| Advances in Organic-Based Electronic Devices |
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| Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio | |
| Feb 01 2008 | |
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Page 3 of 3
Advertisement: In the body of research reported here, the mechanisms underlying the increases in efficiency in P3HT/PCBM-based cells were investigated in more detail. The structural effect of self-organization by slow growth was examined by atomic force microscopy. Transport properties were studied by fitting current-versus-voltage characteristics measured in the dark to the corresponding characteristics predicted by a space-charge-limited-current. Single-carrier (hole only and electron only) devices were fabricated for use in determining the charge-carrier mobilities in the active layers. The photocurrent behaviors of PV devices under reverse bias were examined on the basis of Onsager’s theory of ion-pair dissociation in weak electrolytes; reasonable fits of the theoretical to the experimental photocurrent- versus-bias-potential data were obtained by varying the parameters involved in the model. The effect of the growth rate on the dissociation efficiency of electron-hole pairs under short-circuit conditions, and the consequent effect on device performance, were examined. This work was done by Yang Yang of the University of California Los Angeles (UCLA) for the Air Force Research Laboratory. This Brief includes a Technical Support Package (TSP).
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