Journal Article Near infrared light induced plasmonic hot hole transfer at a nano-heterointerface

Lian, Zichao  ,  Sakamoto, Masanori  ,  Matsunaga, Hironori  ,  Vequizo, Junie Jhon M.  ,  Yamakata, Akira  ,  Haruta, Mitsutaka  ,  Kurata, Hiroki  ,  Ota, Wataru  ,  Sato, Tohru  ,  Teranishi, Toshiharu

92018-06-13 , Springer Nature
新しいプラズモン誘起キャリア移動機構の発見 --赤外光エネルギーの利用に期待--. 京都大学プレスリリース. 2018-06-27.
Localized surface plasmon resonance (LSPR)-induced hot-carrier transfer is a key mechanism for achieving artificial photosynthesis using the whole solar spectrum, even including the infrared (IR) region. In contrast to the explosive development of photocatalysts based on the plasmon-induced hot electron transfer, the hole transfer system is still quite immature regardless of its importance, because the mechanism of plasmon-induced hole transfer has remained unclear. Herein, we elucidate LSPR-induced hot hole transfer in CdS/CuS heterostructured nanocrystals (HNCs) using time-resolved IR (TR-IR) spectroscopy. TR-IR spectroscopy enables the direct observation of carrier in a LSPR-excited CdS/CuS HNC. The spectroscopic results provide insight into the novel hole transfer mechanism, named plasmon-induced transit carrier transfer (PITCT), with high quantum yields (19%) and long-lived charge separations (9.2 μs). As an ultrafast charge recombination is a major drawback of all plasmonic energy conversion systems, we anticipate that PITCT will break the limit of conventional plasmon-induced energy conversion.

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