Assessment of hot-carrier effects on charge separation in type-II CdS/CdTe heterostructured nanorods

Makoto Okano, Masanori Sakamoto, Toshiharu Teranishi, Yoshihiko Kanemitsu

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Charge separation in semiconducting materials is an essential process that determines the efficiency of photovoltaic devices and photocatalysts. Herein, we report the charge-separation dynamics in type-II CdS/CdTe heterostructured nanorods revealed by femtosecond transient-absorption (TA) measurements with a broad-band white-light probe. Under selective excitation of the CdTe segment, bleaching signals at the band gap energy of CdS were clearly observed with a rise component on a subpicosecond time scale, which indicates efficient electron transfer from CdTe to CdS. The pump-energy dependence of the TA dynamics shows that hot electrons rapidly relax to the bottom of the conduction band of CdTe, and then the electrons transfer to the CdS segment. SECTION: Spectroscopy, Photochemistry, and Excited States

Original languageEnglish
Pages (from-to)2951-2956
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume5
Issue number17
DOIs
Publication statusPublished - 2014 Sep 4
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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