Regensburg 2022 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 26: Organic Electronics and Photovoltaics 2

CPP 26.1: Talk

Wednesday, September 7, 2022, 11:30–11:45, H38

Large Area Semitransparent Near-Infrared Organic Photodetectors — Yazhong Wang¹, •Tianyi Zhang¹, Louis Conrad Winkler¹, Donato Spoltore², Johannes Benduhn¹, and Karl Leo¹ — ¹Dresden Integrated Center for Applied Physics and Photonic Materials, Technische Universität Dresden, Dresden, Germany — ²Department of Mathematical, Physical and Computer Sciences, University of Parma, V.le delle Scienze 7/A, 43124 Parma, Italy

Organic photodetector (OPD) is a promising technology for several sensing applications. With advances in material synthesis and device engineering, OPDs can rival their inorganic counterparts due to their tunable absorption, lightweight, facile fabrication, low cost, and comparable performance. Here, we demonstrate a semi-transparent large area (256 mm²) near-infrared OPD. Through vacuum deposition and optimization of the thickness of the back metal contact layer, a promising average visible transmittance up to 34.6% is achieved while maintaining 36.0% of external quantum efficiency at 790 nm. Judicious design for combining wide-optical gap buffer layers with semi-transparent electrodes results in the remarkable specific detectivity of 1.4×10¹³(6.44 mm²) and 1.1×10¹²(large area) Jones, respectively. Those performances are comparable with commercial silicon photodiodes. To the best of our knowledge, our device is the best see-through, large-area, near-infrared OPD, which enables a higher level of photon detection and integration into image sensors. The transparency and good stability of these OPDs make them excellent candidates for various biomedical sensing applications and the internet of things.