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

Abstract

Abstract A novel low‐temperature route is developed for inkjet printing of the perovskite Cs 2 SnI 6 , 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 Cs 2 SnI 6 crystals after printing. The optimally printed Cs 2 SnI 6 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.