Fig. 4: Device fabrication and power generation performance.

a Fabrication flow of a fully inkjet-printed Ag₂Se-based flexible device. b Digital photographs of devices consisting of thermoelectric legs with the same geometrical ratio but the width and length ranging from micrometers to millimeters. c Digital photograph of a fully inkjet-printed Ag₂Se-based flexible device consisting of 160 Ag₂Se legs. d Comparison of the filling factor and leg integration density of state-of-the-art in-plane flexible devices fabricated by different methods. e Output voltage and power as a function of current at different temperature gradients. f Output voltage and power as a function of the number of Ag₂Se legs. g Comparison of the normalized voltage and normalized power of state-of-the-art in-plane flexible devices. h Change of device resistance after continuously repeated bending at different bending radii.