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doi:10.1002/adma.v27.12

Cited by 19 publications

(9 citation statements)

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“…New metal halide perovskite films were fabricated by a single step method utilizing a molar ratio of 1.05 between PbI 2 /formamidinium Iodine, providing efficiency of 20.8%. 44 These films are used in lightemitting diodes, 45,46 solution-processed photodetectors, [47][48][49] and lasers. 50 Transition metal oxide perovskites, such as LaVO 3 (mott insulators) displays an indirect band gap of 1.08 eV.…”

Section: Introductionmentioning

confidence: 99%

Factors affecting the stability of perovskite solar cells: a comprehensive review

2019

J. Photon. Energy

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Accelerated depletion of fossil fuel, energy demands, and pollution force us to choose renewable and eco-friendly energy resources. Solar cells are considered as an efficient replacement for fossil fuel. In the family of solar cells, silicon-based solar cells and perovskite solar cells (PSC) have displayed significant power conversion efficiency (PCE). Perovskites have been investigated extensively over the past two decades, due to their advantageous properties, such as high absorption coefficient, efficient carrier mobility, long charge diffusion length, and direct bandgap. These features make PSC a prospective candidate to replace silicon in solar cells. By 2018, PSC achieved an encouraging PCE of 23.3%. However, low stability and toxicity have retarded the commercialization of PSC. With the aim of assisting junior researchers, we consider the latest achievements in this domain and review the field from a stability and performance perspective. We emphasize recent developments and methodologies to overcome drawbacks concerning stability and toxicity.

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Section: Introductionmentioning

confidence: 99%

Factors affecting the stability of perovskite solar cells: a comprehensive review

2019

J. Photon. Energy

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“…With the progresses made in multiband or broadband communication technology, broadband absorption is highly desired. Many wideband absorbers with special structures are reported, including porous, [13] multilayer, [14] and pyramidal structures. [15] Unfortunately, these wideband absorbers were achieved at the sacrifice of the thickness.…”

Section: Introductionmentioning

confidence: 99%

Modeling for multi-resonant behavior of broadband metamaterial absorber with geometrical substrate

Zhang¹,

Hou²,

Bi³

et al. 2017

Chinese Phys. B

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Despite widespread use for extending absorption bandwidth, the coexistence and coupling mechanism of multiple resonance is not well understood. We propose two models to describe the multi-resonant behavior of a broadband metamaterial absorber with geometrical-array substrate (GAS). The multi-resonance coupling of GAS is well described by logarithmic law. The interaction between metasurface and GAS can further broaden the absorption bandwidth by generating a new resonance which coexists with original resonances in substrate. The proposed models can thoroughly describe this multiple-resonance behavior, highlighting guidelines for designing broadband absorbers.

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“…To obtain highly efficient WOLEDs, a key requirement is that all electrically generated excitons, i.e., both singlet and triplet excitons, must be employed for radiative decay. [7,8] During the past few decades, various approaches to fully harness excitons have been raised. Phosphorescent WOLEDs have shown very high efficiencies, owing to the theoretical 100% internal quantum efficiency of the phosphorescent emitters.…”

Section: Introductionmentioning

confidence: 99%

“…[15,16] Blue TADF fluorophores can allow both electro-generated singlet and triplet excitons light emission through thermal upconversion of the lowest T 1 to singlet state (S 1 ) since the energy gap between S 1 and T 1 (∆E ST ) is sufficiently small, which leads to the potential for achieving 100% internal emission efficiency. [17][18][19] Moreover, the recycling of triplet excitons can realize an adequate blue fluorescent emission, which can match better with yellow or red/green emission to obtain high performance hybrid WOLEDs. Therefore, hybrid WOLEDs using blue TADF fluorophores can further simplify the structure and reduce the triplet loss, which is superior to these using conventional blue fluorophores with high T 1 .…”

Section: Introductionmentioning

confidence: 99%

“…The hybrid WOLEDs based on non-doped EMLs with high efficiency have been designed by employing a blue TADF emitter and a yellow phosphorescence emitter. The blue TADF emitter consisting of a kind of blue TADF fluorophores 9,9-dimethyl-9,10dihydroacridine-diphenylsulfone (DMAC-DPS) that is insensitive to the doping ratio and exhibits high quantum efficiency has been reported, [27,28] and hybrid WOLEDs using DMAC-DPS as blue fluorophores have already exhibited high performance. [29,30] So, pure DMAC-DPS can be used as blue EML for non-doped hybrid WOLED, which affords an effective way to realize high performance, and has merits of simplified fabrication process, repeatability improvement, and cost reduction.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Förster energy transfer from thermally activated delayed fluorophores layer to ultrathin phosphor layer for high color stability in non-doped hybrid white organic light-emitting devices

Wang¹,

Zhao²,

Chang³

et al. 2017

Chinese Phys. B

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Fluorescence/phosphorescence hybrid white organic light-emitting devices (WOLEDs) based on double emitting layers (EMLs) with high color stability are fabricated. The simplified EMLs consist of a non-doped blue thermally activated delayed fluorescence (TADF) layer using 9,9-dimethyl-9,10-dihydroacridine-diphenylsulfone (DMAC-DPS) and an ultrathin non-doped yellow phosphorescence layer employing bis[2-(4-tertbutylphenyl)benzothiazolato-N,C2'] iridium (acetylacetonate) ((tbt) 2 Ir(acac)). Two kinds of materials of 4,7-diphenyl-1,10-phenanthroline (Bphen) and 1,3,5-tris(2-Nphenylbenzimidazolyl) benzene (TPBi) are selected as the electron transporting layer (ETL), and the thickness of yellow EML is adjusted to optimize device performance. The device based on a 0.3-nm-thick yellow EML and Bphen exhibits high color stability with a slight Commission International de l'Eclairage (CIE) coordinates variation of (0.017, 0.009) at a luminance ranging from 52 cd/m 2 to 6998 cd/m 2 . The TPBi-based device yields a high efficiency with a maximum external quantum efficiency (EQE), current efficiency, and power efficiency of 10%, 21.1 cd/A, and 21.3 lm/W, respectively. The ultrathin yellow EML suppresses hole trapping and short-radius Dexter energy transfer, so that Förster energy transfer (FRET) from DMAC-DPS to (tbt) 2 Ir(acac) is dominant, which is beneficial to keep the color stable. The employment of TPBi with higher triplet excited state effectively alleviates the triplet exciton quenching by ETL to improve device efficiency.

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Cited by 19 publications

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Factors affecting the stability of perovskite solar cells: a comprehensive review

Factors affecting the stability of perovskite solar cells: a comprehensive review

Modeling for multi-resonant behavior of broadband metamaterial absorber with geometrical substrate

Enhancement of Förster energy transfer from thermally activated delayed fluorophores layer to ultrathin phosphor layer for high color stability in non-doped hybrid white organic light-emitting devices

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