Figure 4.

The response and performance measurements of a 100‐leaf‐TEG at room temperature driven by human body heat. a) Proof‐of‐concept of 100‐leaf‐TEG and three actual energy harvesting mode from the human body heat: palm touching, mouth blowing, and worn on the arm. We touched 100‐leaf‐TEG with palm every 20 s for 10 s; and blew it with mouth for 5 s every 10 s. Open‐circuit voltage and the corresponding P _max of b) the palm touching mode and c) the mouth blowing mode. d) Open‐circuit voltage and corresponding φ _th, and e) power output of the 100‐leaf‐TEG module on an arm while walking and standing situation. The internal resistance of 100‐leaf‐TEG is 93Ω. f) The normalized output performance of leaf‐TEG compared with several literature data points. A in f) is the device area including the substrate.