Abstract
This paper presents the results of pressure-effects on performance characteristics of near-infra-red perovskite light emitting diodes (PeLEDs) using a combination of experimental and analytical/computational approaches. First, pressure-effects are studied using models that consider the deformation and contacts that occur around interfacial impurities and interlayer surface roughness in PeLEDs. The predictions from the model show that the sizes of the interfacial defects decrease with increasing applied pressure. The current–voltage characteristics of the fabricated devices are also presented. These show that the PeLEDs have reduced turn-on voltages (from 2.5 V to 1.5 V) with the application of pressure. The associated pressure-induced reductions in the defect density and the bandgaps of the perovskite layer are then used to explain the improved performance characteristics of the PeLED devices.
Highlights
Organic–inorganic lead halide-based perovskite electronic materials have attracted significant attention in the recent years.1–5 This is due to the attractive optical and electrical performance of perovskite solar cells and perovskite light emitting diodes (PeLEDs).3–8Perovskite materials are attractive because they can be solution processed5–7 without any high temperature heating.5,8–10 They possess tunable optical bandgaps in the visible regime, which makes them promising materials for optoelectronic applications.5,11Several efforts have been made to improve the efficiency of the hybrid perovskite-based electronic systems.12–14 These include scitation.org/journal/adv film morphology,15,16 interface engineering,12,13 and modifications on methods of fabrication.3,12,14 Starting with the liquid electrolyte configurations of the organic–inorganic halides CH3NH3PbI3, the efficiency of 3.8% was presented for solar cells by Kojima et al.17 This was later improved by Im et al.18 to 6.5%
This paper presents the results of pressure-effects on performance characteristics of near-infra-red perovskite light emitting diodes (PeLEDs) using a combination of experimental and analytical/computational approaches
The etched Indium tin oxide (ITO)-coated glass substrates were sequentially cleaned by sonification with Decon 90, deionized water (DI) water, acetone, and isopropyl alcohol (IPA) before blow-drying with nitrogen gas
Summary
Organic–inorganic lead halide-based perovskite electronic materials have attracted significant attention in the recent years. This is due to the attractive optical and electrical performance of perovskite solar cells and perovskite light emitting diodes (PeLEDs).3–8Perovskite materials are attractive because they can be solution processed without any high temperature heating. They possess tunable optical bandgaps in the visible regime, which makes them promising materials for optoelectronic applications.5,11Several efforts have been made to improve the efficiency of the hybrid perovskite-based electronic systems. These include scitation.org/journal/adv film morphology, interface engineering, and modifications on methods of fabrication. Starting with the liquid electrolyte configurations of the organic–inorganic halides CH3NH3PbI3, the efficiency of 3.8% was presented for solar cells by Kojima et al. This was later improved by Im et al. to 6.5%. Organic–inorganic lead halide-based perovskite electronic materials have attracted significant attention in the recent years.. Perovskite materials are attractive because they can be solution processed without any high temperature heating.. Perovskite materials are attractive because they can be solution processed without any high temperature heating.5,8–10 They possess tunable optical bandgaps in the visible regime, which makes them promising materials for optoelectronic applications.. Starting with the liquid electrolyte configurations of the organic–inorganic halides CH3NH3PbI3, the efficiency of 3.8% was presented for solar cells by Kojima et al.. Starting with the liquid electrolyte configurations of the organic–inorganic halides CH3NH3PbI3, the efficiency of 3.8% was presented for solar cells by Kojima et al.17 This was later improved by Im et al. to 6.5%. Further improvements on the stability and modification of architecture have facilitated rapid growth in the efficiency of perovskite solar cells, which has risen from the 3.8% to above 25%, within a decade of intensive research.
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