Photoresponse of Natural van der Waals Heterostructures
- San Francisco State Univ., CA (United States)
- Univ. of Oklahoma, Norman, OK (United States)
- Stanford Univ., CA (United States)
Van der Waals heterostructures consisting of two-dimensional materials offer a platform to obtain materials by design and are very attractive owing to unique electronic states. Research on 2D van der Waals heterostructures (vdWH) has so far been focused on fabricating individually stacked atomically thin unary or binary crystals. Such systems include graphene, hexagonal boron nitride, and members of the transition metal dichalcogenide family. In this paper, we present our experimental study of the optoelectronic properties of a naturally occurring vdWH, known as franckeite, which is a complex layered crystal composed of lead, tin, antimony, iron, and sulfur. We present here that thin film franckeite (60 nm < d < 100 nm) behaves as a narrow band gap semiconductor demonstrating a wide-band photoresponse. We have observed the band-edge transition at ~1500 nm (~830 meV) and high external quantum efficiency (EQE ≈ 3%) at room temperature. Laser-power-resolved and temperature-resolved photocurrent measurements reveal that the photocarrier generation and recombination are dominated by continuously distributed trap states within the band gap. To understand wavelength-resolved photocurrent, we also calculated the optical absorption properties via density functional theory. Finally, we have shown that the device has a fast photoresponse with a rise time as fast as ~1 ms. Finally, our study provides a fundamental understanding of the optoelectronic behavior in a complex naturally occurring vdWH, and may pave an avenue toward developing nanoscale optoelectronic devices with tailored properties.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- OSTI ID:
- 1487448
- Journal Information:
- ACS Nano, Vol. 11, Issue 6; ISSN 1936-0851
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Novel structured transition metal dichalcogenide nanosheets
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journal | January 2018 |
Simultaneous assembly of van der Waals heterostructures into multiple nanodevices
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journal | January 2018 |
Mechanical and liquid phase exfoliation of cylindrite: a natural van der Waals superlattice with intrinsic magnetic interactions
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journal | May 2019 |
Superlattices based on van der Waals 2D materials
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journal | January 2019 |
Simultaneous Assembly of van der Waals Heterostructures into Multiple Nanodevices | text | January 2018 |
Optical contrast and refractive index of natural van der Waals heterostructure nanosheets of franckeite | text | January 2018 |
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