Hole Mobility in Microcrystalline Chlorophyll a

Unravelling the Role of Water in Ultrafast Excited‐State Relaxation Dynamics within Nano‐Architectures of Chlorophyll a

“…Note that, the discussion presented here is based on the previous studies where the splitting of bands was attributed to the two different structural motifs; however, we do not rule out the possibility of excitonic interactions . In these assemblies the exciton most likely spans over the dimers only; this is further confirmed by the fact that temperature‐ and field‐dependent hole mobility studies within micro‐crystalline Chl‐a revealed increased hopping distance due to intervening water molecules . Therefore, these structures are not exact model of natural systems for that can sustain delocalized exciton over large length scale .…”

“…[28][29] In these assemblies the exciton most likely spans over the dimers only; this is further confirmed by the fact that temperature-and field-dependent hole mobility studies within micro-crystalline Chl-a revealed increased hopping distance due to intervening water molecules. [41] Therefore, these structures are not exact model of natural systems for that can sustain delocalized exciton over large length scale. [10][11] Nevertheless, excited state dynamics of these structures reveal the hitherto unexplored functional role of water molecules which is the main aim of the present work.…”

Biosupramolecular Nanowires from Chlorophyll Dyes with Exceptional Charge‐Transport Properties

“…So far, in contrast to the excellent excitontransport characteristics, [2,15] (bacterio-)chlorophyll dyes have not been demonstrated to possess outstanding charge-carriertransport properties. Based on modest hole-carrier mobilities of 10 À4 to 10 À5 cm 2 V À1 s À1 measured by time-of-flight measurements for microcrystalline chlorophyll a samples, [16] Kassi et al estimated an upper limit of 0.002 cm 2 V À1 s À1 for an ideally ordered solid-state material of these dyes. Microwaveconductivity experiments on a liquid-crystalline zinc chlorin derivative performed by our research group showed charge mobilities exactly in this range.…”

Biosupramolecular Nanowires from Chlorophyll Dyes with Exceptional Charge‐Transport Properties

“…So far, in contrast to the excellent exciton‐transport characteristics,2, 15 (bacterio‐)chlorophyll dyes have not been demonstrated to possess outstanding charge‐carrier‐transport properties. Based on modest hole‐carrier mobilities of 10 −4 to 10 −5 cm 2 V −1 s −1 measured by time‐of‐flight measurements for microcrystalline chlorophyll a samples,16 Kassi et al. estimated an upper limit of 0.002 cm 2 V −1 s −1 for an ideally ordered solid‐state material of these dyes.…”