Characterization of photoinduced electron tunneling in gold/SAM/Q-CdSe systems by time-resolved photoelectrochemistry

被引：72

作者：

Bakkers, EPAM

Roest, AL

Marsman, AW

Jenneskens, LW

de Jong-van Steensel, LI

Kelly, JJ

Vanmaekelbergh, D

机构：

[1] Univ Utrecht, Debye Inst, Dept Chem & Phys Condensed Matter, NL-3508 TA Utrecht, Netherlands

[2] Univ Utrecht, Debye Inst, Dept Phys Organ Chem, NL-3508 TA Utrecht, Netherlands

[3] Univ Utrecht, Debye Inst, Dept Interfaces Chem, NL-3508 TA Utrecht, Netherlands

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 31期

关键词：

D O I：

10.1021/jp000286u

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Colloidal CdSe quantum dots were chemisorbed on a gold electrode using a variety of self-assembled monolayers (SAMs) consisting of dithiols and rigid disulfides. After absorption of a photon with an energy larger than the band gap, a long-lived excited state is formed in the quantum dot; this state can decay by electron tunneling via the gold. The rate of photoinduced tunneling was measured directly by intensity-modulated photocurrent spectroscopy (IMPS), and its distance dependence was studied using rigid SAMs separating the Q-CdSe and Au. The tunneling rate was found to depend exponentially on the distance, with a decay length of 2 Angstrom.

引用

页码：7266 / 7272

页数：7

共 59 条

[1] Photoelectrochemical charge transfer properties of electrodeposited CdSe quantum dots [J].