Tabletop time-resolved soft x-ray spectrometer
Abstract
We propose to build a state-of-the-art ultrafast time-resolved visible pump x-ray probespectrometer that will enable the visualization of atomic/chemically specific charge dynamics incomplex heterogeneous energy materials. This new time-resolved x-ray instrument will strengthenour group’s advantage in developing and using state-of-the-art ultrafast equipment forcharacterizing molecular conformation and ultrafast charge dynamics of energy materials, underthe support of DoD. In addition, this proposed instrumental development will greatly strengthenand facilitate the education of students with respect to the advanced research of ultrafast chargedynamics.The proposed high harmonic generation based time-resolved x-ray spectrometer will enable theunique capability of tracking time dependent dynamics of both electron and hole – atunprecedented atomic/chemical specificity and sub-femtosecond temporal resolution. Its noveltycan be summarized as follows: (1) Atomic/chemical specificity allows site-specific dynamics to bemonitored; (2) Broad spectral coverage enables multiple atomic/chemical site dynamics to beprobed simultaneously; (3) Distinct electron and hole peaks allow electron and hole dynamics tobe disentangled; (4) Sub- to few-femtosecond time resolution enables fast dynamics studies, and(5) Compact instrumental size with high photon flux enables more access to the instrument. Thisnew instrument will reveal new, currently unknown, knowledge about energy materials, such ascharge excitation and separations at the first few-femtosecond, chemical sites of charge traps, andspatial locations of electrons and holes. It can also be implemented on a variety of energy materials,including, but not limited to, hybrid perovskite solar cells, quantum dots, two-dimensionalsemiconductor, and dye sensitized solar cells.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 11, 2018
- Source ID
- FA95501810451
Entities
People
- Wei Xiong
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of California, San Diego