论文标题
含氮钻石（001）光电的光谱发射特性：热电子传输和横向动量过滤
Spectral Emission Properties of a Nitrogen-doped Diamond(001) Photocathode: Hot Electron Transport and Transverse Momentum Filtering
论文作者
论文摘要
使用可调（235-410nm）紫外线辐射源的单晶光电枪中插入的单晶氮掺杂钻石（001）光电阴极的电子发射特性，用于从背面的氮气中的光发射源和前面的晶状体晶体层面上的光发射。发射电子的平均横向能（MTE）和量子效率（QE）的测得的光谱趋势既异常且非单调型，但显示与（i）（i）（i）（i）（i）从氮气替代状态的电子兴奋的已知物理学一致的二颗氮替代状态到钻石的传统定位，（ii）二颗粒的传统特征，（ii）的二极管特性（ii）（ii）的二极管特征（ii）（ii （iii）晶体面的有效电子亲和力，（iv）钻石中强的电子（光学）声子耦合，以及（v）在能量等电位下与光学声子在能量等电位下相关的热电子传输动力学。值得注意的是，观察到的热电子发射显示出通过发射带状态的低横向有效质量平行于光电表面的限制 - 横向动量滤波效果。
The electron emission properties of a single-crystal nitrogen-doped diamond(001) photocathode inserted in a 10kV DC photoelectron gun are determined using a tunable (235-410nm) ultraviolet laser radiation source for photoemission from both the back nitrogen-doped substrate face and the front homo-epitaxially grown and undoped diamond crystal face. The measured spectral trends of the mean transverse energy (MTE) and quantum efficiency (QE) of the emitted electrons are both anomalous and non-monotonic, but are shown to be consistent with (i) the known physics of electron photoexcitation from the nitrogen substitution states into the conduction bands of diamond, (ii) the energy position and dispersion characteristics of the conduction bands of diamond in the (001) emission direction, (iii) the effective electron affinity of the crystal faces, (iv) the strong electron-(optical)phonon coupling in diamond, and (v) the associated hot electron transport dynamics under energy equipartition with the optical phonons. Notably, the observed hot electron emission is shown to be restricted parallel to the photocathode surface by the low transverse effective masses of the emitting band states - a transverse momentum filtering effect.
