The measurements of hole mobility in microcrystalline chlorophyll a (Chl a) as a function of temperature and field have been carried out. The results are described in terms of disorder formalism of charge transport put forward by Bässler and co-workers. Noteworthy feature of the study is the negative field dependence of the mobility at room temperature. This is explained on the basis of the presence of large positional disorder parameter, Σ, compared to the energetic disorder, σ, in microcrystalline Chl a. Their respective values are ≈4 and 77 meV. The intercalation of a water molecule that holds the two Chl a molecules together to form microcrystalline Chl a is a possible responsible for the increased hopping site distances that leads to larger Σ and, thus, to the negative field dependence of the mobility.
|Original language||English (US)|
|Number of pages||9|
|Journal||Physica Status Solidi (B) Basic Research|
|State||Published - Aug 2000|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics