Molecular Interface Engineering by Mixed Self-Assembled Monolayers for Efficient and Stable Perovskite LEDs
발표자
손연지 (광주과학기술원)
연구책임자
김호범 (광주과학기술원)
공동저자
손연지 (광주과학기술원), 김호범 (광주과학기술원)
초록
내용
Perovskite LEDs(PeLEDs) are gaining significant attention as next-generation LEDs due to their excellent optoelectronic properties. Self-assembled monolayers(SAMs) are widely used in the HTL to improve charge injection by reducing interfacial trap states and tailoring energy level alignment with the perovskite emitter. In particular, bulky SAMs with multiple anchoring groups can improve interfacial stability through strong binding to the underlying metal oxide. However, their large molecular size can cause steric hindrance, which limits molecular packing density, results in non-uniform interface coverage, and reduces charge injection efficiency. To address these limitations, we introduce small SAM into the bulky SAM system. The mixed-SAM retains the strong anchoring capability of the bulky SAM while improving interfacial coverage through denser molecular packing. This more uniform interface and improved hole transport, in turn, enhance the EQE and operational stability of green PeLEDs.