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

Makoto Okano; Masanori Sakamoto; Toshiharu Teranishi; Yoshihiko Kanemitsu

doi:10.1021/jz501564q

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 journal › Article › peer-review

18 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 language	English
Pages (from-to)	2951-2956
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	5
Issue number	17
DOIs	https://doi.org/10.1021/jz501564q
Publication status	Published - 2014 Sept 4
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Physical and Theoretical Chemistry

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10.1021/jz501564q

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

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",

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AU - Okano, Makoto

AU - Sakamoto, Masanori

AU - Teranishi, Toshiharu

AU - Kanemitsu, Yoshihiko

PY - 2014/9/4

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AB - 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

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

Abstract

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UN SDGs

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