Optical and Electrical Properties of Formamidinium Lead Bromide Perovskite LEDs

The need for more energy-saving optoelectronics is ever-present. Perovskite light-emitting diodes (PeLEDs) are promising candidates in this regard. They are efficient, easily tunable, and have high color purity. Even more important, they do not require the energy-costly fabrication conditions and processes that traditional semiconductors do. PeLEDs' simple solution-based processing, even at ambient temperatures and pressures, is found to produce highly crystalline structure. However, perovskite devices suffer from short lifetimes. This work studies the optical and electronic properties associated with the degradation of formamidinium lead bromide PeLEDs. Specifically, we aim to optimize device architecture and efficiency, while also measuring the degradation of such optimizations. We use photothermal deflection spectroscopy (PDS) to longitudinally investigate trap states in the material as a function of device architecture. Fourier-Transform Infrared Spectroscopy also provides insight to the degradation of our devices.