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Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera

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Non-Halogenated Solvent Processed Shortwave Infrared Organic Photodetectors Using Sub-1 eV Bandgap Acceptor with

Hoang Mai Luong^1,2,3,4, Jong-Woon Ha⁵, Hiba Wakidi¹

¹Center for Polymers and Organic Solids, University of California, Santa Barbara, CA, 93106, USA.

Advanced Materials (Deerfield Beach, Fla.)

|November 17, 2025

Summary

High-performance shortwave infrared (SWIR) organic photodetectors (OPDs) were developed using a novel non-fullerene acceptor (6CN) and eco-friendly processing. These devices show excellent responsivity and detectivity for SWIR sensing applications.

Keywords:

activation energy organic photodetectors shortwave infrared

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Area of Science:

Materials Science
Organic Electronics
Photodetector Technology

Background:

Shortwave infrared (SWIR) organic photodetectors (OPDs) show promise but suffer from low responsivity and high noise.
Existing devices often rely on environmentally harmful processing solvents.

Purpose of the Study:

To develop high-performance, eco-friendly SWIR OPDs.
To introduce a novel non-fullerene acceptor (NFA) for enhanced SWIR absorption and photodetection.

Main Methods:

Designed and synthesized a new NFA, 6CN, with an ultra-narrow bandgap (≈0.98 eV) for SWIR absorption up to 1250 nm.
Fabricated bulk-heterojunction (BHJ) OPDs using 6CN blended with PTB7-Th polymer donor.
Employed the environmentally friendly solvent o-xylene for device processing, avoiding halogenated additives.

Main Results:

The 6CN-based BHJ exhibited efficient SWIR absorption, strong charge transfer, and robust charge transport.
Devices processed with o-xylene demonstrated superior photoresponse compared to those from chlorinated solvents.
Achieved high responsivity (≈0.2 A W^-1 at 1200 nm) and specific detectivity (>3 × 10¹¹ Jones) across 300-1200 nm.

Conclusions:

The novel 6CN NFA enables high-performance SWIR photodetection.
Eco-friendly o-xylene processing yields superior OPDs, advancing sustainable flexible SWIR sensing technologies.