University of Sussex
Browse
EDL_Varactor_clean revised manuscript.pdf (14.01 MB)

Geometry-based tunability enhancement of flexible thin-film varactors

Download (14.01 MB)
journal contribution
posted on 2023-06-09, 07:31 authored by S Knobelspies, C Gonnelli, C Vogt, A Daus, Niko Munzenrieder, G Tröster
In this letter, flexible voltage-controlled capacitors (varactors) based on an amorphous Indium–Gallium–Zinc–Oxide (a-IGZO) semiconductor are presented. Two different varactor designs and their influence on the capacitance tuning characteristics are investigated. The first design consists of a top electrode finger structure which yields a maximum capacitance tunability of 6.9 at 10 kHz. Second, a novel interdigitated varactor structure results in a maximum tunability of 93.7 at 100 kHz. The design- and frequency-dependencies of the devices are evaluated through C–V measurements. Furthermore, we show bending stability of the devices down to a tensile radius of 6 mm without altering the performance. Finally, a varactor is combined with a thin-film resistor to demonstrate a tunable RC-circuit for impedance matching and low-pass filtering applications. The device fabrication flow and material stack are compatible with standard flexible thin-film transistor fabrication which enables parallel implementation of analog or logic circuitry and varactor devices.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

IEEE Electron Device Letters

ISSN

0741-3106

Publisher

IEEE

Issue

8

Volume

38

Page range

1117-1120

Department affiliated with

  • Engineering and Design Publications

Research groups affiliated with

  • Sensor Technology Research Centre Publications

Notes

© 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2017-08-02

First Open Access (FOA) Date

2017-08-02

First Compliant Deposit (FCD) Date

2017-08-02

Usage metrics

    University of Sussex (Publications)

    Categories

    No categories selected

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC