Highly Efficient Spectrally Stable Red Perovskite Light‐Emitting Diodes

Tian, Yu; Zhou, Chenkun; Worku, Michael; Wang, Xi; Ling, Yichuan; Gao, Hanwei; Zhou, Yan; Yu, Miao; Guan, Jingjiao; Ma, Biwu

doi:10.1002/adma.201707093

Cited by 203 publications

(189 citation statements)

References 49 publications

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“…Both devices were driven under a constant current density of 10 mA cm −2 . Tian et al has reported one of the most stable red quasi-2D perovskite LED with the EL intensity remained almost unchanged for 4 h due to a decrease in ion migration from the quasi-2D structure [112].…”

Section: Quasi-2d Perovskitementioning

confidence: 99%

“…Therefore, the defects such as undercoordinated Pb at the surface can be passivated by Lewis bases [114]. In the literature, Lewis bases such as amine (-NH 2 ) [81], hydroxyl (-OH) [47,112,115], carboxyl (-COOH) [29] and phosphine oxide (P=O) [21,47] derivatives are widely used as passivation agents for perovskites. More recently, except for the essential passivating functional groups, it was found that the hydrogen-bonding ability between the passivation agents and the organic cations in perovskites also played an important role on the effectiveness of passivation.…”

Section: Suppressing Grain Boundary Ion Migrationmentioning

confidence: 99%

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Operational stability of perovskite light emitting diodes

et al. 2020

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Organometal halide perovskite light emitting diodes (LEDs) have attracted a lot of attention in recent years, owing to the rapid progress in device efficiency. However, their short operational lifetime severely impedes the practical uses of these devices. The operating stability of perovskite LEDs are due to degradation due to ambient environment and degradation during operation. The former can be suppressed by encapsulation while the latter one is the intrinsic degradation due to the electrochemical stability of the perovskite materials. In addition, perovskites also suffer from ion migration which is a major degradation mechanism in perovskite LEDs. In this review, we specifically focus on the operational stability of perovskite LEDs. The review is divided into two parts: the first part contains a summary of various degradation mechanisms and some insight on the degradation behavior and the second part is the strategies how to improve the operational stability, especially the strategies to suppress ion migration. Based on the current advances in the literature, we finally present our perspectives to improve the device stability.

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Section: Quasi-2d Perovskitementioning

confidence: 99%

Section: Suppressing Grain Boundary Ion Migrationmentioning

confidence: 99%

Operational stability of perovskite light emitting diodes

et al. 2020

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“…Lowering the dimensionality to 2D with corner‐sharing octahedral layers and bulky organic cations separating perovskite layers gives rise to increased structural diversity and new functionalities . Besides, 2D hybrid perovskites have attracted much attention as alternative photovoltaic materials because of an improved stability arising from hydrophobic interactions, which block moisture diffusion in the material . In 2D perovskites, there is no Goldschmidt's tolerance factor restriction .…”

Section: Figurementioning

confidence: 99%

“…[9][10][11] Besides,2 Dh ybrid perovskites have attracted much attention as alternative photovoltaic materials because of an improved stability arising from hydrophobic interactions,w hich block moisture diffusion in the material. [12][13][14] In 2D perovskites,t here is no Goldschmidtstolerance factor restriction. [15] As aresult, the optical and electronic properties of the materials can be tuned not only by metal cation and halide anion but also organic molecules with different sizes and functional groups,p roviding almost unlimited compositional and structural versatility.…”

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confidence: 99%

Reversible Thermochromism and Strong Ferromagnetism in Two‐Dimensional Hybrid Perovskites

Sun

Liu

et al. 2019

Angewandte Chemie

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Two‐dimensional (2D) hybrid perovskites have shown many attractive properties associated with their soft lattices and multiple quantum well structure. Herein, we report the synthesis and characterization of two new multifunctional 2D hybrid perovskites, (PED)CuCl4 and (BED)2CuCl6, which show reversible thermochromic behavior, dramatic temperature‐dependent conductivity change, and strong ferromagnetism. Upon temperature change, the (PED)CuCl4 and (BED)2CuCl6 crystals exhibit a reversible color change between yellow and red‐brown. The associated structural changes were monitored by in situ temperature‐dependent powder X‐ray diffraction (PXRD). The (BED)2CuCl6 exhibits superior thermal stability, with a thermochromic working temperature up to 443 K. The conductivity of (BED)2CuCl6 changes over six orders of magnitude upon temperature change. The 2D perovskites exhibit ferromagnetic properties with Curie temperatures around 13 K.

