Fast dissociation and reduced auger recombination of multiple excitons in closely packed PBS nanocrystal thin films

Taishi Nishihara, Hirokazu Tahara, Makoto Okano, Masashi Ono, Yoshihiko Kanemitsu

研究成果: Article査読

21 被引用数 (Scopus)

抄録

Exciton decay dynamics in chemically treated PbS quantum-dot (QD) films have been studied using femtosecond transient-absorption (TA) spectroscopy. In photoconductive QD films, a decay component with a lifetime of a few nanoseconds appeared in the TA signals because of exciton dissociation under weak excitation. Increasing excitation fluence resulted in additional fast-decay components corresponding to the lifetimes of multiple excitons, which decreased with increasing photoconductivity of the closely packed QD films. Auger recombination in photoexcited QDs was suppressed in highly photoconductive films. Our findings clearly show that the carrier transfer between the QDs dominates the lifetimes of single and multiple excitons.

本文言語English
ページ(範囲)1327-1332
ページ数6
ジャーナルJournal of Physical Chemistry Letters
6
8
DOI
出版ステータスPublished - 2015 4 16
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 物理化学および理論化学

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