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Chinese Physics C> 2012, Vol. 36> Issue(6) : 531-537  DOI: 10.1088/1674-1137/36/6/009

The QE numerical simulation of PEAsemiconductor photocathode

  • Several kinds of models have already been proposed to explain the photoemission process. The exact photoemission theory of the semiconductor photocathode was not well established after decades of research. In this paper an integral equation of quantum efficiency (QE) is constructed to describe the photoemission of positive electron affinity (PEA) of the semiconductor photocathode based on the three-step photoemission model. Various factors (e.g., forbidden band gap, electron affinity, photon energy, incident angle, degree of polarization, refractive index, extinction coefficient, initial and final electron energy, relaxation time, external electric field and so on) have an impact on the QE of the PEA semiconductor photocathode, which are entirely expressed in the QE equation. In addition, a simulation code is also programmed to calculate the QE of the K2CsSb photocathode theoretically at 532 nm wavelength. By and large, the result is in line with the expected experimental value. The reasons leading to the distinction between the experimental and theoretical QE are discussed.
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    [1] Dowell D H et al. Nucl. Instrum. Methods A, 2010, 622(3): 685-697[2] Burrill A et al. Multi-alkali photocathode development at Brookhaven National Lab for application in superconducting photoinjectors. In: Proceedings of PAC. 2005, Tennessee, USA, 2005. 2672-2674[3] Dowell D H et al. Phys. Rev. Spec. Top-Ac, 2006, 9(6): 063502[4] Dowell D H, Schmerge J F. Phys. Rev. Spec. Top-Ac, 2009, 12(7): 074201[5] Smedley J et al. Phys. Rev. Spec. Top-Ac, 2008, 11(1): 013502[6] Smedley J et al. J. Appl. Phys., 2005, 98(4): 043111[7] Spicer W E, Herrera-Gomez A. Modern theory and applications of photocathodes. In: Proceeding of SPIE 2022. San Diego, USA, 1993. 18-33[8] Jensen K L et al. J. Appl. Phys., 2006, 99(12): 124905[9] Jensen K L et al. J. Appl. Phys., 2008, 104(4): 044907[10] Hallensleben S et al. Opt. Commun, 2000, 180(1-3): 89-102[11] Motta D, Schonert S. Nucl. Instrum. Methods A, 2005, 539(1-2): 217-235[12] Kalarasse L et al. J. Phys. Chem. Solids, 2010, 71(3): 314-322[13] Bazarov I et al. Appl. Phys. Lett., 2011, 98(22): 224101[14] Cultrera. L et al. Growth And Characterization of Bialkali Photocathodes For Cornell ERL Injector. In: Proceedings of PAC2011. New York, USA. URL:www.c-ad.bnl.gov/pac2011/proceedings/papers/wep244.pdf[15] Vecchione T et al. Appl. Phys. Lett., 2011, 99(3): 034103[16] Kalarasse L et al. J. Phys. Chem. Solids, 2010, 71(12): 1732-1741[17] Ghosh C, Varma B P. J. Appl. Phys., 1978, 49(8): 4549-4553

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LI Xu-Dong, GU Qiang, ZHANG Meng and ZHAO Ming-Hua. The QE numerical simulation of PEAsemiconductor photocathode[J]. Chinese Physics C, 2012, 36(6): 531-537. doi: 10.1088/1674-1137/36/6/009
LI Xu-Dong, GU Qiang, ZHANG Meng and ZHAO Ming-Hua. The QE numerical simulation of PEAsemiconductor photocathode[J]. Chinese Physics C, 2012, 36(6): 531-537.  doi: 10.1088/1674-1137/36/6/009 shu
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Received: 2011-08-30
Revised: 1900-01-01
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The QE numerical simulation of PEAsemiconductor photocathode

    Corresponding author: LI Xu-Dong,
    Corresponding author: ZHAO Ming-Hua,
  • Received Date: 2011-08-30
  • Accepted Date: 1900-01-01
  • Available Online: 2012-06-05

Abstract: Several kinds of models have already been proposed to explain the photoemission process. The exact photoemission theory of the semiconductor photocathode was not well established after decades of research. In this paper an integral equation of quantum efficiency (QE) is constructed to describe the photoemission of positive electron affinity (PEA) of the semiconductor photocathode based on the three-step photoemission model. Various factors (e.g., forbidden band gap, electron affinity, photon energy, incident angle, degree of polarization, refractive index, extinction coefficient, initial and final electron energy, relaxation time, external electric field and so on) have an impact on the QE of the PEA semiconductor photocathode, which are entirely expressed in the QE equation. In addition, a simulation code is also programmed to calculate the QE of the K2CsSb photocathode theoretically at 532 nm wavelength. By and large, the result is in line with the expected experimental value. The reasons leading to the distinction between the experimental and theoretical QE are discussed.

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