Ultrafast Hot-Carrier Photovoltaics of Type-I Monolayer Heterojunctions in the Broad Spectral Ranges

Ji Ho Sung, Soonyoung Cha, Hoseok Heo, Sangwan Sim, Juho Kim, Hyunyong Choi, Moon Ho Jo

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Strong interlayer photoresponses in monolayer (ML) semiconductor stacks, such as substantial light absorption and charge separation across interlayer band alignments, suggest potentials for two-dimensional photovoltaics (PVs). Here, we report an interlayer PV conversion in a type-I ML heterojunction by ultrafast interlayer transfer of photoexcited hot carriers in the broad spectral ranges. Specifically, low-energy photoexcitation on a stack of a narrow-band-gap (Eg) Bi2Te3 few-layer and a large-Eg MoS2 ML permits interlayer transfer of transient hot carriers from the Bi2Te3 layer to the excitonic states of the neighboring MoS2 ML within a time scale of ∼70 fs, producing interlayer charge separation. Thereby we achieve substantial conversion efficiency from a MoS2 ML with visible to infrared light illumination.

Original languageEnglish
Pages (from-to)429-434
Number of pages6
JournalACS Photonics
Volume4
Issue number3
DOIs
Publication statusPublished - 2017 Mar 15

Fingerprint

Semiconductors
Hot carriers
Lighting
Heterojunctions
heterojunctions
interlayers
Monolayers
Light
polarization (charge separation)
photovoltaic conversion
Photoexcitation
Light absorption
Conversion efficiency
electromagnetic absorption
photoexcitation
Energy gap
narrowband
Semiconductor materials
Infrared radiation
illumination

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

Sung, Ji Ho ; Cha, Soonyoung ; Heo, Hoseok ; Sim, Sangwan ; Kim, Juho ; Choi, Hyunyong ; Jo, Moon Ho. / Ultrafast Hot-Carrier Photovoltaics of Type-I Monolayer Heterojunctions in the Broad Spectral Ranges. In: ACS Photonics. 2017 ; Vol. 4, No. 3. pp. 429-434.
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Ultrafast Hot-Carrier Photovoltaics of Type-I Monolayer Heterojunctions in the Broad Spectral Ranges. / Sung, Ji Ho; Cha, Soonyoung; Heo, Hoseok; Sim, Sangwan; Kim, Juho; Choi, Hyunyong; Jo, Moon Ho.

In: ACS Photonics, Vol. 4, No. 3, 15.03.2017, p. 429-434.

Research output: Contribution to journalArticle

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