Yan’an University Achieves 18.35% Efficiency in Carbon-Based Perovskite Solar Cells, Fluorinated Polymer Interface Boosts Stability

Perovskite-Info China

Overview

Researchers at Yan’an University have achieved a 18.35% power conversion efficiency in carbon-based perovskite solar cells (C-PSCs) by implementing a novel interface engineering strategy using fluorinated graphite polymers (GFPs). This GFP layer effectively passivates defects and modulates energy levels in the perovskite film, significantly improving charge extraction and environmental stability. This breakthrough is expected to contribute substantially to the commercialization of low-cost, highly stable C-PSCs.

In Depth

Yan’an University Elevates Carbon-Based Perovskite Solar Cell Efficiency to 18.35% and Enhances Stability with Fluorinated Polymer Interface Technology

Researchers at Yan’an University in China have unveiled a new interface engineering strategy that dramatically improves the performance of carbon-based perovskite solar cells (C-PSCs). By incorporating fluorinated graphite polymers (GFPs), they successfully boosted the power conversion efficiency (PCE) of C-PSCs to 18.35%. This represents a significant advancement, paving the way for the commercialization of C-PSCs.

Technical and Clinical Details

• Multifunctionality of GFPs: The introduced GFPs act as a functional layer on the methylammonium lead iodide (MAPbI3) perovskite thin film. This GFP layer enhances device performance through several mechanisms:
  • Defect Passivation: It effectively passivates trap states at the perovskite crystal surface and grain boundaries, thereby suppressing non-radiative recombination.
  • Energy Level Modulation: The GFPs optimize the band alignment of the device, enhancing the efficiency of charge carrier extraction.
  • Crystallization Control: They promote secondary grain growth within the perovskite film, leading to improved film quality and uniformity.
• Formation of Hydrophobic Barrier: The GFP layer also forms a hydrophobic dipole layer on the perovskite film. This significantly boosts the device’s resistance to external environmental factors such as moisture and oxygen, thereby enhancing long-term stability.
• Performance Enhancement: These improvements collectively lead to enhanced charge extraction efficiency and reduced non-radiative recombination losses, ultimately achieving a high efficiency of 18.35% and excellent environmental stability.

Background and Industry Context

Conventional hole-transport layer (HTL)-free carbon-based perovskite solar cells, which eliminate the need for precious metal electrodes and can be manufactured at low cost, hold great promise as a future low-cost photovoltaic technology. However, their performance, especially long-term stability, has been a major challenge for commercialization. This research demonstrates the potential to overcome these challenges through a simple surface modification, expanding the applicability of C-PSCs.

Future Outlook

Yan’an University’s research unequivocally demonstrates that interface engineering using fluorinated polymers is a powerful strategy for simultaneously enhancing both the efficiency and stability of C-PSCs. This technology offers a new pathway to realize high-performance, reliable perovskite solar cells while keeping manufacturing costs low. In the future, the integration of this approach into large-scale production processes is expected to significantly increase the adoption of C-PSCs in broader markets.