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“…[1][2][3][4][5] Even though other optoelectronic devices like light emitting diodes and lasers are being researched, [6][7][8][9][10][11][12][13] perovskite-based photovoltaics (PV) is the key technology driving the fast emergence of perovskitebased optoelectronics. [1][2][3][4][5] Even though other optoelectronic devices like light emitting diodes and lasers are being researched, [6][7][8][9][10][11][12][13] perovskite-based photovoltaics (PV) is the key technology driving the fast emergence of perovskitebased optoelectronics.…”

mentioning

confidence: 99%

Electron‐Beam‐Evaporated Nickel Oxide Hole Transport Layers for Perovskite‐Based Photovoltaics

Abzieher

Moghadamzadeh

Schackmar

et al. 2019

Advanced Energy Materials

141

149

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application-oriented research like process engineering and upscaling is observed. [1][2][3][4][5] Even though other optoelectronic devices like light emitting diodes and lasers are being researched, [6][7][8][9][10][11][12][13] perovskite-based photovoltaics (PV) is the key technology driving the fast emergence of perovskitebased optoelectronics. Recently, power conversion efficiencies (PCEs) close to 24% were demonstrated for perovskite PV, exceeding the PCEs of established thinfilm technologies. [14] Despite the rapid progress in terms of PCE, one key challenge of perovskite-based PV is still its low stability under realistic outdoor stress conditions-temperature, humidity, and ultraviolet (UV) radiation. A significant advance toward more stable devices was demonstrated by engineering the composition of the large cation site of the perovskite crystal structure and by including low-dimensional perovskite interlayers and passivation layers. [15][16][17][18][19][20] Further advances in stability are based on the charge extracting materials and their interfaces with the perovskite absorber layers. [21][22][23] Most reported record PCEs are still based on highly expensive organic hole transport layer (HTL) materials like 2,2′,7,7′-tetrakis[N,N-di (4methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-MeOTAD) or poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA). [20,24,25] Although these materials result in good performance on short High-quality charge carrier transport materials are of key importance for stable and efficient perovskite-based photovoltaics. This work reports on electron-beam-evaporated nickel oxide (NiO x ) layers, resulting in stable power conversion efficiencies (PCEs) of up to 18.5% when integrated into solar cells employing inkjet-printed perovskite absorbers. By adding oxygen as a process gas and optimizing the layer thickness, transparent and efficient NiOx hole transport layers (HTLs) are fabricated, exhibiting an average absorptance of only 1%. The versatility of the material is demonstrated for different absorber compositions and deposition techniques. As another highlight of this work, all-evaporated perovskite solar cells employing an inorganic NiO x HTL are presented, achieving stable PCEs of up to 15.4%. Along with good PCEs, devices with electron-beam-evaporated NiO x show improved stability under realistic operating conditions with negligible degradation after 40 h of maximum power point tracking at 75 °C. Additionally, a strong improvement in device stability under ultraviolet radiation is found if compared to conventional perovskite solar cell architectures employing other metal oxide charge transport layers (e.g., titanium dioxide). Finally, an all-evaporated perovskite solar mini-module with a NiO x HTL is presented, reaching a PCE of 12.4% on an active device area of 2.3 cm 2 .

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Highly Efficient Spectrally Stable Red Perovskite Light‐Emitting Diodes

Cited by 203 publications

References 49 publications

Operational stability of perovskite light emitting diodes

Operational stability of perovskite light emitting diodes

Reversible Thermochromism and Strong Ferromagnetism in Two‐Dimensional Hybrid Perovskites

Electron‐Beam‐Evaporated Nickel Oxide Hole Transport Layers for Perovskite‐Based Photovoltaics

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