Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 3, Issue 9, Pages 1202-1207Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz300283h
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Funding
- Center for Interface Science: Solar Electric Materials (CISSEM)
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001084]
- Washington Research Foundation/NASA Space
- NSF
- National Defense Science and Engineering
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1010287] Funding Source: National Science Foundation
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We use electroabsorption spectroscopy to measure the change in built-in potential (V-BI) across the polymer photoactive layer in diodes where indium tin oxide electrodes are systematically modified using dipolar phosphonic acid self-assembled monolayers (SAMs) with various dipole moments. We find that V-BI scales linearly with the work function (Phi) of the SAM-modified electrode over a wide range when using a solution-coated poly(p-phenylenevinylene) derivative as the active layer. However, we measure an interfacial parameter of S = e Delta V-BI/Delta Phi < 1, suggesting that these ITO/SAM/polymer interfaces deviate from the Schottky-Mott limit, in contrast to what has previously been reported for a number of ambient processed organic-on-electrode systems. Our results suggest that the energetics at these ITO/SAM/polymer interfaces behave more like metal/organic interfaces previously studied in UHV despite being processed from solution.
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