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Sökning: WFRF:(Feng Minjun)

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1.
  • Wu, Bo, et al. (författare)
  • Strong self-trapping by deformation potential limits photovoltaic performance in bismuth double perovskite
  • 2021
  • Ingår i: Science Advances. - : American Association for the Advancement of Science. - 2375-2548. ; 7:8
  • Tidskriftsartikel (refereegranskat)abstract
    • Bismuth-based double perovskite Cs2AgBiBr6 is regarded as a potential candidate for low-toxicity, high-stability perovskite solar cells. However, its performance is far from satisfactory. Albeit being an indirect bandgap semiconductor, we observe bright emission with large bimolecular recombination coefficient (reaching 4.5 +/- 0.1 x 10(-11) cm(3) s(-1)) and low charge carrier mobility (around 0.05 cm(2) s(-1) V-1). Besides intermediate Frohlich couplings present in both Pb-based perovskites and Cs2AgBiBr6, we uncover evidence of strong deformation potential by acoustic phonons in the latter through transient reflection, time-resolved terahertz measurements, and density functional theory calculations. The Frohlich and deformation potentials synergistically lead to ultrafast self-trapping of free carriers forming polarons highly localized on a few units of the lattice within a few picoseconds, which also breaks down the electronic band picture, leading to efficient radiative recombination. The strong self-trapping in Cs2AgBiBr6 could impose intrinsic limitations for its application in photovoltaics.
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2.
  • Lin, Xihong, et al. (författare)
  • Effect of alloying on the dynamics of coherent acoustic phonons in bismuth double perovskite single crystals
  • 2021
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 29:5, s. 7948-7955
  • Tidskriftsartikel (refereegranskat)abstract
    • The bismuth double perovskite Cs2AgBiBr6 has been regarded as a potential candidate for lead-free perovskite photovoltaics. A detailed study on the coherent acoustic phonon dynamics in the pure, Sb- and T1-alloyed Cs2AgBiBr6 single crystals is performed to understand the effects of alloying on the phonon dynamics and band edge characteristics. The coherent acoustic phonon frequencies are found to be independent of the alloying, while the damping rates are highly dependent on the alloying. Based on the mechanism of coherent acoustic phonon damping, a technique has been successfully developed that can accurately extract the absorption spectra near the indirect band gap for these single crystals with coefficients on the order of 10(2) cm(-1). (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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