Simultaneous Enhanced Efficiency and Stability of Perovskite Solar Cells Using Adhesive Fluorinated Polymer Interfacial Material

Mei Lyu, Sungmin Park, Hyeonju Lee, Boo Soo Ma, So Hyun Park, Ki Ha Hong, Hyungjun Kim, Taek Soo Kim, Jun Hong Noh, Hae Jung Son, Nam Gyu Park

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

For enhancing the performance and long-term stability of perovskite solar cell (PSC) devices, interfacial engineering between the perovskite and hole-transporting material (HTM) is important. We developed a fluorinated conjugated polymer PFPT3 and used it as an interfacial layer between the perovskite and HTM layers in normal-type PSCs. Interaction of perovskite and PFPT3 via Pb-F bonding effectively induces an interfacial dipole moment, which resulted in energy-level bending; this was favorable for charge transfer and hole extraction at the interface. The PSC device achieved an increased efficiency of 22.00% with an open-circuit voltage of 1.13 V, short-circuit current density of 24.34 mA/cm2, and fill factor of 0.80 from a reverse scan and showed an averaged power conversion efficiency of 21.59%, which was averaged from forward and reverse scans. Furthermore, the device with PFPT3 showed much improved stability under an 85% RH condition because hydrophobic PFPT3 reduced water permeation into the perovskite layer, and more importantly, the enhanced contact adhesion at the PFPT3-mediated perovskite/HTM interface suppressed surface delamination and retarded water intrusion. The fluorinated conjugated polymeric interfacial material is effective for improving not only the efficiency but also the stability of the PSC devices.

Original languageEnglish
Pages (from-to)35595-35605
Number of pages11
JournalACS Applied Materials and Interfaces
Volume13
Issue number30
DOIs
Publication statusPublished - 2021 Aug 4

Bibliographical note

Funding Information:
This work was supported by the KIST institutional internal program and National R&D Programs through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (MSIT) of Korea under contracts 2020M3H4A1A02084910, 2020M3H4A3081817, NRF-2012M3A6A7054861 (Global Frontier R&D Program on Center for Multiscale Energy System), NRF-2016M3D1A1027663, and NRF-2016M3D1A1027664 (Future Materials Discovery Program). This research was in part supported by the Defense Challengeable Future Technology Program of the Agency for Defense Development of Korea and Energy Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), funded by the Ministry of Trade, Industry and Energy (No. 20193091010310).

Publisher Copyright:
© 2021 American Chemical Society.

Keywords

  • fluorinated conjugated polymer
  • hole-transporting layer
  • interfacial layer
  • moisture stability
  • perovskite solar cell

ASJC Scopus subject areas

  • General Materials Science

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