Research

2D Semiconductor Optoelectronics

Two-dimensional (2D) semiconductors hold promises for electronic and optoelectronic applications due to their outstanding electrical and optical properties. Among them, semiconductor transition metal dichalcogenides, MX2 (M = Mo, W; X = S, Se), have bandgaps in the near-infrared to the visible region. Black phosphorus has bandgaps from near-infrared to the visible, depending on the layer numbers. We develop photodetectors from their van der Waals structures with high detectivity, ultrafast response speed from Mid-IR to deep-UV. The small size of the detector also enables the local spectroscopy below the diffraction limit.

D. Shen, H. Yang, C. Spudat, T. Patel. S. Zhong, F. Chen, J. Yan, X. Luo, M. Cheng, G. Sciaini, Y. P. Sun, D. A. Rhodes, T. Timusk, Y. N. Zhou, N. Y. Kim, A. W. Tsen, High-performance Mid-IR to deep-UV van der Waals photodetectors capable of local spectroscopy at room temperature, Nano Letters, 2022.

Self-Powered Electronics and Blue Energy Conversion

Harvesting energy from the environment offers many opportunities for the generation of clean power from self-sustained systems and provides great promise for ameliorating the growing threat of the global environmental issues and the energy crisis. Ambient moisture and natural water sources have attracted huge research interest in the field of energy harvesting and conversion due to easy access, good sustainability, and the ubiquity of water on Earth. We fabricate high efficient water-enabled electricity generators and create a new class of wearable sensors based on humidity-dependent-voltage generation.

  1. D. Shen, M. Xiao, G. Zou, L. Liu, W. W. Duley and Y. N. Zhou, Self-powered wearable electronics based on moisture enabled electricity generation, Advanced Materials, 2018, 1705925.

  2. D. Shen*, W. W. Duley, P. Peng, M. Xiao, J. Feng, L. Liu, G. Zou and Y. N. Zhou*, Moisture enabled electricity generation: from physics, materials to self-powered applications, Advanced Materials, 2020, 32, 2003722.

  3. D. Shen, M. Xiao, Y. Xiao, G. Zou, L. Hu, B. Zhao, L. Liu, W. W. Duley and Y. N. Zhou, Self-powered, rapid response, and highly flexible humidity sensors based on moisture-dependent voltage generation. ACS Applied Materials & Interfaces, 2019, 11, 14249-14255.

  4. Y. Xiao#, D. Shen#, G. Zou, A. Wu, L. Liu, W. W. Duley and Y. N. Zhou, Self-powered, flexible and remote-controlled breath monitor based on TiO2 nanowire networks, Nanotechnology, 2019, 30, 325503.

  5. Z. Hui, M. Xiao, D. Shen, J. Feng, P. Peng, Y. Liu, W. W. Duley and Y. N. Zhou, A self-powered nanogenerator for the electrical protection of integrated circuits from trace amounts of liquid, Nano-Micro Letters, 2020, 12, 5.

  6. J. Feng, M. Xiao, Z. Hui, D. Shen, Y. Tian, C. Hang, W. W. Duley and N. Y. Zhou, High performance magnesium carbon nanofiber hygroelectric generator based on interface-mediation enhanced capacitive discharging effect, ACS Applied Materials & Interfaces, 2020, 12, 24289–24297.

  7. X. Zhao, D. Shen*, W. W. Duley and Y. N. Zhou, Water-enabled electricity generation: a perspective, Advanced Energy and Sustainability Research. 2022, 2100196.

  8. D. Shen*, M. Xiao, X. Zhao, W. W. Duely and Y. N. Zhou*, Multifunctional self-powered electronics based on a reusable low-cost polypropylene fabric triboelectric nanogenerator, ACS Applied Materials & Interfaces, 2021, 13, 34266-34273.

Femotosecond laser nanofabrication

Femtosecond (fs) laser has strong peak power and non-linear effect, which enables ultra-precise nanofabrication. We develop ultraminiaturized high-performance graphene supercapacitors, high responsive photodetectors and low-temperature sintering capability from various new nanofabircation techniques based on fs laser, including laser direct writing, laser-induced transfer, localized laser nanojoining, and large-area nanoparticles deposition.

  1. D. Shen, G. Zou, L. Liu, W. Zhao, A. Wu, W. W. Duley and Y. N. Zhou, Scalable high-performance ultraminiature graphene micro-supercapacitors by a hybrid technique combining direct writing and controllable microdroplet transfer, ACS Applied Materials & Interfaces, 2018, 10, 5404-5412.

  2. D. Shen, G. Zou, L. Liu, A. Wu, W. W. Duley and Y. N. Zhou, Investigation of impact and spreading of molten nanosized gold droplet on solid surfaces, Applied Optics. 2018, 57. 2080-2086.

  3. D. Shen, G. Zou, L. Liu, W. W. Duley and Y. N. Zhou, Investigation of splashing phenomena during the impact of molten sub-micron gold droplets on solid surfaces, Soft Matter, 2016, 12, 295-301.

  4. J. Huo, Y. Xiao, T. Sun, G. Zou, D. Shen, B. Feng, L. Lin, W. Wang, G. Zhao and L. Liu, Femtosecond laser irradiation-mediated MoS2–metal contact engineering for high-performance field-effect transistors and photodetectors, ACS Applied Materials & Interfaces, 2021.

  5. Q.Jia, G. Zou, H. Zhang, W. Wang, H. Ren, Z. A, Z. Deng, S. Yan, D. Shen and L. Liu, Sintering mechanism of AgPd nanoalloy film for power electronic packaging, Applied Surface Science, 2021, 554, 149579.

  6. B. Feng, D. Shen, W. Wang, Z. Deng, L. Lin, H. Ren, A. Wu, G. Zou, L. Liu and Y. N. Zhou, Cooperative bilayer of lattice-disordered nanoparticles as room-temperature sinterable nanoarchitecture for device integrations, ACS Applied Materials & Interface, 2020, 11, 16972-16980. (Cover)

  7. J. Feng, M. Xiao, Z. Hui, D. Shen, Y. Tian, C. Hang, W. W. Duley and N. Y. Zhou, High performance magnesium carbon nanofiber hygroelectric generator based on interface-mediation enhanced capacitive discharging effect, ACS Applied Materials & Interfaces, 2020, 12, 24289–24297.

  8. W. Zhao, D. Shen, G. Zou, G. Zhao, H. Bai, L. Liu and Y. Zhou, Super black iron nanostructures with broadband ultralow reflectance for efficient photothermal conversion. Applied Surface Science, 2020, 521, 146383.

Copyright by Daozhi Shen