Axially Bound Ruthenium Phthalocyanine Monolayers on Indium Tin Oxide: Structure, Energetics, and Charge Transfer Properties
| Autor: | Dominic V. McGrath, Luis E. Oquendo, Ramanan Ehamparam, Kai-Lin Ou, Ambjorn Brynnel, Michael W. Liao, S. Scott Saavedra, Neal R. Armstrong |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Organic solar cell business.industry Oxide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Indium tin oxide chemistry.chemical_compound chemistry Attenuated total reflection Electrode Monolayer Phthalocyanine Surface roughness Optoelectronics General Materials Science 0210 nano-technology business |
| Zdroj: | ACS applied materialsinterfaces. 9(34) |
| ISSN: | 1944-8252 |
| Popis: | The efficiency of charge collection at the organic/transparent conducting oxide (TCO) interface in organic photovoltaic (OPV) devices affects overall device efficiency. Modifying the TCO with an electrochemically active molecule may enhance OPV efficiency by providing a charge-transfer pathway between the electrode and the organic active layer, and may also mitigate surface recombination. The synthesis and characterization of phosphonic acid-ruthenium phthalocyanine (RuPcPA) monolayer films on indium tin oxide (ITO), designed to facilitate charge harvesting at ITO electrodes, is presented in this work. The PA group was installed axially relative to the Pc plane so that upon deposition, RuPcPA molecules were preferentially aligned with the ITO surface plane. The tilt angle of 22° between the normal axes to the Pc plane and the ITO surface plane, measured by attenuated total reflectance (ATR) spectroscopy, is consistent with a predominately in-plane orientation. The effect of surface roughness on RuPcPA orientation was modeled, and a correlation was obtained between experimental and theoretical mean tilt angles. Based on electrochemical and spectroelectrochemical studies, RuPcPA monolayers are composed predominately of monomers. Electrochemical impedance spectroscopy (EIS) and potential modulated-ATR (PM-ATR) spectroscopy were used to characterize the electron-transfer (ET) kinetics of these monolayers. A rate constant of 4.0 × 10 |
| Databáze: | OpenAIRE |
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