Experiments sensitive to the anisotropy of electrical transport in amorphous hydrogenated silicon (a-Si:H) are reviewed. While steady-state conductance measurements are ambiguous, photocurrent transient experiments present a "geometry problem;" orders of magnitude separate mobility-lifetime product estimates measured parallel and perpendicular to the growth axis. An experiment is proposed to ascertain whether this difference is due to microscopically anistropic photocarrier transport.
ASJC Scopus subject areas
- Ceramics and Composites
- Electronic, Optical and Magnetic Materials