Preparation of Cu<sub>2</sub>Se Single Crystals and Investigation of their Electrical Properties

Abdullaev, G. B.; Aliyarova, Z. A.; Asadov, G. A.

doi:10.1002/pssb.19670210203

Cited by 38 publications

(17 citation statements)

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“…While Sharma et al [10,19] and Padam [11] has obtained a direct band gap of around 1.2 eV. The cuprous selenide single crystal however, gives absorption edge at 1.2 eV [12]. The wide variation in band gaps are thought to be due to sharp cut off of the wavelength with spectral transmittance instead of slow increase [10], wide range of stiochiometric deviation, the presence of large number of dislocations, changes in barrier height due to variation in grain size in polycrystalline films and quantum size effect [13].…”

Section: Introductionmentioning

confidence: 94%

Physical, optical and electrical properties of copper selenide (CuSe) thin films deposited by solution growth technique at room temperature

Gosavi

Deshpande

Gudage

et al. 2008

Journal of Alloys and Compounds

121

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Section: Introductionmentioning

confidence: 94%

Physical, optical and electrical properties of copper selenide (CuSe) thin films deposited by solution growth technique at room temperature

Gosavi

Deshpande

Gudage

et al. 2008

Journal of Alloys and Compounds

121

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“…Some fundamental limitations related to the physics of noble metals would be overcome by changing the free-carrier density of the semiconductor material 54 through carefully designing the chemical synthesis technology to control heavily doped, nonstoichiometric ratios in the semiconductor NP composites. Although many extensive studies of the metallic behavior of heavily doped semiconductors in bulk materials and films were performed almost 40 years ago, 55 the development of ultra-small semiconductor NPs with controllable free-carrier densities for tuning their plasmonic absorption peak position is still in its infancy and remains a great challenge.…”

Section: Chalcogenide-based Nanomaterialsmentioning

confidence: 99%

Revisiting the classification of NIR-absorbing/emitting nanomaterials for in vivo bioapplications

et al. 2016

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With the development of nonlinear optics and new imaging methods, near-infrared (NIR) light can excite contrast agents to probe biological specimens both functionally and structurally with a deeper imaging depth and a higher spatial resolution than linear optical approaches. There is considerable and growing interest in how biological specimens respond to NIR light. Moreover, the visible absorption band of most functional nanomaterials becomes NIR-excitable through multiphoton processes, thus allowing multifunctional imaging and combined therapy with noble metal and magnetic nanoparticles both in vitro and in vivo. A groundbreaking example is the use of different laser techniques to excite single-type NIR-absorbing/emitting nanomaterials to produce multiphoton emission by femtosecond lasers using either a remote control system for photodynamic therapy or photo-induced chemical bond dissociation. These techniques provided superior anatomical resolution and detection sensitivity for in vivo tumor-targeted imaging than those offered by conventional methods. Here we summarize the most recent progress in the development of smart NIR-absorbing/emitting nanomaterials for in vivo bioapplications.

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“…sulphide, selenide and telluride. In 1967, Abdullaev et al described the preparation of Cu2Se single crystals [39]. They reported the degeneration of the hole gas in these crystals that seemed to be due to structural imperfections of Cu2--xSe introduced during the chemical synthesis, as confirmed by X--ray analysis.…”

Section: Bulk Chalcogenide Semiconductorsmentioning

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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Preparation of Cu₂Se Single Crystals and Investigation of their Electrical Properties

Cited by 38 publications

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Physical, optical and electrical properties of copper selenide (CuSe) thin films deposited by solution growth technique at room temperature

Physical, optical and electrical properties of copper selenide (CuSe) thin films deposited by solution growth technique at room temperature

Revisiting the classification of NIR-absorbing/emitting nanomaterials for in vivo bioapplications

Plasmonics in heavily-doped semiconductor nanocrystals

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Preparation of Cu2Se Single Crystals and Investigation of their Electrical Properties

Cited by 38 publications

References 0 publications

Physical, optical and electrical properties of copper selenide (CuSe) thin films deposited by solution growth technique at room temperature

Physical, optical and electrical properties of copper selenide (CuSe) thin films deposited by solution growth technique at room temperature

Revisiting the classification of NIR-absorbing/emitting nanomaterials for in vivo bioapplications

Plasmonics in heavily-doped semiconductor nanocrystals

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Preparation of Cu₂Se Single Crystals and Investigation of their Electrical Properties