Suppressing defect states in CsPbBr<sub>3</sub> perovskite <i>via</i> magnesium substitution for efficient all-inorganic light-emitting diodes

Huang, Qi; Zou, Yatao; Bourelle, Sean A.; Zhai, Tianyu; Tian, Wenjing; Tan, Yeshu; Li, Yajuan; Li, Junnan; Duhm, Steffen; Song, Tao; Wang, Lu; Deschler, Felix

doi:10.1039/c9nh00066f

Cited by 37 publications

(39 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Metal halide perovskites with common formula ABX 3 , where A is monovalent cation (methylammonium (MA), formamidinium (FA), or inorganic alkali metal cesium (Cs)), B is divalent cation (e.g., lead), and X is a halide anion (i.e., Cl, Br, and I), [ 1 − 4 ] have offered the immense potential as both light‐emitting and light‐absorbing direct‐band solution‐processed semiconductors. Organic−inorganic perovskites have been widely investigated in past few years, and have been extensively studied in the field of solar cells, light‐emitting diodes, and photodetectors [ 2,5,6 ] for their superior photoelectric properties.…”

Section: Introductionmentioning

confidence: 99%

Surface Engineering of All‐Inorganic Perovskite Quantum Dots with Quasi Core−Shell Technique for High‐Performance Photodetectors

Saleem

Yang

Zhi

et al. 2020

Adv Materials Inter

View full text Add to dashboard Cite

All‐inorganic lead halide perovskites with good surface morphology show substantial prospect for optoelectronic devices. However, the anion exchange of coordinated alkylamine ligands (e.g., oleic acid and oleylamine) can detach ligands and induce more interface trap sites, subsequently to reduce device performance. In this paper, therefore, a simple solution‐processed route is presented to synthesize quasi coreshell CsPbBr3formamidinium iodide (FAI = CH(NH2)2I) colloidal quantum dots (CQDs), and then it is applied as the active layer for photodetectors by finely controlling the ligands exchange. The presence of FAI = CH(NH2)2I on CsPbBr3 is confirmed by Fourier transform infrared spectroscopy. As a result, the photodetector ITO/ZnO (100 nm)/CsPbBr3 (150 nm)/Au show an enhanced specific detectivity over 1013 Jones with a responsivity of 19 A W1 under 3 mW cm2 405 nm illumination at 1.5 V. The experimental data show that the enhanced device performance is due to the improved crystallinity and less surface defects of CsPbBr3 CQDs, as the result of less alkylamine ligands is detached during its FAI passivation, thus the charge carriers' mobility of the film is improved. Therefore, it provides a promising way for high‐performance solution‐processed all‐inorganic CsPbBr3 based optoelectronic devices.

show abstract

Section: Introductionmentioning

confidence: 99%

Surface Engineering of All‐Inorganic Perovskite Quantum Dots with Quasi Core−Shell Technique for High‐Performance Photodetectors

Saleem

Yang

Zhi

et al. 2020

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

“…All these properties of lead halide perovskites are superior to typical Cd‐based quantum dots (QDs). Because of these superior properties, tri‐halide lead perovskites have been widely investigated and employed in modern optoelectronic devices including solar cells, LEDs, and photodetectors . Although, all‐inorganic lead halide perovskite (CsPbX 3 ) NC‐based optoelectronic devices exhibit higher stability compared to their organic–inorganic hybrid counterparts.…”

Section: Introductionmentioning

confidence: 99%

Mg²⁺‐Alloyed All‐Inorganic Halide Perovskites for White Light‐Emitting Diodes by 3D‐Printing Method

Adhikari

Thapa

Zhu

et al. 2019

Advanced Optical Materials

View full text Add to dashboard Cite

All‐inorganic halide perovskites (CsPbX3, X = Cl−, Br−, and I−) are brought to the forefront of research focus in the field of modern lighting technology. However, due to the toxic element (Pb2+), environmentally friendly white‐light emissions are difficult to achieve, thus limiting their practical applications. Herein, high‐quality Mg2+‐alloyed CsPb1−x Mgx X3 (up to 20%) nanocrystals (NCs) are synthesized. The structural and optical properties are investigated. The application of these NCs in white‐light‐emitting diodes (LEDs) is also demonstrated. The incorporation of Mg2+ into CsPb1−x Mgx X3 NCs results in a lattice contraction without a change in structure and morphology, blue‐shifts in the photoluminescence emission, and increased bandgap. Then, the tunable emission (≈408–650 nm) is obtained by adjusting the compositions of different halides (for 20% Mg2+). Most importantly, for the first time, 3D printed thin color conversion layers for different color emitting NCs (green, yellow, and red) are stacked on top of the blue‐LEDs to achieve high‐quality white light emission. A bright neutral white‐light with a correlated‐color temperature of 5806 K, a high color‐rendering index of 89, CIE coordinates of (0.32, 0.33), a small Duv (<0.003), and high luminous efficacy of radiation of 280 lm W−1 is achieved.

