Insight into perovskite light-emitting diodes based on PVP buffer layer

Red Efficient Perovskite Light-Emitting Diodes Assisted with PEIE

“…The XRD patterns of the films shown in Figure S1 indicate that the addition of PEIE does not affect the crystalline structure of the perovskite. Similar to other polymer additives, − the PEIE molecule does not enter the crystal lattice because of its large size but instead remains in the grain boundaries and surfaces of perovskite grains. Figure c shows the fluorescence photographs of perovskite films with varying amounts of PEIE under 365 nm UV excitation.…”

“…20,21 At present, small molecule additives have been extensively studied. 22,23 Polymers like PMMA, 24 PVP, 25 GSET, 26 and PVDF 27 can regulate the crystallization process and enhance the stability of thin films more effectively than volatile and dispersive small molecule additives. In addition, they can be fixed around the perovskite crystal after crystallization to further improve the stability of the films.…”

“…Therefore, reducing the grain size of perovskite films while also carefully passivating defects is a crucial strategy for improving the efficiency of PeLEDs. Various types of organic or inorganic additives are typically introduced into the perovskite precursor solution or antisolvent to simultaneously influence grain growth during the film formation process, passivate the defect, and ultimately achieve device efficiency and stability. , At present, small molecule additives have been extensively studied. , Polymers like PMMA, PVP, GSET, and PVDF can regulate the crystallization process and enhance the stability of thin films more effectively than volatile and dispersive small molecule additives. In addition, they can be fixed around the perovskite crystal after crystallization to further improve the stability of the films.…”

Advancements in Interfacial Engineering for Perovskite Light‐Emitting Diodes

“…They provide protection against environmental factors, such as air and moisture, which can accelerate perovskite unfavourable degradation. [12] Simultaneously, they act as an energy barrier within the alignment structure, minimizing the flow of electrons and holes through the emissive layer in the opposite direction, thereby reducing unwanted nonradiative recombination and improving overall device efficiency. [13] The primary objective of PeLED structural design is to enhance the transport of electrons and holes from the cathode and anode while simultaneously impeding electron flow through the HTL and hole transfer through the ETL.…”

“…Furthermore, these HTL and ETL layers serve a dual purpose. They provide protection against environmental factors, such as air and moisture, which can accelerate perovskite unfavourable degradation [12] . Simultaneously, they act as an energy barrier within the alignment structure, minimizing the flow of electrons and holes through the emissive layer in the opposite direction, thereby reducing unwanted nonradiative recombination and improving overall device efficiency [13] …”