Title
A High-Resolution Thin-Film Fingerprint Sensor Using a Printed Organic Photodetector
Author
Tordera, D.
Peeters, B.
Akkerman, H.B.
van Breemen, A.J.J.M.
Maas, J.
Shanmugam, S.
Kronemeijer, A.J.
Gelinck, G.H.
Publication year
2019
Abstract
Organic photodetectors (OPDs) have attracted much attention in recent years, due to their promise in large-area light sensing applications. Here, high-resolution slot-die-coated large-area bulk heterojunction organic photodiode (OPD) arrays are reported. The OPD uses a novel electron transport layer, indium gallium zinc oxide in combination with a molybdenum oxide top-electrode. Together, these effectively reduce dark current densities to very low levels of ≈10−7 mA cm−2 at −2 V. The OPDs show linear behavior in a wide range of light intensities and high detectivity values under reverse bias conditions. When coated on a 508 ppi TFT backplane, a high-quality optical fingerprint scanner capable of imaging in reflection is realized. The optical and electrical properties of the fingerprint sensor are characterized and high-resolution fingerprint images are obtained.
Subject
Electron transport properties
Gallium compounds
Heterojunctions
II-VI semiconductors
Molybdenum oxide
Photodetectors
Photons
Semiconducting indium compounds
Zinc oxide
Biometric sensors
Bulk heterojunction
Fingerprint sensors
Organic photodetector
Organic photodiodes
Thin film transistors
TFT
To reference this document use:
http://resolver.tudelft.nl/uuid:b8cbbd83-9cee-4fda-95b0-7f5c76027087
DOI
https://doi.org/10.1002/admt.201900651
TNO identifier
869857
Publisher
Wiley-Blackwell
ISSN
2365-709X
Source
Advanced Materials Technologies
Article number
1900651
Document type
article