Anisotropy of transient photoconductivity in functionalized pentacene single crystals

作者：Ostroverkhova O^*; Cooke D G; Hegmann F A; Tykwinski R R; Parkin S R; Anthony J E

来源：Applied Physics Letters, 2006, 89(19): 192113.

DOI：10.1063/1.2387135

We report on the anisotropy of transient photoconductivity in functionalized pentacene single crystals using ultrafast optical pump-terahertz probe techniques. Functionalized pentacene crystals with tri-isopropylsilylethynyl (TIPS) and tri-ethylsilylethynyl (TES) side groups were studied, characterized by crystal structures favoring two-dimensional and one-dimensional charge transports, respectively. Charge carrier mobility anisotropies in the a-b plane of 3.5 +/- 0.6 and 12 +/- 6 were obtained in the TIPS and TES crystals, respectively, consistent with the degree of pi overlap along different directions in the crystals. A photogeneration efficiency anisotropy was also observed in both types of crystals.

• 出版日期2006-11-6