| EPSRC Reference: |
GR/A11847/01 |
| Title: |
OPTICAL STUDIES OF ELECTRONIC PROCESSES AT ORGANIC SEM ICONDUCTOR HETEROJUNCTIONS |
| Principal Investigator: |
Silva, Professor C |
| Other Investigators: |
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| Department: |
Physics |
| Organisation: |
University of Cambridge |
| Scheme: |
Advanced Fellowship (Pre-FEC) |
| Starts: |
01 December 2001 |
Ends: |
01 January 2005 |
Value (£): |
212,302
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| EPSRC Research Topic Classifications: |
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| EPSRC Industrial Sector Classifications: |
| Electronics |
No relevance to Underpinning Sectors |
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Summary on Grant Application Form |
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Excited-state dynamics in conjugated polymers will be investigated with femtosecond transient absorption (FTA), transient photoluminescence (TPL), and quasi-steady-state photoinduced absorption (PIA) spectroscopies. The general approach to probe photocarrier population density will be via polaronic optical transitions, and by means of photocurrent measurements in photovoltaic diode architectures. Quasi-steady-state charged excitation spectra will be identified using cw PIA spectroscopy, and ultrafast charge transfer dynamics will be mapped by correlation of exciton decay rates via TPL spectroscopy, and polaron formation rates via FTA spectroscopy. Control of film morphology via processing parameters (solvent quality in precursor solutions, solvent evaporation rate during film spinning, etc.) and molecular structure (side chain substitution, etc.) will be explored systematically. Dissociation of high-energy excitons into electron-hole pairs will be studied by two-step sequential excitation, first to the lowest (odd parity) excitonic state, and then to a higher (even parity) state. This will be achieved with two tuneable and time-delayed laser pulses. The systematic elucidation of the charge-transfer character of the high-energy electronic states will be a focus of the research programme. Photovoltaic properties of electron donoracceptor systems will be correlated with the spectroscopic signatures of photoinduced charge transfer. These systems will include blends of conjugated polymers, and copolymers designed to achieve efficient intramolecular electron transfer.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.cam.ac.uk |