Flexible Vertical p-n Diode Photodetectors with Thin N-type MoSe2 Films Solution-Processed on Water Surfaces

Ihn Hwang, Jong Sung Kim, Sung Hwan Cho, Beomjin Jeong, Cheolmin Park

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Two-dimensional (2D) nanosheets of transition metal dichalcogenides (TMDs) are of significant interest for potential photoelectronic applications. However, the fabrication of solution-processed arrays of mechanically flexible thin TMD films-based vertical type p-n junction photodetectors over a large area is a great challenge. Our method is based on controlled solvent evaporation of MoSe2 suspension spread on water surface. Single or few-layered MoSe2 nanosheets modified with the dispersant amine-terminated poly(styrene) (PS-NH2) were homogeneously deposited and stacked on water upon solvent evaporation, giving rise to uniform MoSe2/PS-NH2 composite films that can be readily transferred onto other substrates. A p-n junction vertical diode of Al/p-type Si/p-type poly(9,9-di-n-octylfluorenyl-2,7-diyl)/n-type MoSe2 composite/Au stacked from bottom to top exhibited characteristic rectifying current behavior upon voltage sweep with a rectification ratio of 103. Subsequent illumination of near-infrared light on the device resulted in a substantially enhanced dark current of approximately 103 times greater than that of the nonexposed device. The photodetection performance, that is, switching time, responsivity, and detectivity, were 100.0 ms, 2.5 AW-1, and 2.34 × 1014, respectively. Furthermore, the performance of mechanically flexible photodetectors devices was comparable with that of the devices fabricated on the hard Si substrate even after 1000 bending cycles at a bending diameter of 7.2 mm.

Original languageEnglish
Pages (from-to)34543-34552
Number of pages10
JournalACS Applied Materials and Interfaces
Volume10
Issue number40
DOIs
Publication statusPublished - 2018 Oct 10

Fingerprint

Nanosheets
Photodetectors
Transition metals
Evaporation
Diodes
Styrene
Water
Dark currents
Composite films
Substrates
Amines
Suspensions
Lighting
Infrared radiation
Fabrication
Composite materials
Electric potential

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Hwang, Ihn ; Kim, Jong Sung ; Cho, Sung Hwan ; Jeong, Beomjin ; Park, Cheolmin. / Flexible Vertical p-n Diode Photodetectors with Thin N-type MoSe2 Films Solution-Processed on Water Surfaces. In: ACS Applied Materials and Interfaces. 2018 ; Vol. 10, No. 40. pp. 34543-34552.
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Flexible Vertical p-n Diode Photodetectors with Thin N-type MoSe2 Films Solution-Processed on Water Surfaces. / Hwang, Ihn; Kim, Jong Sung; Cho, Sung Hwan; Jeong, Beomjin; Park, Cheolmin.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 40, 10.10.2018, p. 34543-34552.

Research output: Contribution to journalArticle

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