Fig. 6.

a SEM image of electrodeposited Bi₂Te₃ nanocrystals at a potential of 0.02 V (scale bar: 500 nm). b Corresponding σ (black circle), S (red circle), and PF (blue circle) of the flexible TE generators (FTEGs) with Bi₂Te₃ films deposited at different potentials (V vs. Ag/AgCl). c Output power per weight of 1-couple (filled black circle) and 5-couples (open black circle) and output power of 1-couple (red circle) and 5-couples (blue circle) of the pn-FTEGs over a temperature gradient (ΔT). Adapted with permission from Ref. [96]. (Color figure online)