Efficient Regular Perovskite Solar Cells Based on Pristine [70]Fullerene as Electron-Selective Contact

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PSCs) are promising renewable energy devices.
• Electron-selective contacts (ESCs) are crucial for PSC performance.
• [70]Fullerene is explored as a potential ESC material.

Purpose of the Study:

• To present [70]fullerene as an efficient ESC for regular-architecture PSCs.
• To introduce a solution processing protocol, the fullerene saturation approach (FSA), for preparing fullerene-based PSCs.
• To demonstrate the effectiveness of FSA in overcoming [70]fullerene's limitations.

Main Methods:

• Development of a simple solution processing protocol (FSA).
• Preparation of PSCs using [70]- and [60]fullerene as ESCs.
• Optimization of [70]fullerene film thickness and solubility control via FSA.

Main Results:

• Achieved similar power conversion efficiencies for [70]- and [60]fullerene devices (10.4% and 11.4%, respectively).
• Demonstrated successful use of [70]fullerene as an ESC despite its low electron mobility and visible-light absorption.
• Showed that FSA prevents [70]fullerene film damage during perovskite deposition.
• Observed significant improvement in perovskite film performance and overall PSC efficiency with FSA.

Conclusions:

• The FSA is a universal and effective protocol for preparing PSCs with various ESCs.
• [70]Fullerene can be efficiently employed as an ESC in PSCs using the FSA.
• This approach enhances PSC performance and widens development opportunities for perovskite solar technology.