Electron tunneling through alkanedithiol self-assembled monolayers in large-area molecular junctions

被引:165
作者
Akkerman, Hylke B.
Naber, Ronald C. G.
Jongbloed, Bert
van Hal, Paul A.
Blom, Paul W. M.
de Leeuw, Dago M.
de Boer, Bert
机构
[1] Univ Groningen, Zerike inst Adv Mat, NL-9747 AG Groningen, Netherlands
[2] Philips Res Labs, NL-5656 AE Eindhoven, Netherlands
关键词
dielectric constant; molecular electronics; Simmons model;
D O I
10.1073/pnas.0701472104
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The electrical transport through self-assembled monolayers of alkanedithiols was studied in large-area molecular junctions and described by the Simmons model [Simmons JIG (1963) J Appi Phys 34:1793-1803 and 2581-2590] for tunneling through a practical barrier, i.e., a rectangular barrier with the image potential included. The strength of the image potential depends on the value of the dielectric constant. A value of 2.1 was determined from impedance measurements. The large and well defined areas of these molecular junctions allow for a simultaneous study of the capacitance and the tunneling current under operational conditions. Electrical transport for octanedithiol through tetradecanedithiol self-assembled monolayers up to 1 V can simultaneously be described by a single effective mass and a barrier height. There is no need for additional fit constants. The barrier heights are in the order of 4-5 eV and vary systematically with the length of the molecules. Irrespective of the length of the molecules, an effective mass of 0.28 was determined, which is in excellent agreement with theoretical predictions.
引用
收藏
页码:11161 / 11166
页数:6
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