Year: 2018
Type: article
Abstract: We fabricate graphene/p-Si heterojunctions and characterize their current–voltage properties in a wide temperature range. The devices exhibit Schottky diode behaviour with a modest rectification factor up to . The Schottky parameters are estimated in the framework of the thermionic emission theory using Cheung’s and Norde’s methods. At room temperature, we obtain an ideality factor of about 2.5 and a Schottky barrier height of 0.18 eV, which reduces at lower temperatures. We shed light on the physical mechanisms responsible for the low barrier, discussing the p-doping of graphene caused by the transfer process, the exposure to air and the out-diffusion of boron from the Si substrate. We finally propose a band model that fully explains the experimental current–voltage features, included a plateau observed in reverse current at low temperatures.
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Award: G5757193873
OpenAlex ID: W2804977928