Back to Search
Start Over
Optical control of capacitance in a metal-insulator-semiconductor diode with embedded metal nanoparticles.
- Source :
-
Journal of applied physics [J Appl Phys] 2017 Jun 07; Vol. 121 (21), pp. 214504. Date of Electronic Publication: 2017 Jun 06. - Publication Year :
- 2017
-
Abstract
- This paper describes a metal-insulator-semiconductor (MIS) capacitor with flat capacitance voltage characteristics and a small quadratic voltage capacitance coefficient. The device characteristics resemble a metal-insulator-metal diode except that here the capacitance depends on illumination and exhibits a strong frequency dispersion. The device incorporates Fe nanoparticles (NPs), mixed with SrF <subscript>2</subscript> , which are embedded in an insulator stack of SiO <subscript>2</subscript> and HfO <subscript>2</subscript> . Positively charged Fe ions induce dipole type traps with an electronic polarization that is enhanced by photogenerated carriers injected from the substrate and/or by inter nanoparticle exchange of carriers. The obtained characteristics are compared with those of five other MIS structures: two based on Fe NPs, one with and the other without SrF <subscript>2</subscript> sublayers. Additionally, devices contain Co NPs embedded in SrF <subscript>2</subscript> sublayers, and finally, two structures have no NPs, with one based on a stack of SiO <subscript>2</subscript> and HfO <subscript>2</subscript> and the other which also includes SrF <subscript>2</subscript> . Only structures containing Fe NPs, which are incorporated into SrF <subscript>2</subscript> , yield a voltage independent capacitance, the level of which can be changed by illumination. These properties are essential in radio frequency/analog mixed signal applications.
Details
- Language :
- English
- ISSN :
- 0021-8979
- Volume :
- 121
- Issue :
- 21
- Database :
- MEDLINE
- Journal :
- Journal of applied physics
- Publication Type :
- Academic Journal
- Accession number :
- 28652645
- Full Text :
- https://doi.org/10.1063/1.4983760