Hg/Molecular Monolayer-Si Junctions: Electrical Interplay between Monolayer Properties and Semiconductor Doping Density
| Autor: | Ayelet Vilan, Marcel Giesbers, Luc Scheres, Izhar Ron, Eric Salomon, Omer Yaffe, Leeor Kronik, Han Zuilhof, David Cahen, Lior Segev, Ariel Biller, Antoine Kahn |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
mis tunnel-diodes
current transport education Nanotechnology Electronic structure crystalline silicon surfaces flat h-si(111) surfaces Condensed Matter::Materials Science metal work function Depletion region voltaic energy-conversion Condensed Matter::Superconductivity Monolayer Work function Physical and Theoretical Chemistry VLAG business.industry Chemistry Organic Chemistry Doping alkyl chain monolayers technology industry and agriculture self-assembled monolayers si(111) surfaces Self-assembled monolayer equipment and supplies Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Organische Chemie Surfaces Coatings and Films Electronic Optical and Magnetic Materials Dipole General Energy Semiconductor Chemical physics business linked organic monolayers |
| Zdroj: | The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces 114 (2010) 22 The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces, 114(22), 10270-10279 |
| ISSN: | 1932-7447 |
| Popis: | Metal-organic molecule-semiconductor junctions are controlled not only by the molecular properties, as in metal-organic molecule-metal junctions, but also by effects of the molecular dipole, the dipolar molecule-semiconductor link, and molecule-semiconductor charge transfer, and by the effects of all these on the semiconductor depletion layer (i.e., on the internal semiconductor barrier to charge transport). Here, we report on and compare the electrical properties (current-voltage, capacitance-voltage, and work function) of large area Hg/organic monolayer-Si junctions with alkyl and alkenyl monolayers on moderately and highly doped n-Si, and combine the experimental data with simulations of charge transport and electronic structure calculations. We show that, for moderately doped Si, the internal semiconductor barrier completely controls transport and the attached molecules influence the transport of such junctions only in that they drive the Si into inversion. The resulting minority carrier-controlled junction is not sensitive to molecular changes in the organic monolayer at reverse and low forward bias and is controlled by series resistance at higher forward bias. However, in the case of highly doped Si, the internal barrier is smaller, and as a result, the charge transport properties of the junction are affected by changing from an alkyl to an alkenyl monolayer. We propose that the double bond near the surface primarily increases the coupling between the organic monolayer and the Si, which increases the current density at a given bias by increasing the contact conductance. |
| Databáze: | OpenAIRE |
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