Ultrafast Hot-Carrier Photovoltaics of Type-I Monolayer Heterojunctions in the Broad Spectral Ranges
- Title
- Ultrafast Hot-Carrier Photovoltaics of Type-I Monolayer Heterojunctions in the Broad Spectral Ranges
- Author
- 심상완
- Keywords
- two-dimensional materials; photovoltaics; transition-metal dichalcogenide; hot-carrier injection; ultrafast charge transfer
- Issue Date
- 2017-02
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS PHOTONICS, v. 4, No. 3, Page. 429-434
- 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 (E-g) Bi2Te3 few-layer and a large-E-g 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 similar to 70 fs, producing interlayer charge separation. Thereby we achieve substantial conversion efficiency from a MoS2 ML with visible to infrared light illumination.
- URI
- https://pubs.acs.org/doi/abs/10.1021/acsphotonics.6b00846https://repository.hanyang.ac.kr/handle/20.500.11754/121588
- ISSN
- 2330-4022
- DOI
- 10.1021/acsphotonics.6b00846
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ELECTRICAL ENGINEERING(전자공학부) > Articles
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