Efficient light-emitting diodes based on oriented perovskite nanoplatelets

Cui, Jieyuan; Liu, Yang; Deng, Yunzhou; Lin, Chen; Fang, Zhishan; Xiang, Chensheng; Bai, Peng; Du, Kai; Zuo, Xiaobing; Wen, Kaichuan; Gong, Shaolong; He, Haiping; Ye, Zhizhen; Gao, Yunan; Tian, He; Zhao, Baodan; Wang, Jianpu; Jin, Yizheng

doi:10.1126/sciadv.abg8458

Cited by 87 publications

(86 citation statements)

References 68 publications

(104 reference statements)

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“…This led to an enhancement in the outcoupling, and the perovskite LEDs achieved an EQE of 23.6%, which was the highest for LHP LEDs at the time of publication in 2020. [ 230 ]…”

Section: From 3d To 0d: Effect Of Dimensionality On Recombination And...mentioning

confidence: 99%

The Role of Dimensionality on the Optoelectronic Properties of Oxide and Halide Perovskites, and their Halide Derivatives

Hoye

Hidalgo

Jagt

et al. 2021

Advanced Energy Materials

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Halide perovskite semiconductors have risen to prominence in photovoltaics and light‐emitting diodes (LEDs), but traditional oxide perovskites, which overcome the stability limitations of their halide counterparts, have also recently witnessed a rise in potential as solar absorbers. One of the many important factors underpinning these developments is an understanding of the role of dimensionality on the optoelectronic properties and, consequently, on the performance of the materials in photovoltaics and LEDs. This review article examines the role of structural and electronic dimensionality, as well as form factor, in oxide and halide perovskites, and in lead‐free alternatives to halide perovskites. Insights into how dimensionality influences the band gap, stability, charge‐carrier transport, recombination processes and defect tolerance of the materials, and the impact these parameters have on device performance are brought forward. Particular emphasis is placed on carrier/exciton‐phonon coupling, which plays a significant role in the materials considered, owing to their soft lattices and composition of heavy elements, and becomes more prominent as dimensionality is reduced. It is finished with a discussion of the implications on the classes of materials future efforts should focus on, as well as the key questions that need to be addressed.

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“…This led to an enhancement in the outcoupling, and the perovskite LEDs achieved an EQE of 23.6%, which was the highest for LHP LEDs at the time of publication in 2020. [ 230 ]…”

Section: From 3d To 0d: Effect Of Dimensionality On Recombination And...mentioning

confidence: 99%

The Role of Dimensionality on the Optoelectronic Properties of Oxide and Halide Perovskites, and their Halide Derivatives

Hoye

Hidalgo

Jagt

et al. 2021

Advanced Energy Materials

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“…Colloidal semiconductor nanoplatelets are materials characterized by large exciton binding energy and oscillator strength, sharp spectral features, − and short photoluminescence lifetimes, all properties that make them appealing in devices such as light-emitting diodes and lasers. ,− The extreme thinness, down to just a few atoms, is both the source of their unique optical properties and a major challenge for their structural characterization. Several studies have demonstrated that nanoplatelets can be much different from an ideal “slice” of the corresponding bulk material: they are structurally less constrained than the bulk and can readily relax through structural distortions and altered lattice constants .…”

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confidence: 99%

Structure and Surface Passivation of Ultrathin Cesium Lead Halide Nanoplatelets Revealed by Multilayer Diffraction

et al. 2021

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The research on two-dimensional colloidal semiconductors has received a boost from the emergence of ultrathin lead halide perovskite nanoplatelets. While the optical properties of these materials have been widely investigated, their accurate structural and compositional characterization is still challenging. Here, we exploited the natural tendency of the platelets to stack into highly ordered films, which can be treated as single crystals made of alternating layers of organic ligands and inorganic nanoplatelets, to investigate their structure by multilayer diffraction. Using X-ray diffraction alone, this method allowed us to reveal the structure of ∼12 Å thick Cs–Pb–Br perovskite and ∼25 Å thick Cs–Pb–I–Cl Ruddlesden–Popper nanoplatelets by precisely measuring their thickness, stoichiometry, surface passivation type and coverage, as well as deviations from the crystal structures of the corresponding bulk materials. It is noteworthy that a single, readily available experimental technique, coupled with proper modeling, provides access to such detailed structural and compositional information.

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“…Metal halide perovskites are a class of crystalline semiconductors that exhibit excellent optoelectronic properties including tunable emission, high photoluminescence quantum yield (PLQY), and high color purity, making them ideal for electroluminescence applications. − A unique advantage of perovskites is that high-quality semiconductor films can be in situ crystallized from precursor solutions by low-cost methods such as spin coating and blade coating. Great advances, including composition and solvent engineering, have been made in the control of in situ grown perovskite films, boosting the external quantum efficiencies (EQEs) of perovskite light-emitting diodes (PeLEDs) to over 23%. − …”

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confidence: 99%

Solvent-Vapor Atmosphere Controls the in Situ Crystallization of Perovskites

Xiu

Liu

Niu

et al. 2021

ACS Materials Lett.

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In situ crystallization of perovskites provides a promising approach to achieve high-quality semiconductor films ideal for optoelectronic devices. However, understanding of the complicated in situ crystallization processes of perovskites is still limited. Here, we report that controlling the solvent-vapor atmosphere in the spin-coating step leads to two distinct in situ crystallization modes of the perovskite films. A pure nitrogen atmosphere causes fast evaporation of the solvent of dimethyl sulfoxide (DMSO) and, in consequence, substrate-dependent crystallization processes. In contrast, an atmosphere with a controlled partial pressure of 15 Pa of DMSO slows down the evaporation rates, resulting in substrate-independent crystallization processes. The two in situ crystallization modes generate films of perovskite nanoplatelets exhibiting different thicknesses, optical properties, and hence, varied electroluminescent efficiencies. Our work suggests that the management of the solvent-vapor atmosphere during in situ crystallization of perovskite films provides a new dimension for controlling their structures and properties. Considering that solvent-vapor atmosphere is a basic parameter for all solution-based processes, our work is of general interest to the perovskite field.

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Efficient light-emitting diodes based on oriented perovskite nanoplatelets

Cited by 87 publications

References 68 publications

The Role of Dimensionality on the Optoelectronic Properties of Oxide and Halide Perovskites, and their Halide Derivatives

The Role of Dimensionality on the Optoelectronic Properties of Oxide and Halide Perovskites, and their Halide Derivatives

Structure and Surface Passivation of Ultrathin Cesium Lead Halide Nanoplatelets Revealed by Multilayer Diffraction

Solvent-Vapor Atmosphere Controls the in Situ Crystallization of Perovskites

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