Responsivity and noise of infrared photodetectors based on quantum wells and dots ...
| Full text | |
| Author(s): |
Alzeidan, Ahmad
;
de Cantalice, Tiago F.
;
Garcia Jr, Ailton J.
;
Deneke, Christoph F.
;
Quivy, Alain A.
;
IEEE
Total Authors: 6
|
| Document type: | Journal article |
| Source: | 2019 34TH SYMPOSIUM ON MICROELECTRONICS TECHNOLOGY AND DEVICES (SBMICRO 2019); v. N/A, p. 4-pg., 2019-01-01. |
| Abstract | |
A submonolayer quantum dot infrared photodetector (SML-QDIP) was grown on a GaAs(001) substrate by molecular beam epitaxy and processed using conventional optical lithography, wet etching and electron-beam metallization. Additionally, a side of the device was polished at 45 degrees in order to allow optical measurements with s- and p- polarized light. The electro-optical properties of the device were investigated both in normal incidence and at 45 degrees in order to study the quantum confinement of the SML-QD along the lateral and vertical directions. The s-to-p photocurrent ratio was found to be between 0.10 and 0.43, showing that, in this new type of quantum dot, the lateral confinement is still weaker than along the vertical direction, but is better than the one of conventional QDs fabricated in the Stranski-Krastanov growth mode. The maximum specific detectivity in normal incidence was 1.3x10(11) cm Hz1/2/W at 30 K and 0.9V. (AU) | |
| FAPESP's process: | 16/14001-7 - Growth and fabrication of semiconductor nanomembrane structures for basic research and potential device applications |
| Grantee: | Christoph Friedrich Deneke |
| Support Opportunities: | Regular Research Grants |