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Updated: Aug 1, 2025

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Highest-Efficiency Flexible Perovskite Solar Module by Interface Engineering for Efficient Charge-Transfer.

Dong Yang1,2, Ruixia Yang1, Cong Zhang3

  • 1Dalian National Laboratory for Clean Energy, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China.

Advanced Materials (Deerfield Beach, Fla.)
|April 30, 2023
PubMed
Summary
This summary is machine-generated.

A novel tin oxide (SnO2:OH) electron-transport layer boosts flexible perovskite solar cell performance. This material enhances efficiency and stability, achieving a record 18.71% power conversion efficiency for flexible modules.

Keywords:
flexible devicesinterface engineeringmechanical propertiessolar modulesstability

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Electron-transport layers (ETLs) are crucial for efficient flexible perovskite solar cells (F-PSCs).
  • Optimizing ETL properties like defect density and surface wettability is key to enhancing device performance.
  • Existing ETLs often face challenges in achieving optimal energy band alignment and interface compatibility with perovskite layers.

Purpose of the Study:

  • To develop a room-temperature-processed SnO2:OH ETL for F-PSCs.
  • To improve the electron extraction efficiency and overall performance of F-PSCs.
  • To achieve high power conversion efficiency (PCE) and enhanced stability in large-area flexible perovskite solar modules.

Main Methods:

  • Fabrication of a SnO2:OH ETL processed at room temperature.
  • Characterization of the ETL's defect density, oxygen vacancy concentration, energy band alignment, and surface properties.
  • Investigation of interfacial hydrogen bond formation between the ETL and perovskite layer.
  • Fabrication and testing of large-area flexible perovskite solar modules using the developed ETL.

Main Results:

  • The SnO2:OH ETL exhibited reduced defect density and lower oxygen vacancy concentration.
  • Improved energy band alignment and a more wettable surface facilitated better perovskite deposition.
  • Formation of hydrogen bonds at the ETL-perovskite interface enhanced electron transfer and extraction.
  • A record PCE of 18.71% was achieved for a 36.50 cm2 flexible perovskite solar module.
  • The devices demonstrated high durability, retaining over 83% of initial PCE after flexing, and long-term stability attributed to reduced moisture permeation.

Conclusions:

  • The room-temperature-processed SnO2:OH ETL significantly enhances F-PSC performance and stability.
  • The hydrogen bonding at the interface plays a critical role in efficient electron transfer and device longevity.
  • This work presents a promising pathway for developing high-efficiency, durable, and large-area flexible perovskite solar modules.