Mutual Photoluminescence Quenching and Photovoltaic Effect in Large-Area Single-Layer MoS2-Polymer Heterojunctions
| Autor: | Hadallia Bergeron, Tejas A. Shastry, Samuel H. Amsterdam, Tobin J. Marks, Mark C. Hersam, Itamar Balla |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Photoluminescence
Materials science Band gap FOS: Physical sciences General Physics and Astronomy 02 engineering and technology Photovoltaic effect 010402 general chemistry 01 natural sciences chemistry.chemical_compound General Materials Science Absorption (electromagnetic radiation) Molybdenum disulfide chemistry.chemical_classification Quenching Condensed Matter - Materials Science business.industry General Engineering Materials Science (cond-mat.mtrl-sci) Heterojunction Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Optoelectronics 0210 nano-technology business |
| Popis: | Two-dimensional transition metal dichalcogenides (TMDCs) have recently attracted attention due to their superlative optical and electronic properties. In particular, their extraordinary optical absorption and semiconducting band gap have enabled demonstrations of photovoltaic response from heterostructures composed of TMDCs and other organic or inorganic materials. However, these early studies were limited to devices at the micrometer scale and/or failed to exploit the unique optical absorption properties of single-layer TMDCs. Here we present an experimental realization of a large-area type-II photovoltaic heterojunction using single-layer molybdenum disulfide (MoS2) as the primary absorber, by coupling it to the organic {\pi}-donor polymer PTB7. This TMDC-polymer heterojunction exhibits photoluminescence intensity that is tunable as a function of the thickness of the polymer layer, ultimately enabling complete quenching of the TMDC photoluminescence. The strong optical absorption in the TMDC-polymer heterojunction produces an internal quantum efficiency exceeding 40% for an overall cell thickness of less than 20 nm, resulting in exceptional current density per absorbing thickness in comparison to other organic and inorganic solar cells. Furthermore, this work provides new insight into the recombination processes in type-II TMDC-polymer heterojunctions and thus provides quantitative guidance to ongoing efforts to realize efficient TMDC-based solar cells. Comment: 24 pages, 6 figures |
| Databáze: | OpenAIRE |
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