English

Beijing Institute of Technology has made significant progress in the study of ultrafast carrier dynamics in optoelectronic functional crystals

1143
2024-02-21 14:08:27
See translation

Recently, teachers and students from the Institute of Solid State Laser and Ultrafast Photonics at the School of Physics and Optoelectronic Engineering have made significant progress in the study of ultrafast carrier dynamics in optoelectronic functional crystals. The related research results are titled "Anisotropic carrier dynamics and laser fabricated luminosity patterns on oriented single crystal perovskite wafers" and published online in the international authoritative journal Nature Communications, The research results are of great significance for promoting the practical application process of functional crystals in the field of optoelectronics.

The first author of the paper is Beijing University of Technology, with Ge Chao, an assistant researcher at the School of Physics and Optoelectronic Engineering, and Li Yachao, a doctoral student, as co first authors. Ge Chao, an assistant researcher at Beijing University of Technology, and Song Haiying, an associate researcher, are co corresponding authors. Professor Zhang Wenkai from Beijing Normal University and Professor Liu Yang from Shandong University are also co corresponding authors. This study has been supported by projects such as the National Natural Science Foundation of China and the Beijing Municipal Education Commission Research Program.

In recent years, perovskite materials and their applications in the field of optoelectronics have attracted widespread attention. However, a deep understanding of their anisotropic behavior in ultrafast carrier dynamics is still insufficient. To compensate for this deficiency, the research team, based on high-quality MAPbBr3 single crystal wafers with different orientations, for the first time revealed the polarization of photo excited charge carriers within crystal planes with different orientations and the anisotropic dynamic evolution between crystal planes at the picosecond time scale. This discovery provides a deeper understanding of the relaxation pathways of ultrafast charge carriers from a crystallographic perspective, which is of great significance for exploring and expanding the applications of perovskite single crystals in the field of ultrafast optoelectronics, such as light modulators, high-speed polarization sensors, and ballistic transistors.

In addition, by using femtosecond laser two-photon processing technology, the research team successfully prepared three orders of magnitude fluorescence enhanced luminescent patterns. An in-depth analysis of the fluorescence enhancement mechanism from the perspectives of multidimensional space (bulk and micro/nanoscale) and time (steady-state and transient) provides a convenient top-down strategy for improving the photoluminescence intensity of bulk crystals. This study provides a profound understanding of the ultrafast carrier dynamics of MAPbBr3 from a crystallographic perspective, with the hope of providing more guidance for the orientation selection and utilization of perovskite hot carriers in optoelectronics in the future.

The dynamic evolution of photo excited charge carriers on the (100), (110), and (111) crystal planes of MAPbBr3 and the mechanism of femtosecond laser-induced fluorescence enhancement.

Source: OFweek

Related Recommendations
  • Laser Wire Solutions and HumanTek Jointly Enter the Korean Laser Wire Stripping Market

    Recently, Laser Wire Solutions officially welcomed its important distribution partner in South Korea - HumanTek. This cooperation marks the official establishment of HumanTek as a branch of Laser Wire Solutions in Korea, and both parties will work together to provide excellent services for the Korean laser wire stripping market.HumanTek, with its deep foundation in the Korean market and strong pro...

    2024-07-03
    See translation
  • Alliance unit Radiant High Tech Blue Purple Laser Assists in Ocean Exploration

    The ocean covers over 71% of the Earth's surface, and so far humans have only explored about 5% of the ocean. This means that there are still 95% of the depths of the ocean that we know nothing about, making it the most mysterious and unknown place on our planet.600 years ago, Zheng He led a fleet to play the prelude to the era of great navigation, laying the foundation for us to understand the wo...

    2023-11-06
    See translation
  • 2D photoelectric neuron array can achieve broadband and low loss optical nonlinearity accessible to ambient light

    Light can calculate functions during propagation and interaction with structured materials, with fast speed and low energy consumption. The use of all optical neural networks for general computing requires an optical activation layer with nonlinear dependence on the input. However, existing optical nonlinear materials either have slow speeds or very weak nonlinearity at the level of natural light ...

    2024-03-20
    See translation
  • Progress in Calibration of Large Aperture Diffractive Lenses in the High Power Laser Physics Joint Laboratory of Shanghai Institute of Optics and Mechanics

    Recently, the High Power Laser Physics Joint Laboratory of Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, proposed a single exposure interferometric calibration method for large aperture diffractive lenses, which provides strong support for the engineering application of large aperture diffractive lenses. The relevant achievements are published in Optics Letters as "...

    2023-10-14
    See translation
  • Opton Laser commercializes ultra-high contrast third-order autocorrelators

    Recently, Opton Laser International, a supplier specializing in photonics, is currently distributing manufacturer UltraFast Innovations (UFI)'s ultra-high contrast third-order autocorrelator Tundra++. The new generation Tundra aims to characterize the temporal intensity distribution and quality of laser pulses with particularly high sensitivity.This is to avoid the harmful effects caused by the hi...

    2023-08-31
    See translation