Small-polaron hopping via defect centres: anomalous temperature and voltage dependence of current through fatty-acid monolayers

Autor:	R S Williams, D R Stewart, M. Foygel, V V Osipov
Rok vydání:	2004
Předmět:	Coupling (electronics) Condensed matter physics Chemistry Electrical resistivity and conductivity Monolayer t-J model Electrode General Materials Science Biasing Condensed Matter Physics Polaron Voltage
Zdroj:	Journal of Physics: Condensed Matter. 16:5705-5712
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/16/32/007
Popis:	We study electron hopping in thin metal–insulator–metal structures which involves two defect centres with a strong electron–phonon coupling. We calculate the dependences of the current, J, on voltage, V, and temperature, T, and show that they are consistent with those observed in molecular monolayers of fatty acids. We analyse in detail an unusual, near-exponential temperature dependence of the current: observed at K in eicosanoic acid (C20) organic monolayers sandwiched between Pt electrodes, where the parameter T0 increases with the bias voltage. We show that at relatively high voltages the two-defect small-polaron hopping results in N-shape current–voltage characteristics which were observed in some organic molecular monolayers.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5d2c8a4a85f3b56c0e53b8595f8f418b https://doi.org/10.1088/0953-8984/16/32/007 Zobrazit plný text záznamu