[9a-M112-1~12] 6.6 Probe Microscopy

[9a-M112-10] Role of tunnel junction in light-modulated STS on solar cells

Kazutaka Shinohara¹, Sora Koshiji¹, Aya Suzuki¹, 〇Osamu Takeuchi¹, Atsushi Taninaka¹, Shoji Yoshida¹, Hidemi Shigekawa¹ (1.Univ. of Tsukuba)

Keywords:solar cell, scanning tunneling microscopy

When local efficiencies of solar cells are characterized by light-modulated scanning tunneling spectroscopy, the electric properties of the samples are measured via a tunnel junction with a large resistance. Thus, a finite voltage drop at the junction is unavoidable in photocurrent measurements. We show that the voltage drop can be reasonably reduced by reducing the tip-sample distance and discuss the residual effect of the tunnel junction properties to the local characterization of solar cells.