Hot carrier-enhanced interlayer electron–hole pair multiplication in 2D semiconductor heterostructure photocells

ORAL

Abstract

Two-dimensional heterostructures composed of atomically thin transition metal dichalcogenides (TMDs) provide an excellent opportunity to study electron–hole (e–h) pair multiplication. Here, we report the highly efficient multiplication of interlayer e–h pairs in 2D semiconductor heterostructure photocells composed of 2L-WSe2 and 1L-MoSe2. The carrier multiplication process, which is made more efficient through hot carrier transfer at the interface between WSe2 and MoSe2, can be utilized to significantly increase the photoresponse in these TMD heterojunction photocells. By exploiting this highly efficient interlayer e–h pair multiplication process, we demonstrate near-infrared optoelectronic devices that exhibit 350% enhancement of the optoelectronic responsivity at microwatt power levels. Our findings, which demonstrate efficient carrier multiplication in TMD-based optoelectronic devices, make 2D semiconductor heterostructures viable for a new class of ultra-efficient photodetectors based on layer-indirect e–h excitations.

*Air Force Office of Scientific Research, Biosystems Directorate
National Science Foundation Division of Materials Research CAREER
SHINES, an Energy Frontier Research Center funded by the US Department of Energy

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Presenters

  • Fatemeh Barati

    • Physics & Astronomy, Univ of California - Riverside
    • Univ of California - Riverside

Authors

  • Fatemeh Barati

    • Physics & Astronomy, Univ of California - Riverside
    • Univ of California - Riverside

  • Maxwell Grossnickle

    • Physics, Univ of California - Riverside
    • Physics & Astronomy, Univ of California - Riverside

  • Shanshan Su

    • University of Califoria Riverside
    • Electrical and computer Science engineering, University of California Riverside
    • Department of Electrical and Computer Engineering, Univ of California - Riverside

  • Roger Lake

    • Electrical and computer Engineering, Univ of California - Riverside
    • Department of Electrical and Computer Engineering, University of California, Riverside
    • University of California, Riverside
    • Univ of California - Riverside
    • Electrical and Computer Engineering, University of California, Riverside
    • University of Califoria Riverside
    • University of California Riverside
    • Department of Electrical and Computer Engineering, Univ of California - Riverside
    • Electrical and Computer Engineering, University of California Riverside

  • Vivek Aji

    • Physics & Astronomy, Univ of California - Riverside
    • Department of Physics and Astronomy, Univ of California - Riverside
    • Univ of California - Riverside
    • Physics and Astronomy, University of California Riverside

  • Nathaniel Gabor

    • Physics, Univ of California - Riverside
    • Physics & Astronomy, Univ of California - Riverside
    • Department of Physics and Astronomy, Univ of California - Riverside
    • Univ of California - Riverside
    • Physics and Astronomy, University of California Riverside
    • Physics, University of California Riverside