Abstract
Two-dimensional graphene-based devices which utilize the tunable quantum capacitance property in graphene have been studied for a number of sensing and optical applications [1]-[3]. Radio frequency (RF) variable capacitors (varactors) can be realized in the form of metal-oxide-graphene structures [4] by exploiting the high carrier mobility and the above-stated tunable capacitance property in graphene. High-speed graphene varactors could have potential for use in beam-steering antennas and other communication devices, particularly those requiring glass or flexible substrates where integration of tuning elements would otherwise require flip-chip bonding of bulky tuning elements [5]. While conventional graphene varactors can potentially address the critical need for RF-compatible tunable elements [6], they would still need a power supply during operation. In this work, we report for the first time, graphene varactors integrated with ferroelectric (Hf,Zr)O (HZO). The devices display capacitance tuning ratio of 1.5 within a \pm 2\mathrm{V} gate voltage sweep, with Dirac point (V-{\mathrm{Dirac}}) tunability of 1.7 V within the same sweep window. Furthermore a non-volatile (zero-bias) tuning ratio of 1.2 was achieved, with significant further improvement possible through design optimization. These results could have important significance in a wide range of reconfigurable RF communication applications including wearable antennas, and autonomous vehicles.
Original language | English (US) |
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Title of host publication | 2019 Device Research Conference, DRC 2019 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Pages | 109-110 |
Number of pages | 2 |
ISBN (Electronic) | 9781728121123 |
DOIs | |
State | Published - Jun 2019 |
Externally published | Yes |
Event | 2019 Device Research Conference, DRC 2019 - Ann Arbor, United States Duration: Jun 23 2019 → Jun 26 2019 |
Publication series
Name | Device Research Conference - Conference Digest, DRC |
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Volume | 2019-June |
ISSN (Print) | 1548-3770 |
Conference
Conference | 2019 Device Research Conference, DRC 2019 |
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Country/Territory | United States |
City | Ann Arbor |
Period | 6/23/19 → 6/26/19 |
Bibliographical note
Publisher Copyright:© 2019 IEEE.