Exploiting Plasmon-Induced Hot Electrons in Molecular Electronic Devices
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- 作者：David Conklin ; Sanjini Nanayakkara ; Tae-Hong Park ; Marie F. Lagadec ; Joshua T. Stecher ; Xi Chen ; Michael J. Therien ; Dawn A. Bonnell
- 刊名：ACS Nano
- 出版年：2013
- 出版时间：May 28, 2013
- 年：2013
- 卷：7
- 期：5
- 页码：4479-4486
- 全文大小：560K
- 年卷期：v.7,no.5(May 28, 2013)
- ISSN：1936-086X
文摘
Plasmonic nanostructures can induce a number of interesting responses in devices. Here we show that hot electrons can be extracted from plasmonic particles and directed into a molecular electronic device, which represents a new mechanism of transfer from light to electronic transport. To isolate this phenomenon from alternative and sometimes simultaneous mechanisms of plasmon鈥揺xciton interactions, we designed a family of hybrid nanostructure devices consisting of Au nanoparticles and optoelectronically functional porphyin molecules that enable precise control of electronic and optical properties. Temperature- and wavelength-dependent transport measurements are analyzed in the context of optical absorption spectra of the molecules, the Au particle arrays, and the devices. Enhanced photocurrent associated with exciton generation in the molecule is distinguished from enhancements due to plasmon interactions. Mechanisms of plasmon-induced current are examined, and it is found that hot electron generation can be distinguished from other possibilities.