| Autor: |
Chen-Xia Hu, Xin Tong, Jing-Yin Xu, Rui-Tong Liu, Haiguang Zhao, Xin Li, Ali Imran Channa, Federico Rosei, Lucas V. Besteiro, Alexander O. Govorov, Zhiming Wang, Qiang Wang |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
Nanoscale. 13(36) |
| ISSN: |
2040-3372 |
| Popis: |
“Giant” core/shell quantum dots (g-QDs) are promising candidates for emerging optoelectronic technologies thanks to their facile structure/composition-tunable optoelectronic properties and outstanding photo-physical/chemical stability. Here, we synthesized a new type of CuInTeSe (CITS)/CdS g-QDs and regulated their optoelectronic properties by controlling the shell thickness. Through increasing the shell thickness, as-prepared g-QDs exhibited tunable red-shifted emission (from 900 to 1200 nm) and prolonged photoluminescence (PL) lifetimes (up to ∼14.0 μs), indicating a formed band structure showing efficient charge separation and transfer, which is further testified by theoretical calculations and ultrafast time-resolved transient absorption (TA) spectroscopy. These CITS/CdS g-QDs with various shell thicknesses can be employed to fabricate photoelectrochemical (PEC) cells, exhibiting improved photoresponse and stability as compared to the bare CITS QD-based devices. The results indicate that the rational design and engineering of g-QDs is very promising for future QD-based optoelectronic technologies. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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