27 November 2012 Photoemission stability of negative electron affinity GaN photocathode
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The stability for reflection-mode GaN photocathode has been investigated by monitoring the photocurrent and the spectral response at room temperature. We watch that the photocurrent of the cathode decays with time in the vacuum system, and compare the spectral response curves after activation and after degradation. The photocurrent decay mechanism for reflection-mode NEA GaN photocathode was studied by the surface model [GaN (Mg) :Cs]:O-Cs. The reduction of the effective dipole quantity, which is caused by harmful gases, is the key factor of the photocurrent reduction.
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Junju Zhang, Junju Zhang, Xiaohui Wang, Xiaohui Wang, Wenzheng Yang, Wenzheng Yang, Weidong Tang, Weidong Tang, Xiaoqian Fu, Xiaoqian Fu, Biao Li, Biao Li, Benkang Chang, Benkang Chang, "Photoemission stability of negative electron affinity GaN photocathode", Proc. SPIE 8555, Optoelectronic Devices and Integration IV, 85551C (27 November 2012); doi: 10.1117/12.2001125; https://doi.org/10.1117/12.2001125


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