Resist Thermal Shock Through Viscoelastic Interface Encapsulation in Perovskite Solar Cells

Sai Ma, Jiahong Tang, Guizhou Yuan, Ying Zhang, Yan Wang, Yuetong Wu, Cheng Zhu, Yimiao Wang, Shengfang Wu, Yue Lu, Shumeng Chi, Tinglu Song, Huanping Zhou, Manling Sui, Yujing Li*, Qi Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Enhancing the lifetime of perovskite solar cells (PSCs) is one of the essential challenges for their industrialization. Although the external encapsulation protects the perovskite device from the erosion of moisture and oxygen under various harsh conditions. However, the perovskite devices still undergo static and dynamic thermal stress during thermal and thermal cycling aging, respectively, resulting in irreversible damage to the morphology, component, and phase of stacked materials. Herein, the viscoelastic polymer polyvinyl butyral (PVB) material is designed onto the surface of perovskite films to form flexible interface encapsulation. After PVB interface encapsulation, the surface modulus of perovskite films decreases by nearly 50%, and the interface stress range under the dynamic temperature field (−40 to 85 °C) drops from −42.5 to 64.8 MPa to −14.8 to 5.0 MPa. Besides, PVB forms chemical interactions with FA+ cations and Pb2+, and the macroscopic residual stress is regulated and defects are reduced of the PVB encapsulated perovskite film. As a result, the optimized device's efficiency increases from 22.21% to 23.11%. Additionally, after 1500 h of thermal treatment (85 °C), 1000 h of damp heat test (85 °C & 85% RH), and 250 cycles of thermal cycling test (−40 to 85 °C), the devices maintain 92.6%, 85.8%, and 96.1% of their initial efficiencies, respectively.

Original languageEnglish
JournalEnergy and Environmental Materials
DOIs
Publication statusAccepted/In press - 2024

Keywords

  • device stability
  • perovskite solar cells
  • stress field
  • surface modulus
  • thermal shock

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