Enhanced Optical Properties and Stability of CsPbBr<sub>3</sub> Nanocrystals Through Nickel Doping

Kim, Hayeong; Bae, Sa Rang; Lee, Tae Hyung; Lee, Hyoseong; Kang, Heemin; Park, Sungnam; Jang, Ho Won; Kim, Soo Young

doi:10.1002/adfm.202102770

Cited by 74 publications

(48 citation statements)

References 41 publications

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“…The Pb 2+ can be substituted Ni 2+ easily in perovskites because of the cationic radius (72 pm) than that of Pb 2+ (119 pm). 32 Moreover, Ni 2+ has 3d orbital, and the material electrical properties can be tuned through Ni 2+ substitution. The latest tolerance factor (τ) and the octahedral factor (μ) are defined as the following formulas 33…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…It is highly desired to explore lead-free or lead-less PSCs without sacrificing efficiency. − As in the same IVA group, Sn has been regarded as the idea substitution. − However, the Sn-based PSCs have obtained PCE only 13.4%, and the oxidation state of Sn +2 is less stable than the +4 state due to the high energy level in the 5s orbit. , Because lead-free PSCs are not efficient, partial substitution for Pb has become a compromise proposal to simultaneously improve the stability and efficiency of PSCs with reducing toxicity . Monovalent metal cation (Na + , K + , Ag + ) had been doped in perovskites to optimize film morphology and enhance performance of PSCs. , Moreover, trivalent metal cations have been used in PSCs to passivate perovskite defects in a cyclical transition to enhance PSCs. , Divalent transition metal cations (Zn 2+ , Co 2+ , Mn 2+ ) can partially substitute Pb 2+ with high content, broaden spectral response, and tune electronic structures of perovskite films. − As a member of transition metals, Ni 2+ can form stable octahedral structures with halide ions and reduce the structural defect density. , Besides, Ni 2+ has been doped in CsPbBr 3 perovskites, which greatly improve the stability. , Therefore, it is necessary to deeply investigate the effect of the substitution of Ni 2+ on the efficiency and stability of organic–inorganic hybrid PSCs.…”

Section: Introductionmentioning

confidence: 99%

“…29,30 Besides, Ni 2+ has been doped in CsPbBr 3 perovskites, which greatly improve the stability. 31,32 Therefore, it is necessary to deeply investigate the effect of the substitution of Ni 2+ on the efficiency and stability of organic−inorganic hybrid PSCs.…”

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stable and Efficient Pb–Ni Binary Metal Perovskite Solar Cells

Liu

Feng

et al. 2021

ACS Sustainable Chem. Eng.

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Despite becoming a potential photovoltaic technology, perovskite solar cells (PSCs) are still subject to the instability and lead toxicity. Partial substitution in lead sites has been proven as a valid strategy to enhance perovskite film quality and stability toward lowtoxicity and high-performance PSCs. Here, Pb was partially substituted Ni for MAPb 1−x Ni x I 3 (x = 0−0.5) films to improve the stability and reduce the toxicity in PSCs. The little Ni substitution induced high quality of perovskite films with large grains to reduce the trap-state density and improve the carrier lifetime in PSCs. The average power conversion efficiency (PCE) of the PSCs increased to 18.52% from 17.64%, and the maximum value achieved was 20.63%. Moreover, the Ni 2+ -doped perovskite films can remain crystalline with excellent stability after 1 year in the humid air (20−30% humidity), so that the PSCs can retain 86% of initial PCE after 500 h with long-term stability. With more substituted amount of 10% Ni, the PCE of PSCs can still be maintained at 14.04%. This work suggests that the balance between long stability and less toxicity by Ni substitution can be a valid approach for efficient and stable PSCs.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stable and Efficient Pb–Ni Binary Metal Perovskite Solar Cells

Liu

Feng

et al. 2021

ACS Sustainable Chem. Eng.

