Time-Domain-Based Modeling of Carrier Transport in Lateral p-i-n Photodiode

Carrier transport mechanism in a lateral p-i-n photodiode (PD) has been described analytically in time domain by adopting a coordinate transformation, where carriers are treated to be stationary in the coordinate system. The developed model correctly predicts the measured delayed response of a PD to a 100ps-Gaussian pulse input, which is not observed in models employing stationary and constant electric field approximations. The inherent PD delay predicted by the model is reflected in the output transient characteristics of an inverter circuit with the PD response used as input.