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Slow Hot-Exciton Cooling and Enhanced Interparticle Excitonic Coupling in HgTe Quantum Dots

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  • المؤلفون: Fan, Kezhou; Sergeeva, Kseniia A.; Sergeev, Aleksandr A.; Zhang, Lu; Chan, Christopher Chang Sing; Li, Zhuo; Zhong, Xiaoyan; Kershaw, Stephen V.; Liu, Junwei; Rogach, Andrey L.; Wong, Kam Sing
  • نوع التسجيلة:
    Electronic Resource
  • الدخول الالكتروني :
    http://repository.hkust.edu.hk/ir/Record/1783.1-139580
    https://doi.org/10.1021/acsnano.4c05061
    http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=1936-0851&rft.volume=&rft.issue=&rft.date=2024&rft.spage=&rft.aulast=Fan&rft.aufirst=Ke&rft.atitle=Slow+Hot-Exciton+Cooling+and+Enhanced+Interparticle+Excitonic+Coupling+in+HgTe+Quantum+Dots&rft.title=ACS+NANO
    http://www.scopus.com/record/display.url?eid=2-s2.0-85197592387&origin=inward
    http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=001258188800001
  • معلومة اضافية
    • Publisher Information:
      Amer Chemical Soc 2024
    • نبذة مختصرة :
      Rapid hot-carrier/exciton cooling constitutes a major loss channel for photovoltaic efficiency. How to decelerate the hot-carrier/exciton relaxation remains a crux for achieving high-performance photovoltaic devices. Here, we demonstrate slow hot-exciton cooling that can be extended to hundreds of picoseconds in colloidal HgTe quantum dots (QDs). The energy loss rate is 1 order of magnitude smaller than bulk inorganic semiconductors, mediated by phonon bottleneck and interband biexciton Auger recombination (BAR) effects, which are both augmented at reduced QD sizes. The two effects are competitive with the emergence of multiple exciton generation. Intriguingly, BAR dominates even under low excitation fluences with a decrease in interparticle distance. Both experimental evidence and numerical evidence reveal that such efficient BAR derives from the tunneling-mediated interparticle excitonic coupling induced by wave function overlap between neighboring HgTe QDs in films. Thus, our study unveils the potential for realizing efficient hot-carrier/exciton solar cells based on HgTe QDs. Fundamentally, we reveal that the delocalized nature of quantum-confined wave function intensifies BAR. The interparticle excitonic coupling may cast light on the development of next-generation photoelectronic materials, which can retain the size-tunable confinement of colloidal semiconductor QDs while simultaneously maintaining high mobilities and conductivities typical for bulk semiconductor materials.
    • الموضوع:
      Hot-exciton cooling; HgTequantum dots; Phononbottleneck; Biexciton Auger recombination; Interparticleexcitonic coupling; Article
    • Availability:
      Open access content. Open access content
    • Note:
      English
    • Other Numbers:
      HNK oai:repository.hkust.edu.hk:1783.1-139580
      ACS Nano, v. 18, (27), July 2024, p. 18011-18021
      1936-0851
      1936-086X
      1452722809
    • Contributing Source:
      HONG KONG UNIV OF SCI & TECH, THE
      From OAIster®, provided by the OCLC Cooperative.
    • الرقم المعرف:
      edsoai.on1452722809
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