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“…Although sometimes defects are deliberately introduced to adjust the structure and properties of the material, 156,157 it is generally believed that higher-dimensional defects and deeplevel traps will adversely affect the performance of the corresponding device. 21,144 Defects in perovskite materials have obvious effects on charge mobility, carrier recombination, PLQY, and many other aspects.…”

Section: Negative Effectsmentioning

confidence: 99%

“…Although sometimes defects are deliberately introduced to adjust the structure and properties of the material, , it is generally believed that higher-dimensional defects and deep-level traps will adversely affect the performance of the corresponding device. , Defects in perovskite materials have obvious effects on charge mobility, carrier recombination, PLQY, and many other aspects. , If the free carriers are captured by a defect site, there are usually two situations. The trapped carriers may escape to the CB or VB edges by absorbing light or heat, or may be temporarily trapped in the defect state. , The crystal defects and corresponding transition levels determine the carrier dynamics in optoelectronic devices, which are critical to the efficiency and operating stability of PeLEDs.…”

Section: Negative Effectsmentioning

confidence: 99%

Defect Behaviors in Perovskite Light-Emitting Diodes

Shan

et al. 2021

ACS Materials Lett.

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Defects play a pivotal role in the physical and chemical properties of semiconductor materials. Regulation of the type, distribution, and quantity of defects within the crystal allows for refinement of material properties, which, in turn, affects the performance of semiconductor devices. Looking back at the development in the realm of perovskite, the research on defect behaviors has always been closely linked to the outstanding improvements in solar cells, light-emitting diodes (LEDs), and other devices. Recently, the external quantum efficiencies (EQEs) of red, green, and blue perovskite LEDs have approached the efficiency limit after comprehensive defect suppression strategies. The research emphasis on perovskite LEDs has gradually shifted from efficiency improvement to stability improvement, as well as defect formation and passivation mechanisms. However, existing views on the origin and action of defects are contradictory. In this Review, we focus on the origins and negative effects of defects from the perspective of LEDs performance; we also summarize the defect passivation strategies developed in recent studies. Given the universality of defects, a cogent summary of defect behaviors may help to further improve the performance of perovskite LEDs and promote the development of other optoelectronic devices.

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Learning‐Effective Mixed‐Dimensional Halide Perovskite QD Synaptic Array for Self‐Rectifying and Luminous Artificial Neural Networks

Park,

Wang

2023

Adv Funct Materials

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A mixed‐dimensional heterostructure comprising nanomaterials with varying dimensions provides a promising structure for an artificial synapse for reconfigurable neuromorphic functions. In this study, an 8 × 8 memristor crossbar array based on a mixed‐dimensional heterostructure comprising Cs1−xFAxPbBr3 (0.00 ≤ x ≤ 0.15) quantum dots (QDs) and different dimensional interfacial nanomaterial layers between the Al and ITO electrodes is designed and fabricated. This array device exhibits a high yield and reliable self‐rectifying analog switching characteristics with low synaptic‐coupling (SC, up to 5.19 × 10−5) and light emission, facilitating stimuli response visualization and preventing undesired pathways in the network array. Furthermore, because the formamidinium (FA) concentration alters the QD size, thereby engineering interfacial band alignment in the heterostructure, the essential synaptic properties such as dynamic range, SC, and nonlinearity can be improved. Especially, as x increases from 0 to 0.11, the recognition accuracy for the MNIST patterns increases significantly, from 68.97% to 89.08%, even for single‐layer ANNs. The energy consumption required for a specific accuracy level is reduced by a factor of 25.15. The utilization of mixed‐dimensional perovskite QD‐based heterostructures in neural networks may provide desirable neuromorphic electronic functions with enhanced learning capability and energy efficiency, while preventing unwanted neural signals.

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Enhanced Optical Properties and Stability of CsPbBr₃ Nanocrystals Through Nickel Doping

Cited by 74 publications

References 41 publications

Stable and Efficient Pb–Ni Binary Metal Perovskite Solar Cells

Stable and Efficient Pb–Ni Binary Metal Perovskite Solar Cells

Defect Behaviors in Perovskite Light-Emitting Diodes

Learning‐Effective Mixed‐Dimensional Halide Perovskite QD Synaptic Array for Self‐Rectifying and Luminous Artificial Neural Networks

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Enhanced Optical Properties and Stability of CsPbBr3 Nanocrystals Through Nickel Doping

Cited by 74 publications

References 41 publications

Stable and Efficient Pb–Ni Binary Metal Perovskite Solar Cells

Stable and Efficient Pb–Ni Binary Metal Perovskite Solar Cells

Defect Behaviors in Perovskite Light-Emitting Diodes

Learning‐Effective Mixed‐Dimensional Halide Perovskite QD Synaptic Array for Self‐Rectifying and Luminous Artificial Neural Networks

Contact Info

Product

Resources

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Enhanced Optical Properties and Stability of CsPbBr₃ Nanocrystals Through Nickel Doping