Organic donor/acceptor photovoltaics: The role of C[sub 60]/metal interfaces

Melzer, Christian; Krasnikov, Victor V.; Hadziioannou, Georges
May 2003
Applied Physics Letters;5/5/2003, Vol. 82 Issue 18, p3101
Academic Journal
The photovoltaic properties of thin films based on donor/acceptor heterojunctions, prepared by means of either consecutive evaporation or co-evaporation, and sandwiched between asymmetric contacts are investigated. (E,E,E,E)-1,4-bis[(4-styryl)styryl]-2-methoxy-5-(2'-ethylhexoxy)benzene (MEH-OPV5) and Buckminster fullerene C[sub 60] are employed as donor and acceptor materials, respectively. Current-voltage measurements and impedance spectroscopy on the donor and the acceptor single-layer cells suggest the presence of a strong dipole layer at the C[sub 60]/metal interfaces. The correlation between the photovoltaic performances and film morphologies is discussed.


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