| Full text | |
| Author(s): |
Cardozo de Oliveira, E. R.
;
Pfenning, A.
;
Guarin Castro, E. D.
;
Teodoro, M. D.
;
dos Santos, E. C.
;
Lopez-Richard, V.
;
Marques, G. E.
;
Worschech, L.
;
Hartmann, F.
;
Hoefling, S.
Total Authors: 10
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW B; v. 98, n. 7, p. 6-pg., 2018-08-01. |
| Abstract | |
We explore the nature of the electroluminescence (EL) emission of purely n-doped GaAs/AlGaAs resonant tunneling diodes (RTDs) and the EL evolution with voltage. A singular feature of such a device is unveiled when the electrical output current changes from higher to lower values and the EL on-off ratio is enhanced by two orders of magnitude compared to the current on-off ratio. By combining the EL and the current properties, we are able to identify two independent impact ionization channels associated with the coherent resonant tunneling current and the incoherent valley current. We also perform the same investigation with an associated series resistance, which induces a bistable electrical output in the system. By simulating a resistance variation for the current voltage and the EL, we are able to tune the EL on-off ratio by up to six orders of magnitude. We further observe that the EL on and off states can be either direct or inverted compared to the tunneling current of the on and off states. This electroluminescence, combined with the unique RTD properties, such as the negative differential resistance and high-frequency operation, enables the development of high-speed functional optoelectronic devices and optical switches. (AU) | |
| FAPESP's process: | 14/02112-3 - Optical and transport phenomena in nano-devices |
| Grantee: | Victor Lopez Richard |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 13/18719-1 - Electronic carriers dynamics in semiconductor nanostructures |
| Grantee: | Marcio Daldin Teodoro |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 14/19142-2 - Characterization and processing of semiconductor nanostructures and application as devices |
| Grantee: | Gilmar Eugenio Marques |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 16/50080-9 - 1st Paulista-Bavarian Workshop on Nano-Tailored Semiconductor Devices (NTSD) | São Carlos - SP |
| Grantee: | Gilmar Eugenio Marques |
| Support Opportunities: | Organization Grants - Scientific Meeting |
| FAPESP's process: | 14/07375-2 - Multi-user equipment approved in grant 2013/18719-1: time resolved measurement system |
| Grantee: | Marcio Daldin Teodoro |
| Support Opportunities: | Multi-user Equipment Program |