Finally, the unique orientation of the o-OMe-PEAI-based 2D perovskite results in significantly enhanced long-term, moisture, and thermal stability.

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