Lijie Wang王理杰

I watch light-driven carriers in time with ultrafast spectroscopy, and in space and time with ultrafast electron microscopy.

用超快光谱追踪光生载流子的时间演化，用超快电子显微镜同时在空间和时间上看清它们的运动。

I am a Research Scientist at King Abdullah University of Science and Technology (KAUST), Saudi Arabia, developing and applying four-dimensional scanning ultrafast electron microscopy (4D-SUEM) and in situ ultrafast spectroscopy. My work at KAUST began in 2022, when I joined the Ultrafast Laser Spectroscopy and Four-Dimensional Electron Imaging Lab of Prof. Omar F. Mohammed as a postdoctoral fellow. Before joining KAUST, I received my PhD in Photonics from École Polytechnique Fédérale de Lausanne (EPFL), Switzerland, in 2022, where I worked with Prof. Majed Chergui on broadband deep-UV transient absorption spectroscopy. My earlier academic training was in materials science in China.

我是沙特阿卜杜拉国王科技大学（King Abdullah University of Science and Technology, KAUST）研究科学家，致力于四维扫描超快电子显微镜（4D-SUEM）与原位超快光谱的发展与应用。2022 年，我以博士后身份加入 Omar F. Mohammed 教授的超快激光光谱与四维电子成像实验室，开始在 KAUST 的工作。此前，我于 2022 年在瑞士洛桑联邦理工学院（École Polytechnique Fédérale de Lausanne, EPFL）获得光子学博士学位，师从 Majed Chergui 教授，从事深紫外宽频瞬态吸收光谱研究。更早的学术训练是在国内的材料科学领域。

My research investigates how light-generated carriers and excited states form, relax and move across semiconductor surfaces and interfaces from femtoseconds to nanoseconds. These ultrafast processes govern how efficiently materials used in solar cells and optoelectronic devices convert absorbed light into electrical current or light emission. By combining broadband femtosecond pump–probe spectroscopy with 4D-SUEM, my work seeks to uncover the microscopic origins of energy loss and inefficient transport, and ultimately determine how carrier dynamics can be controlled to push materials and devices closer to their intrinsic performance limits.

我的研究关注光生载流子与激发态如何在飞秒到纳秒的时间尺度上，于半导体表面和界面处产生、弛豫和输运。这些超快过程决定了太阳能电池和光电器件所用材料将吸收的光转化为电流或发光的效率。通过结合宽频飞秒泵浦–探测光谱与 4D-SUEM，我的工作致力于揭示能量损失和低效输运的微观起源，并最终弄清如何调控载流子动力学，使材料与器件更接近其本征性能极限。