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Solution‐Based Processing of Optoelectronically Active Indium Selenide

Journal Article · · Advanced Materials
 [1];  [1];  [1];  [1];  [2];  [3];  [3];  [4]
  1. Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA
  2. Applied Physics Graduate Program Northwestern University Evanston IL 60208 USA
  3. Department of Inorganic Chemistry University of Chemistry and Technology Prague Technicka 5, 166 28 Prague 6 Czech Republic
  4. Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA, Applied Physics Graduate Program Northwestern University Evanston IL 60208 USA, Department of Chemistry Electrical Engineering and Computer Science Northwestern University Evanston IL 60208 USA
Abstract

Layered indium selenide (InSe) presents unique properties for high‐performance electronic and optoelectronic device applications. However, efforts to process InSe using traditional liquid phase exfoliation methods based on surfactant‐assisted aqueous dispersions or organic solvents with high boiling points compromise electronic properties due to residual surface contamination and chemical degradation. Here, these limitations are overcome by utilizing a surfactant‐free, low boiling point, deoxygenated cosolvent system. The resulting InSe flakes and thin films possess minimal processing residues and are structurally and chemically pristine. When employed in photodetectors, individual InSe nanosheets exhibit a maximum photoresponsivity of ≈5 × 10 7 A W −1 , which is the highest value of any solution‐processed monolithic semiconductor to date. Furthermore, the surfactant‐free cosolvent system not only stabilizes InSe dispersions but is also amenable to the assembly of electronically percolating InSe flake arrays without posttreatment, which enables the realization of ultrahigh performance thin‐film photodetectors. This surfactant‐free, deoxygenated cosolvent approach can be generalized to other layered materials, thereby presenting additional opportunities for solution‐processed thin‐film electronic and optoelectronic technologies.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0001059
OSTI ID:
1463920
Alternate ID(s):
OSTI ID: 1537381
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 38 Vol. 30; ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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