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量子效率是表征负电子亲和势（NEA）光电阴极发射性能的最重要的特性参数，准确建立量子效率公式为揭示各个阴极参量对整体性能的影响以及NEA光电阴极的优化设计提供了重要的理论指导.在对NEA光电阴极体内及表面光电发射过程的分析基础上，考虑入射光子能量、表面能带弯曲区以及表面势垒对电子发射的影响，对表面逸出概率和电子衰减长度进行了修正，并利用积分法推导了NEA光电阴极的量子效率公式，其理论预测曲线与实验曲线基本一致，从而验证了修正公式的实用性.为NEA光电阴极的研究提供了有效的理论参考依据.
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关键词:
- 负电子亲和势光电阴极 /
- 量子效率 /
- 能带弯曲区 /
- 衰减长度
Quantum efficiency （QE） is one of the most important characteristics of photoemission performance of negative electron affinity （NEA） photocathodes. The quantum efficiency formulas for NEA photocathodes show the influences of photocathode parameters on photoemission performance and also provide theoretical guidance for optimum design of photocathodes. The photoemission process in bulk and surface of NEA photocathodes is firstly analyzed. Surface electron escape probability and attenuation length are respectively revised considering the effects of incident photon energy，surface band bending region and surface barrier on photoemission. The quantum efficiency formulas for NEA photocathodes are established by integration method. The theoretically estimated QE curve is consistent with the experimental one，which validates the practicability of the revised QE formula. This work can provide theoretical references for research of NEA photocathodes.-
Keywords:
- negative electron affinity photocathodes /
- quantum efficiency /
- band bending region /
- attenuation length
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