排序方式: 共有3条查询结果,搜索用时 15 毫秒
1
1.
2.
Megaelectronvolt ultrafast electron diffraction(UED) is a promising detection tool for ultrafast processes.The quality of diffraction image is determined by the transverse evolution of the probe bunch. In this paper, we study the contributing terms of the emittance and space charge effects to the bunch evolution in the MeV UED scheme, employing a mean-field model with an ellipsoidal distribution as well as particle tracking simulation. The small transverse dimension of the drive laser is found to be critical to improve the reciprocal resolution, exploiting both smaller emittance and larger transverse bunch size before the solenoid. The degradation of the reciprocal spatial resolution caused by the space charge effects should be carefully controlled. 相似文献
3.
本文首次通过旋涂热解偏钨酸铵((NH4)6H2W12O40)的DMF/水溶液成功制备了致密的三氧化钨(WO3)薄膜, 系统研究了WO3薄膜厚度及用异丙醇冲洗处理气相辅助溶液法制备的CH3NH3PbI3薄膜对相应钙钛矿太阳电池光伏性能的影响. 结果表明, 使用厚度为62nmWO3致密层的平板钙钛矿太阳电池获得了短路电流密度17.39 mA.cm-2, 开路电压0.58 V, 填充因子0.57, 相应光电转化效率5.72%. 使用异丙醇冲洗CH3NH3PbI3薄膜后, 相应太阳电池的光电转化效率由5.72 % 升高到7.04 %. 相似文献
1