Gabriel G. Maia

4 Questions 2 Answers 0 Followers

Questions related from Gabriel G. Maia

Architecture of ohmic contacts for a top-gated hall bar. Can comb-shaped contact under the top-gate improve contact resistance?

Greetings. I am trying to get lower contact resistance in a Hall bar made of a Ge quantum well sandwiched between two SiGe layers. The ohmic metal is Al. After addressing issues like the removal...

15 July 2021 7,206 4 View

What is the thickness profile of the deposition of overlapping layers of thin films?

Greetings. When I deposit a thin film layer, say a block of metal on top of a mesa structure, and then deposit another layer which covers the original one only partially and extends to the mesa,...

07 October 2020 6,800 3 View

Does gold diffusion in Si during annealing change the resistivity of the gold electrode?

Greetings. I have struggled with Al ohmic contacts between a Ge Hall bar and Au electrodes. I thought the problem was the Ge/Al interface (increased resistance due to native oxide formation on...

26 June 2020 5,791 2 View

How can I obtain good Aluminium/Germanium ohmic contacts at low temperatures?

Greetings. I am having trouble achieving ohmic contacts between Aluminium and Germanium that work at low temperatures. My contacts behave ohmically at room temperature, with a relatively high...

10 January 2020 714 4 View