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Billions of everyday objects could become part of the Internet of Things(IoT) by augmentation with low-cost, long-range, maintenance-free wirelesssensors. Radio Frequency Identification (RFID) is a low-cost wirelesstechnology that could enable this vision, but it is constrained by shortcommunication range and lack of sufficient energy available to power auxiliaryelectronics and sensors. Here, we explore the use of flexible perovskitephotovoltaic cells to provide external power to semi-passive RFID tags toincrease range and energy availability for external electronics such asmicrocontrollers and digital sensors. Perovskites are intriguing materials thathold the possibility to develop high-performance, low-cost, optically tunable(to absorb different light spectra), and flexible light energy harvesters. Ourprototype perovskite photovoltaic cells on plastic substrates have anefficiency of 13% and a voltage of 0.88 V at maximum power under standardtesting conditions. We built prototypes of RFID sensors powered with theseflexible photovoltaic cells to demonstrate real-world applications. Ourevaluation of the prototypes suggests that: i) flexible PV cells are durable upto a bending radius of 5 mm with only a 20 % drop in relative efficiency; ii)RFID communication range increased by 5x, and meets the energy needs (10-350microwatt) to enable self-powered wireless sensors; iii) perovskite poweredwireless sensors enable many battery-less sensing applications (e.g.,perishable good monitoring, warehouse automation)

Introducing flexible perovskites to the IoT world using photovoltaic-powered wireless tags