Figure S9. Temperature characteristics of the piezoresistive sensor. a) I-V curves of the sensor at different temperatures under 200 g pressure/weight. b) I-V curves of the sensor at different temperatures under 500 g pressure/weight.
Figure S9 shows the temperature characteristics of the piezoresistive sensor. It can be found that the output resistance of the piezoresistive sensor will increase when the temperature increases under fixed pressure (200 g or 500 g), implying that this sensor has a thermal shift issue. This issue may be avoided by hardware compensation circuit, such as compensation circuit of self-balancing bridge[1]and operational amplifier compensation circuit.[2]