Smart integration of organic light-emitting transistors with organic photodiodes for ultracompact plasmonic sensors

Mario Prosa; Emilia Benvenuti; David Kallweit; Paola Pellacani; Michael Toerker; Margherita Bolognesi; Laura Lopez-Sanchez; Franco Marabelli; Stefano Toffanin

doi:10.1117/12.2621469

30 May 2022 Smart integration of organic light-emitting transistors with organic photodiodes for ultracompact plasmonic sensors

Mario Prosa, Emilia Benvenuti, David Kallweit, Paola Pellacani, Michael Toerker, Margherita Bolognesi, Laura Lopez-Sanchez, Franco Marabelli, Stefano Toffanin

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Proceedings Volume PC12149, Organic Electronics and Photonics: Fundamentals and Devices III; PC121490P (2022) https://doi.org/10.1117/12.2621469
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

The integration of multiple devices in a single functional unit is boosting the advent of a series of compact optical sensors for rapid and on-site analysis. In this context, the huge potential of plasmonic-based sensors has been affected by the strict constraints of the detection scheme. The need for laboratory equipment, such as laser sources and expensive prism-based optics, results therefore in not-portable systems. Here, an ultra-compact plasmonic sensor is demonstrated through the smart-integration of an organic light-emitting transistor (OLET), an organic photodiode (OPD), and a nanostructured plasmonic grating (NPG).[1] The direct integration of the OPD onto the planar structure of the OLET provided an unprecedented high degree of proximity of the light-source and light detecting areas, which enabled the exploitation of the angle-dependent sensing characteristics of the NPG. The most effective 3D layout of integration, including the optimal size and relative positioning of the three elements (i.e. OLET, OPD, and NPG), was unravelled by an advanced simulation tool, which also predicted the signal variation of the sensor under different conditions. Accordingly, the effectiveness of the new plasmonic-based detection scheme was demonstrated by the dependence of the OPD photocurrent on the surrounding environment of the NPG. In particular, a variation of the OPD photocurrent of about 10-9 A was recorded when exposing the NPG from water to alcoholic solutions at different concentrations. A miniaturized plasmonic sensor with a total size of 0.1 cm3 was therefore obtained through the smart integration of nanometer-thick optoelectronic and plasmonic components. [1] M. Prosa, et. al. Adv. Funct. Mater. 2021, 2104927. https://doi.org/10.1002/adfm.202104927

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Mario Prosa, Emilia Benvenuti, David Kallweit, Paola Pellacani, Michael Toerker, Margherita Bolognesi, Laura Lopez-Sanchez, Franco Marabelli, and Stefano Toffanin "Smart integration of organic light-emitting transistors with organic photodiodes for ultracompact plasmonic sensors", Proc. SPIE PC12149, Organic Electronics and Photonics: Fundamentals and Devices III, PC121490P (30 May 2022); https://doi.org/10.1117/12.2621469

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KEYWORDS

Organic light emitting transistors

Plasmonic sensors

Photodiodes

Plasmonics

Sensors

Optical sensors

Optoelectronics

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