Excitons and fundamental transport properties of diamond under photo‐injection (Phys. Status Solidi A 10∕2016)
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2016-10-01 |
| Journal | physica status solidi (a) |
| Authors | N. Naka, H. Morimoto, Ikuko Akimoto |
| Institutions | Kyoto University, Wakayama University |
| Citations | 2 |
Abstract
Section titled “Abstract”Diamond is one of the emergent high-mobility materials that are promising for the use in future power electronics and optoelectronics. Both free carriers and excitons, i.e., electron-hole pairs bound by the Coulomb force, play important roles in the mobility of diamond. However, the transport measurement for doped diamond has long been limited by carrier freezing at deep impurity levels below 80 K. Recently, challenges were made to utilize photoexcited carriers and excitons in undoped diamond. A series of investigations performed in a wide temperature range and various excitation schemes are reviewed in the Feature Article by N. Naka et al. (pp. 2551-2563). The lower panels of the cover image represent extremely high exciton diffusivity measured at 7 K by timeresolved photoluminescence imaging. The upper panel shows a cyclotron resonance spectrum, which provides effective mass values and mobility of free carriers originating from exciton binary collisions. The new pieces of knowledge on the interplay between excitons and free carriers will lay a foundation for the optimum design of diamond-based devices.