Credit: Nature Materials
The three images shown here are microscope camera screen shots, showing the one-step turn-off process for an OECT. Figures on the left indicate time. The OECT appears dark at the moment of switch-off because it is loaded with charge-bearing particles — also known as being fully “doped.” When the OECT is switched off, the number of charge-bearing particles drops rapidly across the transistor, lightening its color.