Conformal Integration of an Inkjet‐Printed PbS QDs‐Graphene IR Photodetector on a Polymer Optical Fiber

Author:

Kara Gökhan1ORCID,Bolat Sami2ORCID,Sharma Khushdeep3,Grotevent Matthias J.14ORCID,Dirin Dmitry N.4ORCID,Bachmann Dominik1,Furrer Roman1ORCID,Boesel Luciano F.3ORCID,Romanyuk Yaroslav E.2ORCID,Rossi René M.3ORCID,Kovalenko Maksym V.24ORCID,Calame Michel15ORCID,Shorubalko Ivan1ORCID

Affiliation:

1. Laboratory for Transport at Nanoscale Interfaces Empa – Swiss Federal Laboratories for Materials Science and Technology Dübendorf CH‐8600 Switzerland

2. Laboratory for Thin Films and Photovoltaics Empa – Swiss Federal Laboratories for Materials Science and Technology Dübendorf CH‐8600 Switzerland

3. Laboratory for Biomimetic Membranes and Textiles Empa – Swiss Federal Laboratories for Materials Science and Technology St. Gallen CH‐9014 Switzerland

4. Department of Chemistry and Applied Biosciences ETH – Swiss Federal Institute of Technology Zurich Zurich CH‐8093 Switzerland

5. Department of Physics and Swiss Nanoscience Institute University of Basel Basel CH‐4056 Switzerland

Abstract

AbstractHybrid graphene‐colloidal PbS quantum dots (QDs) phototransistors are promising to overcome the geometrical restrictions of photodetectors to flat substrates. While compatible with conformal manufacturing, the experimental demonstration of their application to curved surfaces remains elusive. This work demonstrates the seamless integration of an infrared (IR) photodetector to a polymer optical fiber (POF) by wrapping graphene around the POF of 1 mm in diameter and, subsequently, inkjet printing of PbS QDs onto the curved surface. The device acts as a functional coating and detects infrared light propagating through the POF without interrupting the waveguide. The formulated α‐terpineol and hexane co‐solvent ink supports drop‐on‐demand placement with a resolution of 50 µm and is colloidally stable over 7 months. A responsivity map over gate voltage and temperature (300 to 80 K) of a device, fabricated on a common flat substrate, reveals a responsivity of R ≈ 1 × 103AW−1 (irradiance ≈1 µW cm−2) and a detectivity of D* ≈ 1 × 1010 Jones at 1.6 µm wavelength. This work brings the integration of this cost‐effective and adaptable hybrid detector approach closer to multifunctional e‐textiles and will, notably, help to improve the interfacing of the skin as desired for wearable and non‐invasive healthcare applications.

Funder

Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

Publisher

Wiley

Subject

Industrial and Manufacturing Engineering,Mechanics of Materials,General Materials Science

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