Performance improvement of perovskite light-emitting devices via transfer-printed nanostructured hole transport layers

The performance of perovskite light-emitting devices (PeLEDs) is frequently restricted by plasmonic losses at the metal–organic layer interface. Integrating micro-nano structures to mitigate these losses is a promising yet challenging strategy. In this work, we employed a transfer-printed nanostructured hole transport layer (HTL) to achieve the nanostructured PeLEDs. This approach creates a periodic metal-dielectric interface that effectively outcouples non-radiative surface plasmon polariton (SPP) modes into radiative emission. Simultaneously, the nanostructured HTL spatially confines the perovskite film’s nucleation and growth, yielding enhanced grain uniformity and surface coverage. Leveraging this dual optimization, all-inorganic CsPbBr3 PeLEDs achieve luminance and efficiency enhancements of 35.67% and 64.38%, respectively. These results demonstrate that transfer-printed nanostructures offer an effective pathway for optimizing both light extraction and film morphology in PeLEDs.