Effect of the depletion layer capacitance on the mobility determination using transient current extraction of doping-induced charge carriers

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Oskar J. Sandberg, Mathias Nyman, Staffan Dahlström, Ronald Österbacka
Publication year: 2018
Journal: Journal of Photonics for Energy
Volume number: 8
Issue number: 3
Start page: 032208


We use drift-diffusion simulations to clarify the effect of a steady-state depletion layer on the mobility determination using the charge extraction by linearly increasing voltage (CELIV) technique in case of extraction of doping-induced charge carriers. Accounting for the steady-state depletion layer gives rise to a saturation of the extraction current transients to a capacitive regime limited by the depletion layer capacitance. As a consequence of this saturation effect, the standard mobility formulas can overestimate the mobility by several orders of magnitudes if the voltage ramp-up rate is not sufficiently large. Based on the simulations, we present an expression to extract the mobility from CELIV, which takes the displacement current of the depletion layer into account.


Last updated on 2020-12-08 at 04:24