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Title: Large Spatially Resolved Rectification in a Donor–Acceptor Molecular Heterojunction

Here, we demonstrate that rectification ratios (RR) of ≳250 (≳1000) at biases of 0.5 V (1.2 V) are achievable at the two-molecule limit for donor–acceptor bilayers of pentacene on C 60 on Cu using scanning tunneling spectroscopy and microscopy. Using first-principles calculations, we show that the system behaves as a molecular Schottky diode with a tunneling transport mechanism from semiconducting pentacene to Cu- hybridized metallic C 60. Low-bias RRs vary by two orders-of-magnitude at the edge of these molecular heterojunctions due to increased Stark shifts and confinement effects.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3]
  1. Univ. of Central Lancashire, Preston (United Kingdom)
  2. The Pennsylvania State Univ., University Park, PA (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 16; Journal Issue: 4; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; pentacene; fullerene; rectification; Schottky; STM; STS; DFT
OSTI Identifier:
1399258

Smerdon, Joseph A., Giebink, Noel C., Guisinger, Nathan P., Darancet, Pierre, and Guest, Jeffrey R.. Large Spatially Resolved Rectification in a Donor–Acceptor Molecular Heterojunction. United States: N. p., Web. doi:10.1021/acs.nanolett.6b00171.
Smerdon, Joseph A., Giebink, Noel C., Guisinger, Nathan P., Darancet, Pierre, & Guest, Jeffrey R.. Large Spatially Resolved Rectification in a Donor–Acceptor Molecular Heterojunction. United States. doi:10.1021/acs.nanolett.6b00171.
Smerdon, Joseph A., Giebink, Noel C., Guisinger, Nathan P., Darancet, Pierre, and Guest, Jeffrey R.. 2016. "Large Spatially Resolved Rectification in a Donor–Acceptor Molecular Heterojunction". United States. doi:10.1021/acs.nanolett.6b00171. https://www.osti.gov/servlets/purl/1399258.
@article{osti_1399258,
title = {Large Spatially Resolved Rectification in a Donor–Acceptor Molecular Heterojunction},
author = {Smerdon, Joseph A. and Giebink, Noel C. and Guisinger, Nathan P. and Darancet, Pierre and Guest, Jeffrey R.},
abstractNote = {Here, we demonstrate that rectification ratios (RR) of ≳250 (≳1000) at biases of 0.5 V (1.2 V) are achievable at the two-molecule limit for donor–acceptor bilayers of pentacene on C60 on Cu using scanning tunneling spectroscopy and microscopy. Using first-principles calculations, we show that the system behaves as a molecular Schottky diode with a tunneling transport mechanism from semiconducting pentacene to Cu- hybridized metallic C60. Low-bias RRs vary by two orders-of-magnitude at the edge of these molecular heterojunctions due to increased Stark shifts and confinement effects.},
doi = {10.1021/acs.nanolett.6b00171},
journal = {Nano Letters},
number = 4,
volume = 16,
place = {United States},
year = {2016},
month = {3}
}