Giant hot electron thermalization via stacking of graphene layers. (25th January 2023)
- Record Type:
- Journal Article
- Title:
- Giant hot electron thermalization via stacking of graphene layers. (25th January 2023)
- Main Title:
- Giant hot electron thermalization via stacking of graphene layers
- Authors:
- Du, Sichao
Xie, Hao
Yin, Juxin
Sun, Yunlei
Wang, Qiuting
Liu, Hong
Qi, Wei
Cai, Chunfeng
Bi, Gang
Xiao, Duo
Chen, Wenchao
Shen, Xiaoyan
Yin, Wen-Yan
Zheng, Rongkun - Abstract:
- Abstract: The capability of graphene to generate hot electrons is predicted to be effective in converting low energy photons into electrical currents for the mid-infrared photodetection [1, 2]. However, the quantum yield of such hot electrons is not sufficient due to the limited thickness of two-dimensional graphene [3-5]. Therefore, it raises the question whether the electron thermalization is efficient enough to generate a large number of hot electrons in graphitic materials as a detectable photocurrent. Here, an experimental demonstration of the sufficient hot electron generation in Bernal stacking sequence nano-graphite films is presented. A comprehensive layer number dependence (1–120-layers graphene) study verifies the strong hot electron scattering correlations, exhibiting intriguing two-dimensional properties into their bulk counterparts. Consequently, the spectral coverage of hot electrons promoted from mid-infrared (4 μm) to near-infrared (1.2–1.6 μm) energy level is achieved, leading to a 10 9 eV −1 cm −2 populated hot electron density for the mid-infrared photodetection. In addition, the consistently increased number of photo-excited electrons via stacking of graphene layers, results in a gradual evolution of subsequent electron thermalization. The proposed scheme for exploring the thickness dependence electron thermalization property of the graphitic material paves the way to design ultrafast and sensitive mid-infrared photodetecters. Graphical abstract: ImageAbstract: The capability of graphene to generate hot electrons is predicted to be effective in converting low energy photons into electrical currents for the mid-infrared photodetection [1, 2]. However, the quantum yield of such hot electrons is not sufficient due to the limited thickness of two-dimensional graphene [3-5]. Therefore, it raises the question whether the electron thermalization is efficient enough to generate a large number of hot electrons in graphitic materials as a detectable photocurrent. Here, an experimental demonstration of the sufficient hot electron generation in Bernal stacking sequence nano-graphite films is presented. A comprehensive layer number dependence (1–120-layers graphene) study verifies the strong hot electron scattering correlations, exhibiting intriguing two-dimensional properties into their bulk counterparts. Consequently, the spectral coverage of hot electrons promoted from mid-infrared (4 μm) to near-infrared (1.2–1.6 μm) energy level is achieved, leading to a 10 9 eV −1 cm −2 populated hot electron density for the mid-infrared photodetection. In addition, the consistently increased number of photo-excited electrons via stacking of graphene layers, results in a gradual evolution of subsequent electron thermalization. The proposed scheme for exploring the thickness dependence electron thermalization property of the graphitic material paves the way to design ultrafast and sensitive mid-infrared photodetecters. Graphical abstract: Image 1 … (more)
- Is Part Of:
- Carbon. Volume 203(2023)
- Journal:
- Carbon
- Issue:
- Volume 203(2023)
- Issue Display:
- Volume 203, Issue 2023 (2023)
- Year:
- 2023
- Volume:
- 203
- Issue:
- 2023
- Issue Sort Value:
- 2023-0203-2023-0000
- Page Start:
- 835
- Page End:
- 841
- Publication Date:
- 2023-01-25
- Subjects:
- Hot electrons -- Transient absorption -- Graphene -- Mid-infrared -- Auger recombination
Carbon -- Periodicals
Carbone -- Périodiques
Koolstof
Toepassingen
Electronic journals
546.681 - Journal URLs:
- http://www.sciencedirect.com/science/journal/00086223 ↗
http://www.elsevier.com/journals ↗ - DOI:
- 10.1016/j.carbon.2022.12.017 ↗
- Languages:
- English
- ISSNs:
- 0008-6223
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 3050.991000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 26955.xml