Rational Energy Band Alignment and Au Nanoparticles in Surface Plasmon Enhanced Si‐Based Perovskite Quantum Dot Light‐Emitting Diodes

Abstract

Combining inorganic perovskite quantum dots (IPQDs) devices with Si platform is an interesting topic since it is helpful for realizing the optoelectronic integration as well as the multiple‐functional electronics in a compact and lightweight format. However, the poor energy band alignment between the IPQDs and Si limits the device performance, such as the emitting efficiency. Here, a light‐emitting diodes (LEDs) structure is proposed by inserting a poly‐TPD (poly[N,N′‐bis(4‐butylphenyl)‐N,N′‐bis(phenyl)‐benzidine]) layer between the n‐type IPQDs and the p‐type Si substrate. The light‐emitting diode based on CsPbI3 quantum dots reaches an output power density of 1.68 mW cm−2 with external quantum efficiency of 0.91%, which is enhanced by 34‐fold compared with the reference device. Similar emission enhancement is also observed in the device based on CsPbBr3 quantum dots but the output power density is only 0.6 mW cm−2. In order to further improve the emission intensity of CsPbBr3 quantum dots devices, Au nanoparticals (Au NPs) are introduced into the hole injection layer, the output power density increases to 1.2 mW cm−2, which is induced by the localized surface plasmon resonance coupling between Au NPs and CsPbBr3 excitons. The results demonstrate that high‐efficiency and stable Si‐based perovskite LEDs can be realized by rational optical and electronic design.

Silver nanoparticles enhanced luminescence and stability of CsPbBr3 perovskite quantum dots in borosilicate glass

“…As the amount of Ag doping increases, the lifetime of the sample gradually decreases. This can be explained by the addition of a high‐rate recombination channel due to the existence of exciton‐surface plasmonic coupling . The shortened lifetime caused by Ag doping strongly proves that the band‐edge transition of CsPbBr 3 QDs during doping creates a new nonradiative channel.…”

“…This can be explained by the addition of a high-rate recombination channel due to the existence of exciton-surface plasmonic coupling. 31 The shortened lifetime caused by Ag doping strongly proves that the band-edge transition of CsPbBr 3 QDs during doping creates a new nonradiative channel. The shortening of the lifetime also indicates why the excessive Ag-doped samples photoluminescence is weakened.…”

“…Liu et al introduced Au nanoparticles (Au NPs) into CsPbBr 3 QDs and Si‐based hole injection layers, and the output power density increased from 0.6 to 1.2 mW/cm 2 . Efficient and stable silicon‐based perovskite LEDs were achieved through sound optical and electronic design . These results indicate potential for improving LED performance by properly introducing plasmonic nanostructures into perovskite nanoparticles.…”

“…Efficient and stable silicon-based perovskite LEDs were achieved through sound optical and electronic design. 31 These results indicate potential for improving LED performance by properly introducing plasmonic nanostructures into perovskite nanoparticles. Precious metal nanoparticles do not produce strong fluorescence emissions, but they can interact strongly with light in a specific wavelength band.…”

Low Power Consumption Red Light-Emitting Diodes Based on Inorganic Perovskite Quantum Dots under an Alternating Current Driving Mode

“…We purchased PbI 2 , Cs 2 CO 3 , ZnCl 2 , oleylamine, and cyclohexane from Aladdln Industrial Corporation (Shanghai, China) and purchased 1-octadecene and oleic acid from Alfa Aesar (Shanghai, China). The experimental details of synthesis of CsPbI 3 QDs can be found in our previous work [32,33]. Direct centrifugation was used to separate the CsPbI 3 QDs from the reaction solution.…”