Phosphine-Free Synthesis of p-Type Copper(I) Selenide Nanocrystals in Hot Coordinating Solvents

Deka, Sasanka; Genovese, Alessandro; Zhang, Yang; Miszta, Karol; Bertoni, Giovanni; Krahne, Roman; Giannini, Cinzia; Manna, Liberato

doi:10.1021/ja103223x

Cited by 231 publications

(266 citation statements)

References 28 publications

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“…Despite a red shift of the plasmon resonance is observed, in parallel with the red--shift of the optical absorption at the band--edge, the plasma response remains well defined and may be expected to have interesting applications [50]. Colloidal copper selenide nanocrystal synthesis has been described in many reports, including work from Deka et al [51], Dorfs et al [36] and Kriegel et al [52]. In Figure 5 TEM images of the synthesised copper selenide nanocrystals are reported.…”

Section: Chemical Synthesis and Structural Properties Of Heavily--dopmentioning

confidence: 99%

Plasmonics in heavily-doped semiconductor nanocrystals

et al. 2013

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Abstract:Heavily--doped semiconductor nanocrystals characterized by a tunable plasmonic band have been gaining increasing attention recently. Herein, we introduce this type of materials focusing on their structural and photo--physical properties. Beside their continuous--wave plasmonic response, depicted both theoretically and experimentally, we also review recent results on their transient ultrafast response. This was successfully interpreted by adapting models of the ultrafast response of noble metal nanoparticles. IntroductionThe optical features exhibited by metallic nano--systems have been the subject of an intensive theoretical and experimental research, resulting in applications in several fields, from surface--enhanced spectroscopy, to biological and chemical nano--sensing [1]. Such developments are primarily due to the localized surface plasmon resonance (LSPR), which results in intense optical absorption and scattering as well as sub--wavelength localization of large electrical fields in the vicinity of the nano--object [2--10]. The plasmonic response of these metallic nanostructures is strongly dependent on the type of metal of which they are made, on the dielectric function of the surrounding medium, on the particle shape and, even if to a lesser extent, on the particle size. Nanoparticles of several metals, such as Ag, Au, Cu and Pt, exhibiting plasmonic response in the ultraviolet and in the visible regions of the spectrum have been successfully synthesized in the past decades [11--15]. Elongated metallic nanoparticles have been shown to exhibit plasmonic response in the near infrared, due to excitation of the longitudinal plasmon mode [16--18]. It has been recently reported that direct optical excitation of the metal by intense femtosecond laser pulses induces an ultra--fast modulation of the plasmonic resonance, which can be used for ultra--fast modulation of signals [19], paving the way to ultrafast active plasmonics. A quantitative investigation of such dynamical features is therefore crucial for the development of a new generation of ultra--fast nano--devices. Pump--probe spectroscopy, giving access to the electronic excitation and subsequent relaxation processes in the material, is to date the most suitable tool for the experimental study of the ultrafast dynamical features exhibited by plasmonic nanostructures. So far, several noble metal structures have been investigated, including spherical nanoparticles [20--22] and nanorods [23], revealing that the physical processes of excitation and relaxation are actually similar to those observed in bulk (i.e. in thin films) metallic systems, that are the electron--electron, the electron--phonon and the phonon--phonon interactions [24,25].

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Section: Chemical Synthesis and Structural Properties Of Heavily--dopmentioning

confidence: 99%

Plasmonics in heavily-doped semiconductor nanocrystals

et al. 2013

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“…30 Therefore, controllable synthesis of materials with new crystal structures, especially metastable structures such as wurtzite, is opening up an avenue to develop nanomaterials with new exciting properties and applications. 8,11,14,27,30 This encourages us to investigate the formation of ternary and multiple component chalcogenides with wurtzite structure. In this paper, we, for the first time, reported the synthesis of CZTSe quaternary NCs with wurtzite structure, their formation mechanism and the use in high-performance hybrid photodetector.…”

Section: Introductionmentioning

confidence: 99%

“…25,26 On the other hand, it is well known that the composition and structure of NCs significantly affect their optical and electrical properties, and the structure can be tuned by source materials, capping ligands, as well as synthetic temperature. 8,13,14,27,28 The reported Cu 2 ZnSn(S,Se) 4 NCs mostly show the stannite or kesterite structures. [19][20][21][22]25 Recently, Li and coworkers 26 reported the Cu 2 ZnSnS 4 NCs with wurtzite structure, which has been found in many binary and ternary chalcogenides, but seldom in quaternary compounds.…”

Section: Introductionmentioning

confidence: 99%

Wurtzite Cu2ZnSnSe4 nanocrystals for high-performance organic–inorganic hybrid photodetectors

2012

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Indium-free quaternary chalcogenide, Cu 2 ZnSnSe 4 (CZTSe), has driven much attention for its potential application in photovoltaics and optoelectronics. It is well known that the composition and structure of nanocrystals (NCs) significantly affect their optical and electrical properties. Controllable synthesis of materials with new crystal structures, especially metastable structures, has given impetus to the development of nanomaterials with many new exciting properties and applications. Highquality CZTSe NCs with thermodynamically metastable wurtzite phase and optical band gap of 1.46 eV were herein synthesized via a facile, lost-cost and safe-solution method. The formation mechanism of the wurtzite CZTSe NCs was investigated in detail, which indicates high reaction rate and low surface energy are favorable for the formation of wurtzite structure. The promising application of as-synthesized NCs in photovoltaics and optoelectronics has been demonstrated by the high-performance hybrid photodetector made from CZTSe NCs and P3HT, with an on/off ratio larger than 150.

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“…An example is the cuprous selenide (Cu 2 Se) nanoparticles, which are easily oxidized into non-stoichiometric Cu 1.8 Se, and become into surprisingly good p-type semiconductor with over 3000 times of enhancements in electrical conductivity. [2] In order to tune the properties of nano-scale copper selenides, a number of techniques and strategies, such as hydro-or solvo-thermal approach, [2,15,16] sonochemistry, [17] electrochemical-deposition, [18] microwave-assistant route, [19] ball milling technique, [6] and chemical welding method, [5] have been developed to prepare nanocrystals, [20] nanotubes/wires, [15,[21][22][23] nanocages, [24] dendrimers, [16,25] and nanosheets [26] with well-defined size, morphology, crystal structure, and composition.…”

Section: Introductionmentioning

confidence: 99%