Photoemission and optical processes in multialkali photocathodes

Ghosh, C.

doi:10.1103/physrevb.22.1972

Cited by 24 publications

(15 citation statements)

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“…The electronic structure calculations on the alkali antimonides have remained the central point of attention in the theoretical studies [12][13][14][15][16][17][18][19]. Ghosh [13] used the empirical pseudopotential method for calculating the band structure and the electronic properties of Cs 3 Sb. The theoretical study on the structural stability of the alkali antimonides along with the intermetallic compounds have been done by Christensen [14] using the linear muffin tin orbital (LMTO) method.…”

Section: Introductionmentioning

confidence: 99%

Structural, elastic, electronic and optical properties of bi-alkali antimonides

Murtaza

Ullah

et al. 2016

Bull Mater Sci

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The structural parameters, elastic constants, electronic and optical properties of the bi-alkali antimonides (Na 2 KSb, Na 2 RbSb, Na 2 CsSb, K 2 RbSb, K 2 CsSb and Rb 2 CsSb) were calculated using state-of-the-art density functional theory. Different exchange-correlation potentials were adopted to predict the physical properties of these compounds. The calculated structural parameters are found in good agreement with the available experimental and theoretical results. All the compounds are mechanically stable. The compounds Na 2 KSb, K 2 RbSb, K 2 CsSb and Rb 2 CsSb have direct bandgaps, in which chemical bonding among the cations and anions is mainly ionic. Furthermore, the optical properties of these compounds are described in detail in terms of the dielectric function, refractive index, reflectivity, optical conductivity and absorption coefficient.

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Section: Introductionmentioning

confidence: 99%

Structural, elastic, electronic and optical properties of bi-alkali antimonides

Murtaza

Ullah

et al. 2016

Bull Mater Sci

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“…The band structure have been calculated by empirical pseudopotential method and pseudopotential [11]. Christensen [26] have used the linear muffin tin orbitals method in the atomic sphere approximation (LMTO-ASA) to study the structural phase stability of a series of intermetallic compounds including the alkali antimonides.…”

Section: Introductionmentioning

confidence: 99%

“…Since the earlier investigation [1][2][3][4][5][6][7][8], alkali antimonide compounds have attracted much attention and extensive experimental studies on their properties have been carried out [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Optical properties of the alkali antimonide semiconductors , , and

Kalarasse

Bennecer

Kalarasse

2010

Journal of Physics and Chemistry of Solids

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“…The primary cause is an onset of electron-electron (e-e) collisions: e-e scattering events are prevented until the final states of both electrons can reside in the conduction band of K 2 CsSb. 15 This means that for photon energies below the observed peak in QE, electrons excited from the top of the valence band, for example, do not have enough excess energy to scatter with another electron (because their final states would lie within the bandgap). This leaves phonon scattering as the only scattering mechanism and QE continues to rise with increasing incident photon energy until the final states of two collisional electrons can both lie in the conduction band.…”

Section: Photoemission Measurementsmentioning

confidence: 99%

Active bialkali photocathodes on free-standing graphene substrates

Yamaguchi

Liu

DeFazio³

et al. 2017

npj 2D Mater Appl

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The hexagonal structure of graphene gives rise to the property of gas impermeability, motivating its investigation for a new application: protection of semiconductor photocathodes in electron accelerators. These materials are extremely susceptible to degradation in efficiency through multiple mechanisms related to contamination from the local imperfect vacuum environment of the host photoinjector. Few-layer graphene has been predicted to permit a modified photoemission response of protected photocathode surfaces, and recent experiments of single-layer graphene on copper have begun to confirm these predictions for single crystal metallic photocathodes. Unlike metallic photoemitters, the integration of an ultra-thin graphene barrier film with conventional semiconductor photocathode growth processes is not straightforward. A first step toward addressing this challenge is the growth and characterization of technologically relevant, high quantum efficiency bialkali photocathodes on ultra-thin freestanding graphene substrates. Photocathode growth on free-standing graphene provides the opportunity to integrate these two materials and study their interaction. Specifically, spectral response features and photoemission stability of cathodes grown on graphene substrates are compared to those deposited on established substrates. In addition, we observed an increase of work function for the graphene encapsulated bialkali photocathode surfaces, which is predicted by our calculations. The results provide a unique demonstration of bialkali photocathodes on free-standing substrates, and indicate promise towards our goal of fabricating high-performance graphene encapsulated photocathodes with enhanced lifetime for accelerator applications.

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Photoemission and optical processes in multialkali photocathodes

Cited by 24 publications

References 20 publications

Structural, elastic, electronic and optical properties of bi-alkali antimonides

Structural, elastic, electronic and optical properties of bi-alkali antimonides

Optical properties of the alkali antimonide semiconductors , , and

Active bialkali photocathodes on free-standing graphene substrates

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