Blumröder, U.; Hempel, H.; Füchsel, K.; Hoyer, P.; Bingel, A.; Eichberger, R.; Unold, T.; Nolte, S.: Investigating subsurface damages in semiconductor-insulator-semiconductor solar cells with THz spectroscopy. Physica Status Solidi A 214 (2017), p. 1600590/1-8
10.1002/pssa.201600590

Abstract:
The influence of near-surface crystal damage on carrier dynamics in silicon has been investigated with optical-pump THzprobe and THz emission studies. The surface damage is caused by a plasma process used for the fabrication of the ultrathin insulator within semiconductor–insulator–semiconductor (SIS) solar cells. The ion bombardment during the plasma process introduces a highly damaged subsurface region. Furthermore, the integration of positive interface charges leads to the formation of a depletion region that can be detected via the emitted THz radiation. The results are compared with classic I–U-characterization demonstrating that THz spectroscopy can be used as a supplementary tool for the investigation of processinduced surface damages.