show abstract

“…Since Kojima et al first reported organic–inorganic perovskite materials as visible‐light sensitizers in 2009,1 the power conversion efficiencies (PCEs) of hybrid perovskite solar cells (PSCs) have remarkably increased from the initial 3.8% to 25.2%2 in 2019. This demonstrates the potential of PSCs as an alternative to commercial silicon‐based solar cells for applications in the field of photovoltaics 3–7…”

Section: Introductionmentioning

confidence: 82%

Solvent Engineering Using a Volatile Solid for Highly Efficient and Stable Perovskite Solar Cells

Cui

et al. 2020

Advanced Science

View full text Add to dashboard Cite

A strategy for efficaciously regulating perovskite crystallinity is proposed by using a volatile solid glycolic acid (HOCH2COOH, GA) in an FA0.85MA0.15PbI3 (FA: HC(NH2)2; MA: CH3NH3) perovskite precursor solution that is different from the common additive approach. Accompanied with the first dimethyl sulfoxide sublimation process, the subsequent sublimation of GA before 150 °C in the FA0.85MA0.15PbI3 perovskite film can artfully regulate the perovskite crystallinity without any residual after annealing. The improved film formation upon GA modification induced by the strong interaction between GA and Pb2+ delivers a champion power conversion efficiency (PCE) as high as 21.32%. In order to investigate the role of volatility in perovskite solar cells (PSCs), nonvolatile thioglycolic acid (HSCH2COOH, TGA) with a similar structure to GA is utilized as an additive reference. Large perovskite grains are obtained by TGA modification but with obvious pinholes, which directly leads to an increased defect density accompanied by a decline in PCE. Encouragingly, the champion PCE achieved for GA‐based PSC device (21.32%) is almost 13% or 20% higher than those of the control device or TGA‐based device. In addition, GA‐modified PSCs exhibit the best stability in light‐, thermal‐, and humidity‐based tests due to the improved film formation.

show abstract

Suppressing defect states in CsPbBr₃ perovskite via magnesium substitution for efficient all-inorganic light-emitting diodes

Abstract: Non-radiative recombination in all-inorganic CsPbBr3 perovskite films was dramatically reduced upon partial replacement of lead ions with magnesium, leading to efficient and stable perovskite light-emitting diodes.

Cited by 37 publications

References 45 publications

Surface Engineering of All‐Inorganic Perovskite Quantum Dots with Quasi Core−Shell Technique for High‐Performance Photodetectors

Surface Engineering of All‐Inorganic Perovskite Quantum Dots with Quasi Core−Shell Technique for High‐Performance Photodetectors

Mg²⁺‐Alloyed All‐Inorganic Halide Perovskites for White Light‐Emitting Diodes by 3D‐Printing Method

Solvent Engineering Using a Volatile Solid for Highly Efficient and Stable Perovskite Solar Cells

Contact Info

Product

Resources

About

Suppressing defect states in CsPbBr3 perovskite via magnesium substitution for efficient all-inorganic light-emitting diodes

Abstract: Non-radiative recombination in all-inorganic CsPbBr3 perovskite films was dramatically reduced upon partial replacement of lead ions with magnesium, leading to efficient and stable perovskite light-emitting diodes.

Cited by 37 publications

References 45 publications

Surface Engineering of All‐Inorganic Perovskite Quantum Dots with Quasi Core−Shell Technique for High‐Performance Photodetectors

Surface Engineering of All‐Inorganic Perovskite Quantum Dots with Quasi Core−Shell Technique for High‐Performance Photodetectors

Mg2+‐Alloyed All‐Inorganic Halide Perovskites for White Light‐Emitting Diodes by 3D‐Printing Method

Solvent Engineering Using a Volatile Solid for Highly Efficient and Stable Perovskite Solar Cells

Contact Info

Product

Resources

About

Suppressing defect states in CsPbBr₃ perovskite via magnesium substitution for efficient all-inorganic light-emitting diodes

Mg²⁺‐Alloyed All‐Inorganic Halide Perovskites for White Light‐Emitting Diodes by 3D‐Printing Method