https://doi.org/10.1051/epjconf/202226609009
Active tuning of the optical response of field-effect-gated transparent conductive oxides
1 OPTMATLAB Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy
2 CNR-SPIN, Corso F.M. Perrone 24, 16152 Genova, Italy
* Corresponding author: sygletou@fisica.unige.it
Published online: 13 October 2022
Transparent Conductive Oxides (TCOs) are a class of materials with high optical transparency and electrical conductivity. This combination makes them extremely appealing for solar cells, optoelectronics and infrared-plasmonics applications. In this work, we report the active tuning of the optical response of aluminium-doped ZnO (AZO) films upon electrical gating within a parallel-plate capacitor configuration. We investigated the electrical-bias-dependent optical response of thin AZO films fabricated by pulsed laser deposition by means of spectroscopic ellipsometry (SE). Calculations based on an exponentially-decaying spatial distribution of injected/depleted charge density in the AZO film are in accordance with experimental observations, allowing the extraction of the Debye length.
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