| Annealing-free Synthesis of Ultra-fine Zinc Oxide Nanoparticles for Perovskite LED |
| Paper ID : 1680-UFGNSM-FULL |
| Authors: |
|
masoud payandeh1, Vahid Ahmadi *2, pariya nazari3, Fatemeh Anasari4, bahram Abdollahi Nejand5, farzaneh Arabpour6 11415933469 2Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran 3Dept of Physics, Tarbiat Modares University, Tehran-Iran 4Dept of Chemistry, Kashan University, KashaN-Iran. 5School of Electrical and Computer Engineering, Tarbiat Modares University, Tehran-Iran Nanomaterial Research Group, Academic Center for Education, Culture, and Research (ACECR) on TMU, Tehran-Iran. 6School of Electrical and Computer Engineering, Tarbiat Modares University, Tehran-Iran. |
| Abstract: |
| In this work, we introduce a novel approach in synthesizing an ultra-fine ZnO nanocrystals for application in light emitting diodes. Engineered ZnO nanocrystal precipitation from an alcoholic solution followed by well post-treatment and dispersing in the 2-propanol solvent, results in an ultra-fine ZnO nanocrystals with almost 5 nm in diameter. The as-synthesized and deposited thin films by ZnO nanocrystals shows a nanocrystalline and uniform thin films with 40 nm thickness containing no pinholes. The produced pinehole-free thin film is an ideal thin film for optoelectronic devices. The FE-SEM, TEM, and XRD analysis are conducted to study the particle size and crystallization of ZnO nanopartilces. Perovskite-based LEDs (PeLED) are serious competitors for conventional LEDs because of their low cost material while have interesting optical and electrical features such as tunable band gap, high charge-carrier mobility, low trap density, and high color purity. Using appropriate electron transport layer (ETL) and hole transport layer (HTL) proposes an appropriate approach to improve the performance of PeLEDs. Herein, we report the application of nanocrystalline ZnO particles as an ETL in fabrication of reproducible and high-brightness green PeLED. To achieve a high radiance and a high efficiency, the PeLED structure must provide confinement of charge carriers for stimulated emission in active area. So, we construct a multilayer p-i-n PeLED with an ITO/PEDOT:PSS/CH3NH3PbBr3/ZnO/Ag structure by spin coating method. By this structure we achieved a luminance of 3520 cd m-2 and a maximum current efficiency of 0.57 cd A-1. The green PeLED start to light up at 2.7 V, with FWHM about 30 nm. |
| Keywords: |
| perovskite LEDs, ZnO nanoparticle, ETL, HTL |
| Status : Paper Accepted (Oral Presentation) |
