Ground-state charge-transfer complex formation in hybridpoly(3-hexyl thiophene):titanium dioxide solar cells

The existence of a ground-state charge-transfer (CT) complex in a conjugated polymer:metal oxide nanoparticle bulk heterojunction photovoltaic cell is demonstrated by Fourier-transform photocurrent spectroscopy (FTPS). The CT complex between poly(3-hexylthiophene) (P3HT) and titanium dioxide ( Ti O...

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Bibliographic Details
Published in:Applied physics letters 2008-12, Vol.93 (22), p.223302-223302-3
Main Authors: Haeldermans, I., Vandewal, K., Oosterbaan, W. D., Gadisa, A., D'Haen, J., Van Bael, M. K., Manca, J. V., Mullens, J.
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Summary:The existence of a ground-state charge-transfer (CT) complex in a conjugated polymer:metal oxide nanoparticle bulk heterojunction photovoltaic cell is demonstrated by Fourier-transform photocurrent spectroscopy (FTPS). The CT complex between poly(3-hexylthiophene) (P3HT) and titanium dioxide ( Ti O 2 ) is characterized by a weak additional photocurrent band (onset 1 eV ) in the FTPS spectra, situated below the conjugated polymer bandgap of 2 eV . The presence of CT interaction between P3HT and Ti O 2 in relation to frontier orbital alignment is discussed, as well as the contribution of a sub-bandgap interfacial CT state to the electron transfer process in P 3 HT : Ti O 2 solar cells.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3041633