Next, we turned to exploring the role of the applied bias on the photocurrent (Figure ), showing a flip in the photocurrent direction as a function of the voltage magnitude. Whereas above we described a decrease in photocurrent at a high (1.5 V) bias, the application of lower than 0.8 V biases results in an increase in the photocurrent. We also measured the current while sweeping the voltage (I-V) between 0 V to 1.5 V under light and dark conditions (Figure ), which further supports our observation of flipping in the current direction as a function of applied bias, whereas at low biases, the light current is higher than the dark current, and vice versa at higher biases.