Solution-processed graphene–nanographene van der Waals heterostructures for photodetectors with efficient and ultralong charge separation - Archive ouverte HAL Access content directly
Journal Articles Journal of the American Chemical Society Year : 2021

Solution-processed graphene–nanographene van der Waals heterostructures for photodetectors with efficient and ultralong charge separation

(1) , (1) , (2) , (1) , (2) , (3) , (4) , (3) , (3) , (5, 6) , (5, 6) , (5, 6) , (2, 7) , (2) , (2) , (1) , (1) , (1)
1
2
3
4
5
6
7
Shuai Fu
Xuelin Yao
Gvido Bratina
Mischa Bonn
Klaus Müllen

Abstract

Sensitization of graphene with inorganic semiconducting nanostructures has been demonstrated as a powerful strategy to boost its optoelectronic performance. However, the limited tunability of optical properties and toxicity of metal cations in the inorganic sensitizers prohibits their widespread applications, and the in-depth understanding of the essential interfacial charge-transfer process within such hybrid systems remains elusive. Here, we design and develop high-quality nanographene (NG) dispersions with a large-scale production using high-shear mixing exfoliation. The physisorption of these NG molecules onto graphene gives rise to the formation of graphene–NG van der Waals heterostructures (VDWHs), characterized by strong interlayer coupling through $\pi$–$\pi$ interactions. As a proof of concept, photodetectors fabricated on the basis of such VDWHs show ultrahigh responsivity up to 4.5 × 10$^7$ A/W and a specific detectivity reaching 4.6 × 10$^{13}$ Jones, being competitive with the highest values obtained for graphene-based photodetectors. The outstanding device characteristics are attributed to the efficient transfer of photogenerated holes from NGs to graphene and the long-lived charge separation at graphene–NG interfaces (beyond 1 ns), as elucidated by ultrafast terahertz (THz) spectroscopy. These results demonstrate the great potential of such graphene–NG VDWHs as prototypical building blocks for high-performance, low-toxicity optoelectronics.
Fichier principal
Vignette du fichier
islandora_124263.pdf (2.16 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

cea-03374221 , version 1 (22-10-2021)

Identifiers

Cite

Zhaoyang Liu, Haixin Qiu, Shuai Fu, Can Wang, Xuelin Yao, et al.. Solution-processed graphene–nanographene van der Waals heterostructures for photodetectors with efficient and ultralong charge separation. Journal of the American Chemical Society, 2021, 143 (41), pp.17109-17116. ⟨10.1021/jacs.1c07615⟩. ⟨cea-03374221⟩
86 View
45 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More