2020/08/12 by Masoud Alahbakhshi, Alahbakhshi, Masoud, Alexios Papadimitratos +14
Engineering · Psychology · #Applied Physics (physics.app-ph) #FOS: Physical sciences #Optics (physics.optics) #Organic Light-Emitting Diodes Research #Perovskite Materials and Applications #Technostress in Professional Settings
paper · pdf · doi:10.48550/arxiv.2008.05518
openalex publication_date 2020/08/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Organic-inorganic perovskite light-emitting devices have recently emerged as\na reliable light source. Here, we developed a Single Layer Perovskite\nLight-Emitting Electrochemical Cells (SL-PeLEC) with laminated free-standing\nCarbon Nanotube Sheet (CNT) sheets as an effective charge electron injecting\ncathode electrode. The structure consists of bottom ITO-on-glass as a\ntransparent electrode, the composite of CsPbBr3:PEO:LiPF6 with additive ionic\nsalt as an emitting layer (EML) and 5 layers of CNT aerogel sheets as a top\nlaminated cathode . Utilizing CNT free standing sheets laminated right on top\nof perovskite thin film in this simple single layer configuration has multiple\nbenefits. Such CNT top cathode does not show any chemical degradation by\nreaction with halogens from perovskite, which is detrimental for metallic\ncathodes. Moreover, the formation of an internal p-i-n junction in perovskite\nEML composite layer by ionic migration under applied voltage bias and electric\ndouble layer (EDL) formation at each electrode interface is beneficially\neffecting CNT sheets by Li+ ionic doping and raises their Fermi level, further\nenhancing electron injection. Besides, inspired by successes of ionic additives\nin LECs and electrochemical doping of perovskite with alkali metals, we\nleveraged a lithium salt, LiPF6, within a CsPbBr3:PEO composite matrix to\nachieve optimal ionic redistribution and doping effects in this SL-PeLEC.\nAlthough initially CNT electrode has slightly high sheet resistance, the\nSL-PeLEC device has a low turn-on voltage of 2.6v and a maximum luminance\nintensity of 530 cd/m2, confirming the n-doping increased conductivity. This\nwork provides a unique route toward flexible and bright perovskite LECs with\nstable and transparent CNT electrodes that can have injection efficiency tuned\nby poling induced ionic EDL-doping\n