Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.545
Publication date: 16th December 2024
Shortwave infrared (SWIR) has various applications, including night vision, remote sensing, and medical imaging. SWIR organic photodetectors (OPDs) offer advantages such as flexibility, cost-effectiveness, and tunable properties. In this talk, I will discuss the development of OPD materials processed from green solvents and device engineering to extend the wavelength detection range of OPD to a longer wavelength. We demonstrate a proof-of-concept in PTB7-Th:COTIC-4F blend system, achieving external quantum efficiency (EQE) > 50 % over a broad spectrum (450 – 1100 nm) with a peak specific detectivity (D*) of 1.1 x 1013 Jones at 1100 nm, while cut-off bandwidth, speed, and linearity are preserved. By employing a novel small-molecule acceptor IR6, a record high EQE = 35 % and D* = 4.1 x 1012 Jones are obtained at 𝝀 = 1150 nm. Additionally, we develop a high-performance non-halogenated-solvent-processed BHJ OPD utilizing a novel ultranarrow-bandgap NFA to achieve an exceptional EQE of ~20 % at λ = 1200 nm while retaining sub-μA.cm−2 dark current density level and D* > 3 × 1011 Jones over a broad spectrum of 400 – 1200 nm. This work emphasizes the importance of molecular design in optoelectronic devices.
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