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Ultrafast free carrier dynamics in black phosphorus-molybdenum disulfide (BP/MoS2) heterostructure


Investigating and manipulating photocarrier dynamics in van der Waals (vdW) heterostructures with type-II band alignment have being actively carried out because of their fundamental and technological significance. Despite remarkable progresses on the ultrafast dynamics of interlayer excitons in transition metal dichalcogenides (TMDs) heterostructures, transient behaviors of free photocarriers in vdW heterostructures, a critical process governing the performance of optoelectronic devices, remain poorly understood, let alone effective manipulation. In this work, ultrafast dynamics of photo-generated free carriers in a type-II black phosphorus-molybdenum disulfide (BP/MoS2) heterostructure is studied. A remarkably reduced lifetime (~ 5 ps) of interlayer electron-hole (e-h) recombination has been found, compared with those of BP film (~ 130 ps) and other exciton-prevailed TMD heterostructures. More interestingly, this ultrafast interlayer recombination process can be well described by the Langevin model, and the large recombination rate is fundamentally linked to the high carrier mobility in BP. In addition, broadband measurements reveal that the interlayer recombination rate is insensitive to the broad energy distribution of photocarriers. Our findings provide important and complementary new insights into the fundamental photo-physics of vdW heterostructures, and represent a novel proposal for designing broadband high-speed optoelectronic devices.

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Publication details

The article was received on 23 Jan 2019, accepted on 08 Apr 2019 and first published on 08 Apr 2019

Article type: Communication
DOI: 10.1039/C9NH00045C
Citation: Nanoscale Horiz., 2019, Accepted Manuscript

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    Ultrafast free carrier dynamics in black phosphorus-molybdenum disulfide (BP/MoS2) heterostructure

    Z. Nie, Y. Wang, Z. Li, Y. Sun, S. Qin, X. Liu, I. C. E. Turcu, Y. Shi, R. Zhang, Y. Ye, Y. Xu, G. Cerullo and F. Wang, Nanoscale Horiz., 2019, Accepted Manuscript , DOI: 10.1039/C9NH00045C

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