Ultrathin Two‐Dimensional Organic–Inorganic Hybrid Perovskite Nanosheets with Bright, Tunable Photoluminescence and High Stability

Yang, Shuang; Niu, Wenxin; Wang, An‐Liang; Fan, Zhanxi; Chen, Bo; Tan, Chaoliang; Lu, Qipeng; Zhang, Hua

doi:10.1002/anie.201701134

Angew Chem Int Ed

2017

DOI: 10.1002/anie.201701134

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Ultrathin Two‐Dimensional Organic–Inorganic Hybrid Perovskite Nanosheets with Bright, Tunable Photoluminescence and High Stability

Shuang Yang¹,

Wenxin Niu²,

An‐Liang Wang³

et al.

Abstract: Two-dimensional (2D) organic-inorganic hybrid perovskite nanosheets (NSs) are attracting increasing research interest due to their unique properties and promising applications. Here, for the first time, we report the facile synthesis of single- and few-layer free-standing phenylethylammonium lead halide perovskite NSs, that is, (PEA) PbX (PEA=C H NH , X=Cl, Br, I). Importantly, their lateral size can be tuned by changing solvents. Moreover, these ultrathin 2D perovskite NSs exhibit highly efficient and tunable… Show more

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Cited by 226 publications

(160 citation statements)

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“…They can be easily grown by both solution methods and vapor transport methods at low temperature, [14][15][16][17] with a tunable bulk direct bandgap. As a consequence of the dielectric and quantum confinement effect, they show strongly bound and stable excitons at room temperature.…”

mentioning

confidence: 99%

Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Fang

Yang

Adjokatse

et al. 2019

Adv Funct Materials

118

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2D perovskite materials have recently reattracted intense research interest for applications in photovoltaics and optoelectronics. As a consequence of the dielectric and quantum confinement effect, they show strongly bound and stable excitons at room temperature. Here, the band-edge exciton fine structure and in particular its exciton and biexciton dynamics in high quality crystals of (PEA) 2 PbI 4 are investigated. A comparison of bulk and surface exciton lifetimes yields a room temperature surface recombination velocity of 2 × 10 3 cm s −1 and an intrinsic lifetime of 185 ns. Biexciton emission is evidenced at room temperature, with a binding energy of ≈45 meV and a lifetime of 80 ps. At low temperature, exciton state splitting is observed, which is caused by the electron-hole exchange interaction. Transient photoluminescence resolves the low-lying dark exciton state, with a bright/dark splitting energy estimated to be 10 meV. This work contributes to the understanding of the complex scenario of the elementary photoexcitations in 2D perovskites. materials such as transition metal dichalcogenides, phosphorene, and graphene. They can be easily grown by both solution methods and vapor transport methods at low temperature, [14][15][16][17] with a tunable bulk direct bandgap. [18] These advantages make them appealing for future optoelectronic and photonic applications.Unlike their 3D counterparts, the dielectric and quantum confinement of carriers in the 2D perovskite layers gives rise to unusually strong excitonic effects. [19,20] It has been experimentally observed that excitons are tightly confined in the inorganic layers with binding energy as high as a few hundred millielectronvolts (significantly higher than that of 3D perovskites). [21] This greatly enhanced exciton binding energy makes them particularly interesting for light-emitting applications. [8,22] Moreover, 2D perovskites can exhibit a variety of multiexciton species, including biexcitons and trions. [20,23,24] The presence of these quasiparticles is exciting due to their unique role, leading to a better understanding of many body effects and their great promise for photonic applications. In addition, recent experiments reveal an important role of electron-phonon couplings on the exciton dynamics in 2D lead-iodide perovskite, suggesting a complex scenario for carrier relaxation and exciton formation. [25,26] It is therefore crucial to understand elementary photoexcitations in these layered materials. However, exciton fine structures and their properties are usually masked by local energy fluctuations resulting from disorder in thin films or broad emission due to the formation of self-trapped excitons. [27] Whereas their steady-state optical properties have

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mentioning

confidence: 99%

Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Fang

Yang

Adjokatse

et al. 2019

Adv Funct Materials

118

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“…[14][15][16][17][18][19][20] Especially, perovskite LEDs are very promising because of the remarkably tunable photoluminescence (PL) properties. [21][22][23][24][25][26][27] Perovskite materials are low cost, and their reasonable ionization energy is comparable to that of conventional hole-injection materials for LEDs. These advantages make perovskite materials suitable for alternative emitters that can overcome the shortcomings of organic LEDs, such as complex material synthesis, expensive fabrication process, and poor color purity.…”

mentioning

confidence: 99%

Dimensionally Engineered Perovskite Heterostructure for Photovoltaic and Optoelectronic Applications

