In the following, the influence of applying different Ubias between GE and CE onto the cycling characteristics and rectification performance of the W-Cap was analyzed. First, negative Ubias were applied and varied stepwise (Figure ). By applying negative Ubias , the cut-off voltage and the whole working window of the W-Cap is shifted stepwise and almost linearly (-0.39 V shift/ -1 V applied Ubias ) to more negative voltage values with decreasing Ubias (higher negative bias values) (Figure and). The reason for this behavior can be found in the potential distribution of WE, CE, and GE (Figure ). When a negative Ubias is applied to GE, the potential of GE is shifted to more negative and the potential of CE to more positive values to fulfill the applied voltage difference. Because the GE-CE half-system shares the same CE in the W-Cap also the WE is following the potential shift of the CE (to more positive values).