Self-powered pressure and light sensitive bimodal sensors based on long-term stable piezo-photoelectric MAPbI3 thin films

Abstract

Chemical vapor deposited CH₃NH₃PbI₃ (MAPbI₃) thin films showed a long-term stability of approximately one month after exposure to air at room temperature. Self-powered sensors using 500 nm-thick MAPbI₃ films were demonstrated for pressure and light sensitive bimodal sensor applications. The generated output voltage was attributed to an intrinsic piezoelectric property of the MAPbI₃ films and their sensitivities for sensors were approximately 8.34 mV kPa⁻¹ and 0.02 nA kPa⁻¹. The output current generated in the release mode showed a strong dependence on the light power irrespective of the applied pressure, revealing the light-sensitive effect of the MAPbI₃ films. The response time of bimodal sensors for applied pressure and light power was approximately 0.066 and 0.320 s at an applied pressure of 30 kPa, respectively. The CVD-MAPbI₃ films have attracted attention for simultaneous realization of both pressure and light sensitive bimodal sensor applications.