Inkjet Printing of Perovskites for Breaking Performance–Temperature Tradeoffs in Fabric‐Based Thermistors

A novel low‐temperature route is developed for inkjet printing of the perovskite Cs2SnI6, to create wearable negative‐temperature‐coefficient thermistors with unprecedented performance on thermally sensitive fabrics. A low processing temperature of 120 °C is achieved by creating a stable and printable ink using binary metal iodide salts, which is thermally transformed into dense Cs2SnI6 crystals after printing. The optimally printed Cs2SnI6 shows a temperature measurement range up to 120 °C, high sensitivity (4400 K), and temperature coefficient of resistivity (0.05 °C−1), and stability under ambient environmental conditions and bending. The approach breaks a critical tradeoff that has hindered wearable fabric‐based thermistors by enabling damage‐free fabrication of devices with commercially comparable performance, evincing significant applications in multifunctional textiles and beyond. A simple low‐temperature route is created for inkjet printing perovskite‐based thermistors directly on woven fabric. The thermistors have high performance on par with commercial devices but without the typical issues of thermal damage or increased stiffness of the fabric. The mechanical and environmental stability of the thermistor enables high‐sensitivity temperature sensing in wearable multifunctional textiles.