Journal
NANO LETTERS
Volume 16, Issue 1, Pages 497-503Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04141
Keywords
Organic; transition metal dichalcogenide; gate-tunable; antiambipolar; photovoltaic
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Funding
- Materials Research Science and Engineering Center (MRSEC) of Northwestern University [NSF DMR-1121262]
- 2-DARE program [NSF EFRI-143510]
- SPIE education scholarship
- IEEE DEIS fellowship
- NSF MRSEC [DMR-1121262]
- State of Illinois
- Northwestern University
- Argonne-Northwestern Solar Energy Research (ANSER) Energy Frontier Research Center [DOE DE-SC0001059]
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The recent emergence of a wide variety of two-dimensional (2D) materials has created new opportunities for device concepts and applications. In particular, the availability of semi-conducting transition metal dichalcogenides, in addition to semimetallic graphene and insulating boron nitride, has enabled the fabrication of all 2D van der Waals heterostructure devices. Furthermore, the concept of van der Waals heterostructures has the potential to be significantly broadened beyond layered solids. For example, molecular and polymeric organic solids, whose surface atoms possess saturated bonds, are also known to interact via van der Waals forces and thus offer an alternative for scalable integration with 2D materials. Here, we demonstrate the integration of an organic small molecule p-type semiconductor, pentacene, with a 2D n-type semiconductor, MoS2. The resulting p-n heterojunction is gate-tunable and shows asymmetric control over the antiambipolar transfer characteristic. In addition, the pentacene/MoS2 heterojunction exhibits a photovoltaic effect attributable to type II band alignment, which suggests that MoS2 can function as an acceptor in hybrid solar cells.
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