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Issue 37, 2013
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Tuning zinc oxide/organic energy level alignment using mixed triethoxysilane monolayers

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Abstract

Interfacial energy level alignment influences several critical organic optoelectronic device characteristics including charge transfer barriers, turn-on voltage, and open circuit voltage (Voc). Introduction of dipolar molecular monolayers on metal oxide surfaces has allowed improvements in device performance as well as fundamental studies of energy level alignment in these devices. We demonstrate that dipolar mixed monolayers can be covalently bonded to zinc oxide (ZnO) through the triethoxysilane chemical attachment scheme, and that these monolayers tune the work function of the ZnO surface over 0.6 eV. We then employ mixed monolayer-treated ZnO surfaces as the electron-selective contact in inverted bulk heterojunction photovoltaic devices to determine the correlation between the Voc and the work function of the contact. We find the relationship of −0.14 V eV−1 between the Voc and contact work function is consistent with current results and theories of contact influence on Voc.

Graphical abstract: Tuning zinc oxide/organic energy level alignment using mixed triethoxysilane monolayers

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Submitted
10 May 2013
Accepted
26 Jul 2013
First published
31 Jul 2013

J. Mater. Chem. C, 2013,1, 5935-5943
Article type
Paper

Tuning zinc oxide/organic energy level alignment using mixed triethoxysilane monolayers

T. M. Brenner, G. Chen, E. P. Meinig, D. J. Baker, D. C. Olson, R. T. Collins and T. E. Furtak, J. Mater. Chem. C, 2013, 1, 5935
DOI: 10.1039/C3TC30881B

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