A high-resolution thin-film fingerprint sensor using a printed organic photodetector

Daniel Tordera, Bart Peeters, Hylke B. Akkerman, Albert J.J.M. van Breemen, Joris Maas, Santhosh Shanmugam, Auke J. Kronemeijer, Gerwin H. Gelinck (Corresponding author)

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4 Citations (Scopus)

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.

Original languageEnglish
Article number1900651
Number of pages6
JournalAdvanced Materials Technologies
Volume4
Issue number11
Early online date23 Sep 2019
DOIs
Publication statusPublished - 1 Nov 2019

Keywords

  • biometric sensor
  • bulk heterojunction
  • fingerprint sensor
  • organic photodetector
  • organic photodiode

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    Tordera, D., Peeters, B., Akkerman, H. B., van Breemen, A. J. J. M., Maas, J., Shanmugam, S., Kronemeijer, A. J., & Gelinck, G. H. (2019). A high-resolution thin-film fingerprint sensor using a printed organic photodetector. Advanced Materials Technologies, 4(11), [1900651]. https://doi.org/10.1002/admt.201900651