Table 1 Power output of UEHD for different energy-harvesting modes.

From: Imperceptible energy harvesting device and biomedical sensor based on ultraflexible ferroelectric transducers and organic diodes

Modea

Setupb

Isc (µA)c

Voc (V)d

Pout,max (mW cm−3)e

<Pout > (mW cm−3)f

(A) Manual bending

UFPT on silicone rubber

~0.9

~5.5

~3.2 (5 MΩ)

n/a

(B) Controlled bending

UFPT on bent silicone rubber (fixed on rail)

~3.0

~2.0

~1.0 (2.5 MΩ)

~0.1–0.2

(C) Pressing with fingertip

UFPT on bent silicone rubber (fixed on a rail)

~2.0

~3.5

~1.2 (2 MΩ)

~0.25

  1. aOperation mode; blayer setup used; cIsc: short-circuit current; dVoc: open-circuit voltage; emeasured output power density Pout for optimum load resistance (denoted in bracket) at ~2 Hz excitation frequency; the active UFPT volume is A∙Dtrans = 5.63 × 10−4 cm3, whereby A is the active transducer area of 2.25 cm2 and Dtrans is the total transducer thickness of 2.5 µm; fthe mean generated power density <Pout > is calculated by P = E ∆t−1, whereby E is the harvested energy stored in the capacitor C and is defined by E = ½ CVdc2.
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