Heo

Seo

Cho

et al. 2019

Advanced Energy Materials

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Organometal halide perovskites are emerging materials for photovoltaics and light emitting diodes. The latest power-conversion efficiency of perovskite solar cells is 24.2%, and the light-emitting diode efficiency has exceeded 21%. Since the structure of the solar cell and light-emitting diode (LED) is different from each other, the integration of their structures into Although 2D|3D has shown potential for application in multifunctional devices, the principle of operation for multifunction devices (SOLAR Cell-LED: SOLED) has not yet been revealed. However, most studies have reported that the devices have only one auspicious characteristic. Here in this study the SOLED devices are monitored and investigated in a 2D|3D heterostructure with a multidimensional perovskite. It is fond that a 2D|3D heterostructure with a multidimensional perovskite interface induces carrier transmission from the interface, increasing the density of electrons and holes, and increasing their recombination. An interface-engineered perovskite 2D|3D-heterojunction structure is employed to realize the multifunctional photonic device in on-chip, exhibiting overall power conversion efficiencies of photovoltaics up to 21.02% under AM1.5, and external quantum efficiency of the light-emitting diode up to 5.13%. This novel phenomenon is attributed to carrier transfer resulting in a high carrier density and enhanced carrier recombination at the 2D|3D interface.on-chip device architecture enhances one performance but deteriorates the other, and vice versa. Here, we employed an interface-engineered perovskite 2D|3Dheterojunction structure to realize the multifunctional photonic device in onchip, exhibiting power conversion efficiencies of photovoltaics up to 21.02% under AM1.5, and external quantum efficiency of the light emitting diode up to 5.13%. This novel phenomenon is attributed to carrier transfer resulting in a high carrier density and enhanced carrier recombination at the 2D|3D interface. As the demand for research on a variety of optoelectronic applications increases, the dual function of converting solar cells, detectors, light-emitting diodes, transistors, etc., into various forms of energy and signals and producing reverse energy and signals has become attractive. Especially, organic lead halide perovskites which were introduced initially as a light-absorbing layer of photovoltaics in 2009, [1] have been disruptive to the photovoltaics and their latest power conversion efficiency reaching 24.2%. [2] Efficient free charge generation, [3][4][5][6] long carrier lifetime, [7,8] and long transport length [9] of perovskites endowed their solar cells the exceptional performance. Furthermore, the tunability of the optical and electrical

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“…Motivated by the breakthrough development of three‐dimensional (3D) MAPbI 3 (MA = CH 3 NH 3 ), two‐dimensional (2D) layered organic‐inorganic hybrid perovskites (OIHPs) have also taken a promising position in the optoelectronic field . For these 2D layered OIHPs, the inorganic frameworks comprised of metal‐halide octahedra contribute greatly to their intriguing semiconducting properties, while organic components account for advantages of structural diversity and easy fabrication process .…”

mentioning

confidence: 99%

Exploring a Polar Two‐dimensional Multi‐layered Hybrid Perovskite of (C₅H₁₁NH₃)₂(CH₃NH₃)Pb₂I₇ for Ultrafast‐Responding Photodetection

Han

Wang

Zhang

et al. 2018

Laser & Photonics Reviews

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Although organic‐inorganic hybrid perovskites demonstrate promising potentials for photodetection, one great challenge still to be addressed is their relatively low responding speed (often at the magnitude order of ∼ms). Herein, a solution‐processed photodetector based on polar two‐dimensional (2D) multilayered hybrid perovskite crystal is fabricated, (C5H11NH3)2(CH3NH3)Pb2I7 (EMA, where C5H11NH3+ is n‐pentylaminium), which exhibits an ultrafast responding time of ≈1.52 μs. This figure‐of‐merit is faster at least by 2–4 orders than other reported 2D organic‐inorganic hybrid perovskite photodetectors. To the best of knowledge, this is the record‐fast response‐speed for lateral‐type devices of 2D organic‐inorganic hybrid perovskite. Such ultrafast responding can be attributed to the high crystallinity and quite low density of defects and traps. In addition, this device also presents a high photocurrent on/off ratio (>103) and extremely low dark current (≈10−10 A), indicating its potential applications for high‐efficiency photodetectors. Our results pave the pathway toward ultrafast responding photodetection of 2D organic‐inorganic hybrid perovskites.

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Ultrathin Two‐Dimensional Organic–Inorganic Hybrid Perovskite Nanosheets with Bright, Tunable Photoluminescence and High Stability

Cited by 226 publications

References 35 publications

Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Dimensionally Engineered Perovskite Heterostructure for Photovoltaic and Optoelectronic Applications

Exploring a Polar Two‐dimensional Multi‐layered Hybrid Perovskite of (C₅H₁₁NH₃)₂(CH₃NH₃)Pb₂I₇ for Ultrafast‐Responding Photodetection

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Ultrathin Two‐Dimensional Organic–Inorganic Hybrid Perovskite Nanosheets with Bright, Tunable Photoluminescence and High Stability

Cited by 226 publications

References 35 publications

Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Dimensionally Engineered Perovskite Heterostructure for Photovoltaic and Optoelectronic Applications

Exploring a Polar Two‐dimensional Multi‐layered Hybrid Perovskite of (C5H11NH3)2(CH3NH3)Pb2I7 for Ultrafast‐Responding Photodetection

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Product

Resources

About

Exploring a Polar Two‐dimensional Multi‐layered Hybrid Perovskite of (C₅H₁₁NH₃)₂(CH₃NH₃)Pb₂I₇ for Ultrafast‐Responding Photodetection