20 April 2018 Effect of the depletion layer capacitance on the mobility determination using transient current extraction of doping-induced charge carriers
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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.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Oskar J. Sandberg, Mathias Nyman, Staffan Dahlström, 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 Submission: Received 27 February 2018; Accepted 30 March 2018
Submission: Received 27 February 2018; Accepted 30 March 2018
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