Photoluminescence from single CdSe quantum rods

Chen, X.; Nazzal, Amjad; Peng, Zhé; Peng, Xiaogang

doi:10.1016/s0022-2313(02)00225-9

Cited by 32 publications

(13 citation statements)

References 20 publications

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“…Over the past several years, considerable advances have been made toward the synthesis of colloidal semiconductor nanorods or nanofibers with diameters sufficiently small to produce quantum confinement of charge carriers. Semiconductor quantum rods (QRs) are visible at the transition between zero-dimensional quantum dots (QDs) and one-dimensional quantum wires. − QR volumes are larger than those of QDs, and therefore, they have significantly larger per-particle absorbance cross sections . This is expected to increase the optical density of electrodes covered by up to a single layer of nanoparticles and therefore improve light harvesting.…”

mentioning

confidence: 99%

Synthesis and Optical Properties of Lead-Free Cesium Tin Halide Perovskite Quantum Rods with High-Performance Solar Cell Application

Chen

Lee

Chuang

et al. 2016

J. Phys. Chem. Lett.

272

144

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Herein, the fabrication of a lead-free cesium tin halide perovskite produced via a simple solvothermal process is reported for the first time. The resulting CsSnX (X = Cl, Br, and I) quantum rods show composition-tunable photoluminescence (PL) emissions over the entire visible spectral window (from 625 to 709 nm), as well as significant tunability of the optical properties. In this study, we demonstrate that through hybrid materials (CsSnX) with different halides, the system can be tunable in terms of PL. By replacing the halide of the CsSnX quantum rods, a power conversion efficiency of 12.96% under AM 1.5 G has been achieved. This lead-free quantum rod replacement has demonstrated to be an effective method to create an absorber layer that increases light harvesting and charge collection for photovoltaic applications in its perovskite phase.

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confidence: 99%

Synthesis and Optical Properties of Lead-Free Cesium Tin Halide Perovskite Quantum Rods with High-Performance Solar Cell Application

Chen

Lee

Chuang

et al. 2016

J. Phys. Chem. Lett.

272

144

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“…The optical properties of NRs, however, differ significantly from those of NCs. Compared to NCs, the NRs show higher photoluminescence (PL) quantum efficiency [2], strongly linear polarized PL [6,7], an increase of the global Stokes shift [6], and significantly faster carrier relaxation [8]. The Auger processes in NRs are strongly suppressed relative to those in NCs [9,10], which subsequently decreases the optical pumping threshold for stimulated emission [10,11].…”

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confidence: 99%

1D Exciton Spectroscopy of Semiconductor Nanorods

2004

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We have theoretically shown that optical properties of semiconductor nanorods are controlled by 1D excitons. The theory, which takes into account anisotropy of spacial and dielectric confinement, describes size dependence of interband optical transitions, exciton binding energies. We have demonstrated that the fine structure of the ground exciton state explains the linear polarization of photoluminescence. Our results are in good agreement with the measurements in CdSe nanorods.PACS numbers: 71.70.Gm, 77.22.Ej There is growing interest in nano-size crystalline semiconductor structures of various shapes such as nanocrystals (NCs) [1], nanorods (NRs) [2] and nanowires (NWs) [3] created by the "from the bottom up" technological approach. Size-tunable control of their optical and transport properties combined with the ability to move these nano-size objects around with precise control opens the exciting possibilities for the creation of new functional materials which can be used in unlimited applications. Among these nanostructures, the NCs are the most heavily studied and one can find a broad description of their properties and their potential applications in the reviews of Brus [4] and Alivisatos [5].The optical properties of NRs, however, differ significantly from those of NCs. Compared to NCs, the NRs show higher photoluminescence (PL) quantum efficiency [2], strongly linear polarized PL [6,7], an increase of the global Stokes shift [6], and significantly faster carrier relaxation [8]. The Auger processes in NRs are strongly suppressed relative to those in NCs [9,10], which subsequently decreases the optical pumping threshold for stimulated emission [10,11]. The size and shape dependence of the optical and tunneling gaps measured in CdSe NRs [12] shows an unexpectedly large difference that cannot be explained by the electron-hole Coulomb correction to the optical gap used for NCs. To describe their measurements Katz et al.[12] applied the four-band theory developed by Sercel and Vahala [13]. The most important result of the latter paper was the prediction of an inverse order of light and heavy hole subbands in NWs, which was later confirmed by semiempirical pseudopotential calculations [6,14,15] and numerical calculations within the 6 band model [16]. An anisotropy of the light hole-toelectron optical transition matrix element predicts some degree of the PL linear polarization parallel to the NW [17,18].The dielectric confinement connected with the difference between dielectric constants of semiconductor crystallites, κ s , and surrounding medium, κ m , (for example, see [19]) usually does not affect the optical spectra of NCs because the charge distributions of an excited electron and hole practically compensate each other at each point of the NC. This leads to a complete screening of an electric field of the total charge from penetration into the surrounding medium. This is not the case, however, in NRs where the electron and hole are at a distance larger than a NR radius and interact predominantly throu...

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“…1.2.1 Composition. Based on elemental composition, metallic QDs can be classified as (1) group II-VI, which includes cadmium selenide (CdSe), [8][9][10][11] cadmium sulfide (CdS), 12,13 cadmium telluride (CdTe), 14,15 (2) group III-V, which includes indium phosphide (InP) 16,17 and indium arsenide (InAs), 18 (3) group I-III-VI including copper indium sulfide (CuInS 2 ), 19 and ( 4) pervoskites (e.g., ABX 3 ) [20][21][22] (Table 1) (Fig. S1 ‡).…”

Section: Physicochemical Properties Of Qdsmentioning

confidence: 99%