Line Plot from Scientific Research

Capacitance C−Cgeo extracted from simulated admittance spectroscopy measurements as a function of voltage for Urbach energies EU of 30, 55, and 80 meV. The dashed lines indicate an exponential with the corresponding Urbach energy. For both operating conditions, a) under illumination at open circuit and b) in the dark, the quasi-Fermi level splitting can be approximated by the applied voltage and thereby the chemical capacitance can indicate the respective Urbach energy.

DOI