“…WTEG can be divided into lateral and vertical structures depending on the shape of the thermoelectric (TE) leg. Lateral type WTEGs with the TE legs arranged laterally along the substrate are fabricated by printing, [ 2 , 3 , 4 , 5 ] coating, [ 6 , 7 , 8 , 9 , 10 ] or depositing [ 11 , 12 ] flexible organic TE materials such as Poly(3,4‐ethylenedioxythiophene) : poly(styrenesulfonate) (PEDOT:PSS), [ 6 , 13 , 14 , 15 , 16 ] carbon nanotube (CNT) composites, [ 17 , 18 , 19 , 20 , 21 ] fullerene derivatives, [ 22 , 23 , 24 ] or TE inks made of rigid inorganic TE nanoparticles on flexible substrates. [ 11 , 12 ] Lateral type WTEGs with long and thin TE legs have high Δ T .…”