Suppressing Ion Interdiffusions in Halide Perovskite Devices

Halide perovskites showed great potential for cost-effective optoelectronics. Low activation energy of ion migration, however, posed a challenge to implement viable devices with desirable lifetime. Not only were the ions mobile within the perovskite layer, they would also diffuse across heterogeneous interfaces in devices and degrade the charge transport layers and electrodes. In this work, we demonstrated that ultrathin, inorganic interlayers could suppress such interdiffusions without compromising the optoelectronic performance of the devices.