A Current Model for FOI FinFETs with Back-Gate Bias Modulation

The current model of FOI (Fin-On-Insulator) FinFETs was developed, in which the back-channel current was modeled as a parasitic transistor. Both the experimental and TCAD simulation results validated its accuracy of the proposed model under different back-gate biases. This current model exhibits a wide valid range for various geometry parameters including fin width, fin height, sidewall inclination angle and fin bottom angle. It was demonstrated that the fin bottom angle had a great influence on the channel current when a positive back-gate bias applied, which may be useful to boost the drive capability of FOI FinFETs. The proposed model can help to build BSIM model and instruct devices designer to optimize the performance of the devices.