How is a TENG represented in an equivalent circuit model?

A Triboelectric Nanogenerator (TENG) is represented in an equivalent circuit model as either a voltage source in series with an internal impedance or a current source in parallel with an internal impedance. The voltage source model is often used for open-circuit conditions, while the current source model is used for short-circuit conditions. The internal impedance typically includes a capacitance and a resistance. The capacitance co....