Polyvinylpyrrolidone-modified indium tin oxide as an electroncollecting electrode for inverted polymer solar cells
J. W. Shim,(1) H. Cheun,(1) J. Meyer,(2) C. Fuentes-Hernandez,(1) A. Dindar,(1) Y. Zhou,(1) D. K.
Hwang,(1) A. Kahn,(2) and B. Kippelen(1)†
(1)
Center for Organic Photonics and Electronics (COPE), School of Electrical and Computer
Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
(2)
Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA
Key words: polyvinylpyrrolidone, work function modification, inverted polymer solar cells, UV
treatment
Supplemental materials
†
Author to whom correspondence should be addressed; electronic mail: kippelen@ece.gatech.edu,
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Fig. S1. AFM images (amplitude) of the bare ITO, ITO/PVP (0.9 nm), ITO/PVP (4.0 nm) and ITO/PVP
(8.8 nm) substrates.
Fig. S2. Histograms of the phase distribution measured by AFM on the bare ITO, ITO/PVP (0.9
nm), ITO/PVP (4.0 nm) and ITO/PVP (8.8 nm) substrates.
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Fig. S3. Comparison of measured and modeled ellipsometric angles measured on a PVP film
deposited on silicon wafer.
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Fig. S4. Refractive index and extinction coefficient derived from ellipsometric mesurements on
a PVP film deposited on a silicon wafer. In red, the normalized UV lamp emission used in the
UV exposure experiments is also shown as a reference.
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