2023-03-02 オーストラリア連邦研究会議(ARC)
彼らは、金ナノロッドとセレン化カドミウムの先端でできたナノメートルサイズの「マッチスティック」を作成し、最適な構造を作成することで、最大45％の電荷抽出効率に達する可能性を実証した。
この手法が重要なエネルギー収集および産業アプリケーションにどのような約束を持つかを示す研究結果は、ACS Nano誌に掲載されている。
＜関連情報＞
- https://excitonscience.com/news/let-there-be-light-boosting-solar-efficiency-nano-matchsticks
- https://pubs.acs.org/doi/10.1021/acsnano.2c10892
金属-半導体ナノ結晶におけるプラズモニックホットキャリア抽出のための最適形状 Optimal Geometry for Plasmonic Hot-Carrier Extraction in Metal–Semiconductor Nanocrystals
Lesly V. Melendez, Joel Van Embden, Timothy U. Connell, Noel W. Duffy and Daniel E. Gómez
ACS Nano Published:February 21, 2023
DOI:https://doi.org/10.1021/acsnano.2c10892
Abstract
Plasmon-induced energy and charge transfer from metal nanostructures hold great potential for harvesting solar energy. Presently, the efficiencies of charge-carrier extraction are still low due to the competitive ultrafast mechanisms of plasmon relaxation. Using single-particle electron energy loss spectroscopy, we correlate the geometrical and compositional details of individual nanostructures to their carrier extraction efficiencies. By removing ensemble effects, we are able to show a direct structure–function relationship that permits the rational design of the most efficient metal–semiconductor nanostructures for energy harvesting applications. In particular, by developing a hybrid system comprising Au nanorods with epitaxially grown CdSe tips, we are able to control and enhance charge extraction. We show that optimal structures can have efficiencies as high as 45%. The quality of the Au–CdSe interface and the dimensions of the Au rod and CdSe tip are shown to be critical for achieving these high efficiencies of chemical interface damping.
