The film thickness of pure and modified terpolymer film used for short-circuit current measurement are 76.6 µm and 65 µm, respectively, while for power characterization, they are 75.6 µm and 60.1 µm, respectively. The length and width of all polymer films with electrode are 5 cm and 1 cm. For all of the samples, 1 cm is clamped for electrical contact, and thus the effective length of films used for energy harvesting is 4 cm.
The definition of applied strain for energy harvesting
As shown in Fig. S1, the polymer film was clamped by two ends: one end was clamped to a fixed clamp (left side), and the other side was clamped to a mobile side (right side) with an electrically precisely controlled motor (1mm/100 mV). To apply the desired strain, 1% for example, we first measured the effective length of the polymer film between the two clamps, 4 cm for example, and secondly, a sinus electrical signal with amplitude of 2 mV (min voltage 0 mV) generated by a function generator was applied on the motor.
References S1 Z. Y. Cheng, V. Bharti, T. B. Xu, Haisheng Xu, T. Mai, and Q. M. Zhang, Sensors and Actuators A: Physical 90 (1–2), 138 (2001).
a)a) Author to whom correspondence should be addressed. Electronic mail: jean-fabien.capsal@insa-lyon.fr
