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Green-Solvent-Processed High-Performance Broadband Organic Photodetectors
Jianfei Huang1,2, Hoang Mai Luong1,2, Jaewon Lee3
1Center for Polymers and Organic Solids, University of California, Santa Barbara, University of California, Santa Barbara, California 93106, United States.
ACS Applied Materials & Interfaces
|July 28, 2023
Summary
Environmentally friendly ortho-xylene enables high-performance solution-processed organic photodetectors. These green-solvent devices achieve high external quantum efficiency and detectivity, offering a sustainable alternative to toxic solvents.
Area of Science:
- Materials Science
- Organic Electronics
- Photodetector Technology
Background:
- Organic photodetectors (OPDs) are crucial for various applications.
- Traditional processing often relies on toxic chlorinated solvents.
- Developing green-solvent processing methods is essential for sustainable electronics.
Purpose of the Study:
- To demonstrate solution-processed organic photodetectors using an environmentally benign solvent.
- To evaluate the performance of these green-solvent-processed devices.
- To compare their performance against devices processed with conventional chlorinated solvents.
Main Methods:
- Utilized ortho-xylene (o-xylene) as a processing solvent for organic photodetectors.
- Employed a wide band gap polymer donor (PBDB-T) and a narrow band gap small-molecule non-fullerene acceptor (CO1-4F).
- Controlled the dissolution of active layer materials in o-xylene at specific temperatures.
Main Results:
- Achieved broadband activity in the organic photodetectors.
- Obtained external quantum efficiency (EQE) up to 70%, outperforming chlorobenzene-processed devices.
- Demonstrated high specific detectivity (>10^12 Jones) with suppressed dark current.
- Showcased applicability for photoplethysmography due to fast response.
Conclusions:
- Ortho-xylene is a viable green solvent for high-performance organic photodetector fabrication.
- Green-solvent processing offers a sustainable route without compromising device performance.
- These findings pave the way for eco-friendly, high-performing organic electronic devices.
