fig6

Figure 6. (A) Illustration of R2R printing of flexible thermoelectric devices. R2R printed thermoelectric films on (B) UV-treated plastic substrate and (C) plasma-treated plastic substrate. The inset images show the contact angle between substrate and the inks^[91]; (D) Illustration of the rolled-up final device^[92]; (E) Printed electrode cleaned by electron beam; (F) Complete TEG on pristine electrodes; (G) generated output power as a function of temperature difference^[93]. R2R: Roll-to-roll; TEG: thermoelectric generator; UV: ultraviolet.