Rational design of colloidal AgGaS2/CdSeS core/shell quantum dots for solar energy conversion and light detection
| Autor: | Shuai Yue, Zhihang Long, Zhenhuan Zhao, Rui Wang, Cheng Liu, Xinfeng Liu, Zheming Zhang, Xin Tong, Xin Li, Ali Imran Channa, Yimin You, Zhiming Wang |
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| Rok vydání: | 2021 |
| Předmět: |
Photocurrent
Materials science Renewable Energy Sustainability and the Environment business.industry Exciton Shell (structure) Photodetector Quantum dot Optoelectronics General Materials Science Electrical and Electronic Engineering Electronic band structure business Absorption (electromagnetic radiation) Visible spectrum |
| Zdroj: | Nano Energy. 89:106392 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2021.106392 |
| Popis: | Colloidal quantum dots (QDs) with core/shell architecture can offer tailored electronic and optical properties which are promising for various optoelectronic applications. Here, we report the growth of multifunctional AgGaS2 (AGS)/CdSeS core/shell QDs via a simple two-step synthetic method. In comparison to the bare AGS QDs, as-synthesized core/shell QDs revealed enhanced visible light absorption, red-shifted emission and prolonged exciton lifetime, demonstrating the type II band alignment of the AGS core and CdSeS shell structure for improved charge separation/transfer, as further verified by the measured ultrafast carrier dynamics. The heterostructured core/shell QDs were used to fabricate both the photoelectrochemical (PEC) cells and photodetectors for efficient solar energy conversion and light detection, showing a maximum photocurrent density of ~4.8 mA/cm2 under visible light irradiation and a detectivity of 3.3 × 1010 Jones under wavelength of 510 nm, respectively. These findings indicate that the rational design of core/shell architecture is promising to tailor the optoelectronic properties and band structure of QDs for versatile and high-performance optoelectronic applications. |
| Databáze: | OpenAIRE |
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