Fig. 5: Flexibility of screen-printed Ag2Se films and performance of as-fabricated device.
From: Flexible Ag2Se-based thin-film thermoelectrics for sustainable energy harvesting and cooling
a Measured normalized resistance change (ΔR/R0) of the Ag2Se thin films with different Te contents (x = 0, 2.5, 5, 7.5, and 10 wt.%) as a function of different bending cycles at 5 mm bending radius (r). The inset depicts the flexible film with r of 5 mm. b Schematic illustration of the size and structure of as fabricated device. c Experimental output voltages (V) and output powers (P) versus loading current (I) with different temperature differences (ΔTs). d Determined output power densities (ω) as a function of ΔT. The inset displays the infrared photograph showing the temperature distribution on the as-fabricated device after applying a ΔT. e Measured ΔR/R0 of as-fabricated device versus different r with different bending cycles. The inset depicts the as-fabricated device with a r of 8 mm. f Photograph of as-fabricated device worn on a human arm and can provide open-circuit voltage (Voc) of 10.88 mV. g Experimental Voc of the device worn on a human arm during sitting and walking as a function of time (0 ~ 130 s). The inset displays an infrared photograph showing the temperature distribution of the device worn on a human arm while seated. h The infrared photograph shows the temperature distribution of the device functioning as a cooler after an input current of 69.8 mA is applied. i Maximum cooling performance (ΔTmax) of the device as a function of input current.
