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Extraordinary Sunlight Absorption and One Nanometer Thick Photovoltaics Using Two-Dimensional Monolayer Materials

Bernardi, Marco ; Palummo, Maurizia ; Grossman, Jeffrey C

Nano letters, 2013-08, Vol.13 (8), p.3664-3670 [Periódico revisado por pares]

Washington, DC: American Chemical Society

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Título:
Extraordinary Sunlight Absorption and One Nanometer Thick Photovoltaics Using Two-Dimensional Monolayer Materials
Autor: Bernardi, Marco ; Palummo, Maurizia ; Grossman, Jeffrey C
Assuntos: Applied sciences ; Condensed matter: structure, mechanical and thermal properties ; Cross-disciplinary physics: materials science; rheology ; Devices ; Electronics ; Energy ; Exact sciences and technology ; Fullerenes and related materials; diamonds, graphite ; Graphene ; Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties ; Materials science ; Molecular electronics, nanoelectronics ; Molybdenum disulfide ; Monolayers ; Nanostructure ; Natural energy ; Photovoltaic cells ; Photovoltaic conversion ; Physics ; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices ; Solar cells ; Solar cells. Photoelectrochemical cells ; Solar energy ; Specific materials ; Sunlight ; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties)
É parte de: Nano letters, 2013-08, Vol.13 (8), p.3664-3670
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: Graphene and monolayer transition metal dichalcogenides (TMDs) are promising materials for next-generation ultrathin optoelectronic devices. Although visually transparent, graphene is an excellent sunlight absorber, achieving 2.3% visible light absorbance in just 3.3 Å thickness. TMD monolayers also hold potential as sunlight absorbers, and may enable ultrathin photovoltaic (PV) devices due to their semiconducting character. In this work, we show that the three TMD monolayers MoS2, MoSe2, and WS2 can absorb up to 5–10% incident sunlight in a thickness of less than 1 nm, thus achieving 1 order of magnitude higher sunlight absorption than GaAs and Si. We further study PV devices based on just two stacked monolayers: (1) a Schottky barrier solar cell between MoS2 and graphene and (2) an excitonic solar cell based on a MoS2/WS2 bilayer. We demonstrate that such 1 nm thick active layers can attain power conversion efficiencies of up to ∼1%, corresponding to approximately 1–3 orders of magnitude higher power densities than the best existing ultrathin solar cells. Our work shows that two-dimensional monolayer materials hold yet untapped potential for solar energy absorption and conversion at the nanoscale.
Editor: Washington, DC: American Chemical Society
Idioma: Inglês

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Extraordinary Sunlight Absorption and One Nanometer Thick Photovoltaics Using Two-Dimensional Monolayer Materials

Bernardi, Marco ; Palummo, Maurizia ; Grossman, Jeffrey C

Washington, DC: American Chemical Society

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