Pulsed photoconductivity of chlorophyll a

摘要

Abstract: Pulsed photoconduction study of Al/Chlorophyll $alpha@/Al sandwich cells has been carried out in order to investigate the charge transport in chlorophyll $alpha (CHl $alpha@). The charge carriers are generated close to the electrode by laser pulse (800 ps) of strongly absorbed wavelength 750 nm by Chl $alpha@. The results suggest that the trapping of photogenerated charge carriers is quite significant. The electron transient current is practically absent, and the hole current signal rapidly decreases due to deep trapping. The signal shows a biexponential behavior in time period of approximately 50 $mu@s which could be related to the presence of two trapping species. In millisecond time range, the hole current shows a long tail in addition to the fast component. The analysis of the long tail seems to suggest the addition to the fast component. The analysis of the long tail seems to suggest the dispersive hole transport phenomenon in microcrystalline Chl $alpha@. !