Organic and solution-processed tandem solar cells with 17.3% efficiency

Area of Science:

• Materials Science
• Renewable Energy
• Organic Electronics

Background:

• Organic photovoltaic (OPV) cells offer advantages but suffer from lower performance compared to other solar technologies.
• Low charge mobility in organic materials limits active-layer thickness and light absorption, hindering efficiency.
• Addressing these limitations is crucial for advancing OPV technology.

Purpose of the Study:

• To overcome the performance limitations of organic photovoltaic cells.
• To achieve a record power conversion efficiency for a monolithic, solution-processed tandem OPV device.

Main Methods:

• Utilized a tandem cell strategy to enhance light absorption and charge extraction.
• Employed semi-empirical model analysis to guide device design.
• Leveraged the tunable band structure of organic materials for optimization.

Main Results:

• Achieved a record and certified 17.29% power conversion efficiency for a two-terminal monolithic tandem OPV.
• Demonstrated a viable strategy to overcome low charge mobility issues in organic photovoltaics.

Conclusions:

• The tandem cell strategy, combined with material design, significantly boosts OPV performance.
• This work sets a new benchmark for solution-processed tandem OPV devices.
• Highlights the potential of organic materials for efficient solar energy conversion.