Photoinduced Anomalous Coulomb Blockade and the Role of Triplet States in Electron Transport through an Irradiated Molecular Transistor

Bo Fu, Martín A. Mosquera, George C Schatz, Mark A Ratner, Liang Yan Hsu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this study, we explore photoinduced electron transport through a molecule weakly coupled to two electrodes by combining first-principles quantum chemistry calculations with a Pauli master equation approach that accounts for many-electron states. In the incoherent limit, we demonstrate that energy-level alignment of triplet and charged states plays a crucial role, even when the rate of intersystem crossing is much smaller than the rate of fluorescence. Furthermore, the field intensity dependence and an upper bound to the photoinduced electric current can be analytically derived in our model. Under an optical field, the conductance spectra (charge stability diagrams) exhibit unusual Coulomb diamonds, which are associated with molecular excited states, and their widths can be expressed in terms of energies of the molecular electronic states. This study offers new directions for exploring optoelectronic response in nanoelectronics.

Original languageEnglish
Pages (from-to)5015-5023
Number of pages9
JournalNano Letters
Volume18
Issue number8
DOIs
Publication statusPublished - Aug 8 2018

Fingerprint

Coulomb blockade
Electron energy levels
atomic energy levels
Transistors
transistors
Molecular electronics
Quantum chemistry
Diamond
Nanoelectronics
molecular electronics
quantum chemistry
Electronic states
Electric currents
electron states
electric current
Excited states
Optoelectronic devices
Diamonds
electrons
energy levels

Keywords

  • energy conversion
  • Jablonksi diagram
  • Molecular electronics
  • optoelectronics
  • quantum transport

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Photoinduced Anomalous Coulomb Blockade and the Role of Triplet States in Electron Transport through an Irradiated Molecular Transistor. / Fu, Bo; Mosquera, Martín A.; Schatz, George C; Ratner, Mark A; Hsu, Liang Yan.

In: Nano Letters, Vol. 18, No. 8, 08.08.2018, p. 5015-5023.

Research output: Contribution to journalArticle

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