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

Oskar J. Sandberg; Mathias Nyman; Staffan Dahlström; Ronald Österbacka

doi:10.1117/1.JPE.8.032208

20 April 2018 Effect of the depletion layer capacitance on the mobility determination using transient current extraction of doping-induced charge carriers

Oskar J. Sandberg, Mathias Nyman, Staffan Dahlström, Ronald Österbacka

Author Affiliations +

Journal of Photonics for Energy, Vol. 8, Issue 3, 032208 (April 2018). https://doi.org/10.1117/1.JPE.8.032208

Abstract

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.

Citation Download Citation

Oskar J. Sandberg, Mathias Nyman, Staffan Dahlström, and Ronald Österbacka "Effect of the depletion layer capacitance on the mobility determination using transient current extraction of doping-induced charge carriers," Journal of Photonics for Energy 8(3), 032208 (20 April 2018). https://doi.org/10.1117/1.JPE.8.032208

Received: 27 February 2018; Accepted: 30 March 2018; Published: 20 April 2018

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