Hybrid structures consisting of an n-Si substrate covered with a cationic polyethylenimine layer and an anionic dye layer were fabricated. Their electrical properties were characterized using tunnel current measurements by a tungsten probe. The obtained I-V curves were analyzed using a modified diode equation. We found out that adsorption of the cationic polyelectrolyte decreases the barrier height of n-Si/organic monolayer/W structure, while adsorption of the low molecular weight anionic dye increases it. The results demonstrate that along with thermionic mechanism other ones are present which prevail at low voltage. In particular, electron tunneling dominates for a single monolayer on the silicon substrate, while, apparently, the Pool-Frenkel mechanism is typical for two monolayers.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 26 Feb 2016|
|Event||17th Russian Youth Conference on Physics of Semiconductors and Nanostructures, Opto- and Nanoelectronics, RYCPS 2015 - St. Petersburg, Russian Federation|
Duration: 23 Nov 2015 → 27 Nov 2015