Controlling the formation energy of perovskite phase via surface polarity of substrate for efficient pure-blue light-emitting diodes

Shin, Yun Seop; Yoon, Yung Jin; Kweon, Seong Hyeon; Oh, Seung Hak; Park, Chan Beom; Yuk, Dohun; Song, Taehee; Son, Jung Geon; Seo, Jongdeuk; Lee, Woojin; Kwak, Sang Kyu; Kim, Gi-Hwan; Kim, Jin Young

doi:10.1016/j.cej.2023.142707

Cited by 14 publications

(3 citation statements)

References 44 publications

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“…Furthermore, compared with the control samples, the 1 and 2 mg mL −1 samples show slightly increased bandgap and decreased Urbach energies as shown in Figure S5 (Supporting Information). It is indicated that the defect density in the quasi‐2D mixed‐halide perovskite layers is effectively reduced, [ 39,42 ] which further confirms the defect passivation efficacy of the PEA 2 PbBr 4 ‐based bottom‐interface modification. As shown in Figure 2c, the control samples show a PL maximum at 497 nm, while the 1 and 2 mg mL −1 samples exhibit a blue‐shifted PL maximum at 488 nm and meanwhile the 1.3–1.7 folds increased PL intensity.…”

Section: Resultsmentioning

confidence: 68%

“…Likewise, the 1 and 2 mg mL −1 samples show PLQYs of 63% and 65%, respectively, in Figure 2g, which are much higher than those of the control samples (40%). In addition, as shown in Figure S8 (Supporting Information), the defect density in the 1 mg mL −1 samples extracted from the trap‐filled limit voltage of the hole‐dominated devices [ 39 ] is lower than that in the control samples, while the hole mobility values of the control and 1 mg mL −1 samples are similar. Therefore, attributed to the enhanced Lewis acid‐base interaction, the PEA 2 PbBr 4 ‐based bottom‐interface modification has strong defect passivation efficacy to largely reduce the defect‐induced non‐radiative losses toward efficient light emission.…”

Section: Resultsmentioning

confidence: 99%

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Defect Passivation Efficacy of 2D Perovskite Interlayer for Perovskite Sky‐Blue Emission Toward High Device Efficiency

Wang,

Peng,

Chen

et al. 2023

Adv Funct Materials

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The deviated crystallization kinetics of solution‐processed perovskite layers caused by the bottom interface is a barrier to comprehensively suppressing the defect formation and further to efficaciously improve the film quality and device performance. Herein, it is reported that the incorporation of a PEA2PbBr4 interlayer can effectively modify the crystallization process of the quasi‐2D mixed‐halide perovskite layers, resulting in enhanced Lewis acid‐base interaction and improved film homogeneity, which contributes to the strong defect passivation efficacy toward efficient sky‐blue emission. As a result, the devices with the bottom‐interface modification show a maximum external quantum efficiency of 14.2%, impressively an outstanding power efficiency of 17.0 lm W−1, and an external quantum efficiency of 12.3% at 1000 cd m−2. This work provides an insight into crystallization kinetics for defect suppression of the perovskite layer and further highlights the defect passivation efficacy of 2D perovskite‐based bottom‐interface modification toward high‐efficiency sky blue‐emitting diodes.

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Defect Passivation Efficacy of 2D Perovskite Interlayer for Perovskite Sky‐Blue Emission Toward High Device Efficiency

Wang,

Peng,

Chen

et al. 2023

Adv Funct Materials

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“…Further comparison of these calculated band positions to those of 3D CsPbBr 3 (Figure c) make it clear that, if the 3D phase exists in a mixed n phase sample, carrier funneling would heavily favor radiative recombination at 525 nm (the PL emission wavelength for 3D CsPbBr 3 ). Indeed, many reports have shown that the suppression of the 3D phase and control of the 2D phase distribution in thin films are critical for LEDs and other optoelectronic devices. ,− Conversely, when making claims about LED or even lasing from related 2D RP perovskites, caution must be taken to rule out light emission from 3D perovskite rigorously.…”

mentioning

confidence: 99%

High Layer Number (n = 1–6) 2D Ruddlesden–Popper Lead Bromide Perovskites: Nanosheets, Crystal Structure, and Optoelectronic Properties

Forlano,

Roy,

Mihalyi-Koch

et al. 2023

ACS Materials Lett.

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2D Ruddlesden−Popper (RP) lead halide perovskites have highly tunable structures, compositions, and properties that enable their promising optoelectronic applications. Among various 2D halide perovskites, the materials chemistry and fundamental optoelectronic properties of high layer number (n) lead-bromide RP perovskites, where n refers to the number of inorganic octahedra layers, have been less studied. Here, we report the synthesis of thin nanosheets of (PEA) 2 Cs n−1 Pb n Br 3n+1 (n = 1−6, PEA = phenylethylammonium) perovskites and study the optical properties, assigning photoluminescence emissions of 486, 496, and 505 nm to n = 4−6 phases, respectively, and reporting the photoluminescence lifetimes. The crystal structure of (PEA) 2 Cs 2 Pb 3 Br 10 was determined to reveal minimal octahedral structural distortions. Ultraviolet photoelectron spectroscopy measurements reveal the positioning of the valence and conduction bands for n = 1−3 phases and confirm the type-I band alignment for the (PEA) 2 Cs n−1 Pb n Br 3n+1 series, laying the foundation for rational heterostructure device design in the future.

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Reduced‐Dimensional Perovskites: Quantum Well Thickness Distribution and Optoelectronic Properties

Cheng,

Wan,

Sargent

et al. 2024

Advanced Materials

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Reduced‐dimensional perovskites (RDPs), a large category of metal halide perovskites, have attracted considerable attention and shown high potential in the fields of solid‐state displays and lighting. RDPs feature a quantum‐well‐based structure and energy funneling effects. The multiple quantum well (QW) structure endows RDPs with superior energy transfer and high luminescence efficiency. The effect of QW confinement directly depends on the number of inorganic octahedral layers (QW thickness, i.e., n value), so the distribution of n values determines the optoelectronic properties of RDPs. Here, it is focused on the QW thickness distribution of RDPs, detailing its effect on the structural characteristics, carrier recombination dynamics, optoelectronic properties, and applications in light‐emitting diodes. The reported distribution control strategies is also summarized and discuss the current challenges and future trends of RDPs. This review aims to provide deep insight into RDPs, with the hope of advancing their further development and applications.

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Controlling the formation energy of perovskite phase via surface polarity of substrate for efficient pure-blue light-emitting diodes

Cited by 14 publications

References 44 publications

Defect Passivation Efficacy of 2D Perovskite Interlayer for Perovskite Sky‐Blue Emission Toward High Device Efficiency

Defect Passivation Efficacy of 2D Perovskite Interlayer for Perovskite Sky‐Blue Emission Toward High Device Efficiency

High Layer Number (n = 1–6) 2D Ruddlesden–Popper Lead Bromide Perovskites: Nanosheets, Crystal Structure, and Optoelectronic Properties

Reduced‐Dimensional Perovskites: Quantum Well Thickness Distribution and Optoelectronic Properties

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