Interface Modification and Stability of Halide Perovskite Devices—From Solar Cells to LEDs

Perovskite semiconductors, though often described as defect-tolerant, are not defect-free. Passivating interfaces in perovskite solar cells and LEDs is essential for enhancing performance, including improving open circuit voltage and improving stability. We explore how scalable interfacial layers can improve photovoltaic performance and examine the interplay between chemical passivation of perovskite surfaces (removing dangling bonds) and altering the electronic coupling between the electrode and perovskite. We show how surface passivation can improve both bias- and photoinduced-degradation of the perovskite in solar cells, and show how interface optimization can lead to significant improvements in brightness for perovskite quantum dot light emitting diodes (QLEDS). Finally, we address the impact of interface passivation on reverse bias stability in solar cells, demonstrating improvements to reverse bias performance under both bias and current stress conditions.