Metalized Porphyrin-Based COFs for Conductive Porous Layers in Perovskite Solar Cells to Enhance Electron Injection,...

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Perovskite solar cells (PSCs) require efficient intermediate layers for improved carrier extraction.
• Traditional methods face challenges with the seesaw effect, hindering optimal electron transport and defect passivation.

Purpose of the Study:

• To develop a novel conductive porous layer (CPL) for PSCs.
• To enhance electron transport, defect passivation, and overall device performance using a Cu2+-loaded metalized porphyrin-based covalent organic framework (Cu-Por-COF).

Main Methods:

• Synthesized and characterized Cu-Por-COF as a CPL at the perovskite bottom interface.
• Fabricated n-i-p type PSCs incorporating the Cu-Por-COF layer.
• Evaluated device performance, including power conversion efficiency (PCE) and long-term stability.

Main Results:

• A Cu-Por-COF coverage of 19% significantly improved electron transport and suppressed electron diffusion.
• Enhanced perovskite film quality, electron injection, and defect passivation were observed.
• Achieved PCEs of 25.41% (0.09 cm2) and 21.99% (1.01 cm2).
• Unencapsulated devices retained over 81% efficiency after 2000 hours, demonstrating remarkable stability.
• Cu-Por-COF effectively chelated lead ions, improving environmental sustainability.

Conclusions:

• Cu-Por-COF serves as an effective CPL for high-performance and stable PSCs.
• The material offers a promising strategy for advancing perovskite solar technology.
• The approach contributes to more sustainable and efficient solar energy conversion.