000197323 001__ 197323
000197323 005__ 20190416220314.0
000197323 0247_ $$2doi$$a10.1021/nn500480u
000197323 022__ $$a1936-086X
000197323 02470 $$2ISI$$a000333539400124
000197323 037__ $$aARTICLE
000197323 245__ $$aLight Generation and Harvesting in a van der Waals Heterostructure
000197323 269__ $$a2014
000197323 260__ $$bAmer Chemical Soc$$c2014$$aWashington
000197323 300__ $$a7
000197323 336__ $$aJournal Articles
000197323 520__ $$aTwo-dimensional (2D) materials are a new type of materials under intense study because of their interesting physical properties and wide range of potential applications from nanoelectronics to sensing and photonics. Monolayers of semiconducting transition metal dichalcogenides MoS2 or WSe2 have been proposed as promising channel materials for field-effect transistors. Their high mechanical flexibility, stability, and quality coupled with potentially inexpensive production methods offer potential advantages compared to organic and crystalline bulk semiconductors. Due to quantum mechanical confinement, the band gap in monolayer MoS2 is direct in nature, leading to a strong interaction with light that can be exploited for building phototransistors and ultrasensitive photodetectors. Here, we report on the realization of light-emitting diodes based on vertical heterojunctions composed of n-type monolayer MoS2 and p-type silicon. Careful interface engineering allows us to realize diodes showing rectification and light emission from the entire surface of the heterojunction. Electroluminescence spectra show clear signs of direct excitons related to the optical transitions between the conduction and valence bands. Our p-n diodes can also operate as solar cells, with typical external quantum efficiency exceeding 4%. Our work opens up the way to more sophisticated optoelectronic devices such as lasers and heterostructure solar cells based on hybrids of 2D semiconductors and silicon.
000197323 6531_ $$atwo-dimensional materials
000197323 6531_ $$adichalcogenides
000197323 6531_ $$aMoS2
000197323 6531_ $$aheterostructures
000197323 6531_ $$ap-n junctions
000197323 6531_ $$ananophotonics
000197323 6531_ $$asolar cells
000197323 700__ $$aLopez-Sanchez, Oriol
000197323 700__ $$0244167$$g206703$$aAlarcon Llado, Esther
000197323 700__ $$0245839$$g214827$$aKoman, Volodymyr
000197323 700__ $$0243742$$g182447$$aFontcuberta I. Morral, Anna
000197323 700__ $$aRadenovic, Aleksandra$$g161458$$0240208
000197323 700__ $$aKis, Andras$$g133331$$0240306
000197323 773__ $$j8$$tACS Nano$$q3042-3048
000197323 8564_ $$uhttps://infoscience.epfl.ch/record/197323/files/ACS%20Nano%20%282014%29%20Lopez-Sanchez%20-%20Light%20Generation%20and%20Harvesting%20in%20a%20van%20der%20Waals%20Heterostructure.pdf$$zPostprint$$s2135141$$yPostprint
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000197323 909CO $$qGLOBAL_SET$$pSTI$$particle$$ooai:infoscience.tind.io:197323
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000197323 937__ $$aEPFL-ARTICLE-197323
000197323 973__ $$rNON-REVIEWED$$sPUBLISHED$$aEPFL
000197323 980__ $$aARTICLE