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Comparison of Molecular Monolayer Interface Treatments in Organic-inorganic Photovoltaic Devices

Published online by Cambridge University Press:  31 January 2011

Jamie M. Albin
Affiliation:
jalbin@mines.edu, Colorado School of Mines, Physics, Golden, Colorado, United States
Darick J. Baker
Affiliation:
darickbaker@gmail.com, Colorado School of Mines, Physics, Golden, Colorado, United States
Cary G. Allen
Affiliation:
callen@mines.edu, Colorado School of Mines, Physics, 80401, Colorado, United States
Thomas E. Furtak
Affiliation:
tfurtak@mines.edu, United States
Reuben T. Collins
Affiliation:
rtcollin@mines.edu, Colorado School of Mines, Physics, Golden, Colorado, United States
Dana C. Olson
Affiliation:
dana_olson@nrel.gov, United States
David S. Ginley
Affiliation:
david_ginley@nrel.gov, United States
Christian C. Weigand
Affiliation:
christian.weigand@iet.ntnu.no, Norwegian University of Science and Technology, Electronics and Telecommunications, Trondheim, Norway
Astrid-Sofie Vardoy
Affiliation:
asvardoy@gmail.com, Norwegian University of Science and Technology, Electronics and Telecommunications, Trondheim, Norway
Cecile Ladam
Affiliation:
Cecile.Ladam@sintef.no, SINTEF, Materials and Chemistry, Trondheim, Norway
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Abstract

In this study, we explore the effects of alkyl surface terminations on ZnO for inverted, planar ZnO/poly(3-hexylthiophene) (P3HT) solar cells using two different attachment chemistries. Octadecylthiol (ODT) and octadecyltriethoxysilane (OTES) molecules were used to create 18-carbon alkyl surface molecular layers on sol gel-derived ZnO surfaces. Molecular layer formation was confirmed and characterized using water contact angle measurements, infrared (IR) transmission measurements, and X-ray photoelectron spectroscopy (XPS). The performances of the ZnO/P3HT photovoltaic cells made from ODT- and OTES-functionalized ZnO were compared. The ODT-modified devices had higher efficiencies than OTES-modified devices, suggesting that differences in the attachment scheme affect the efficiency of charge transfer through the molecular layers at the treated ZnO surface.

Type
Research Article
Copyright
Copyright © Materials Research Society 2009

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Comparison of Molecular Monolayer Interface Treatments in Organic-inorganic Photovoltaic Devices
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