Vacuum Deposition

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Shengzhong Liu - One of the best experts on this subject based on the ideXlab platform.

  • Highly stabilized perovskite solar cell prepared using Vacuum Deposition
    RSC Advances, 2016
    Co-Authors: Jing Zhang, Yongle Zhao, Dong Yang, Shengzhong Liu
    Abstract:

    With proper optimization, high efficiency solar cells are fabricated with the perovskite layers prepared using a one-step solution process and Vacuum Deposition method. It is found that the perovskite film prepared using the Vacuum Deposition is apparently denser with complete surface coverage, whereas the one prepared using the solution Deposition shows poorer film quality. As a result, the device made by Vacuum Deposition exhibits much better stability. After being exposed in ambient conditions for 1488 hours, the bare solar cell without encapsulation degraded by only 7% in efficiency, whereas the cell using the solution processing degraded by 30% in the first 144 hours. Moreover, it is found that the perovskite film prepared by Vacuum Deposition shows significantly better thermal stability. With the outstanding stability improvement using the Vacuum processing, it appears promising that further encapsulation may help advance the perovskite devices further into applications.

  • alternating precursor layer Deposition for highly stable perovskite films towards efficient solar cells using Vacuum Deposition
    Journal of Materials Chemistry, 2015
    Co-Authors: Dong Yang, Shengzhong Liu, Zhou Yang, Wei Qin, Yuliang Zhang
    Abstract:

    An effective technique is developed to fabricate perovskite solar cells using alternating layer-by-layer Vacuum Deposition. The average efficiency of the planar device is 15.37% with a minimal standard deviation of ±0.37% and the best efficiency as high as 16.03%. Moreover, the device shows very good stability over 62 days with very little degradation <9% when stored under ambient conditions.

V. G. Dubrovskii - One of the best experts on this subject based on the ideXlab platform.

  • diffusion controlled growth of semiconductor nanowires vapor pressure versus high Vacuum Deposition
    Surface Science, 2007
    Co-Authors: V. G. Dubrovskii, G. E. Cirlin, N V Sibirev, R A Suris, J C Harmand, V M Ustinov
    Abstract:

    Abstract Theoretical model of nanowire formation is presented, that accounts for the adatom diffusion from the sidewalls and from the substrate surface to the wire top. Exact solution for the adatom diffusion flux from the surface to the wires is analyzed in different growth regimes. It is shown theoretically that, within the range of growth conditions, the growth rate depends on wire radius R approximately as 1/ R 2 , which is principally different from the conventional 1/ R performance. The effect is verified experimentally for the MBE grown GaAs and AlGaAs wires. The dependences of wire length on the drop density, surface temperature and Deposition flux during vapor pressure Deposition and high Vacuum Deposition are analyzed and the differences between these two growth techniques are discussed.

  • Kinetic model for a spontaneous islanding during ultra-high Vacuum Deposition
    Vacuum, 1998
    Co-Authors: V. G. Dubrovskii, G. E. Cirlin, D.a. Bauman, V.v. Kozachek, V.v. Mareev
    Abstract:

    A self-consistent kinetic lattice gas model for surface morphological transformation during ultra-high Vacuum Deposition (UHVD) at submonolayer coverage is studied. The possibility for the formation of stable arrays of self-assembled nanostructures is shown. Within a range of parameters, islands have very narrow size distribution and are arranged in a periodic lattice.

Dong Yang - One of the best experts on this subject based on the ideXlab platform.

  • Highly stabilized perovskite solar cell prepared using Vacuum Deposition
    RSC Advances, 2016
    Co-Authors: Jing Zhang, Yongle Zhao, Dong Yang, Shengzhong Liu
    Abstract:

    With proper optimization, high efficiency solar cells are fabricated with the perovskite layers prepared using a one-step solution process and Vacuum Deposition method. It is found that the perovskite film prepared using the Vacuum Deposition is apparently denser with complete surface coverage, whereas the one prepared using the solution Deposition shows poorer film quality. As a result, the device made by Vacuum Deposition exhibits much better stability. After being exposed in ambient conditions for 1488 hours, the bare solar cell without encapsulation degraded by only 7% in efficiency, whereas the cell using the solution processing degraded by 30% in the first 144 hours. Moreover, it is found that the perovskite film prepared by Vacuum Deposition shows significantly better thermal stability. With the outstanding stability improvement using the Vacuum processing, it appears promising that further encapsulation may help advance the perovskite devices further into applications.

  • Stable high efficiency perovskite solar cells using Vacuum Deposition
    2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC), 2016
    Co-Authors: Dong Yang, Jing Zhang, Zhou Yang
    Abstract:

    A Vacuum Deposition process is developed to fabricate high efficiency perovskite solar cells with high stability using alternating layer-by-layer Vacuum Deposition. The power conversion efficiencies for the planer device is as high as 19.4% on rigid glass substrate and 15.1% using flexible polymeric substrate, both are the highest reported to date for their respective categories. Meanwhile, the devices shows very good stability over long term exposure in ambient with very low degradation.

  • alternating precursor layer Deposition for highly stable perovskite films towards efficient solar cells using Vacuum Deposition
    Journal of Materials Chemistry, 2015
    Co-Authors: Dong Yang, Shengzhong Liu, Zhou Yang, Wei Qin, Yuliang Zhang
    Abstract:

    An effective technique is developed to fabricate perovskite solar cells using alternating layer-by-layer Vacuum Deposition. The average efficiency of the planar device is 15.37% with a minimal standard deviation of ±0.37% and the best efficiency as high as 16.03%. Moreover, the device shows very good stability over 62 days with very little degradation <9% when stored under ambient conditions.

G. E. Cirlin - One of the best experts on this subject based on the ideXlab platform.

  • diffusion controlled growth of semiconductor nanowires vapor pressure versus high Vacuum Deposition
    Surface Science, 2007
    Co-Authors: V. G. Dubrovskii, G. E. Cirlin, N V Sibirev, R A Suris, J C Harmand, V M Ustinov
    Abstract:

    Abstract Theoretical model of nanowire formation is presented, that accounts for the adatom diffusion from the sidewalls and from the substrate surface to the wire top. Exact solution for the adatom diffusion flux from the surface to the wires is analyzed in different growth regimes. It is shown theoretically that, within the range of growth conditions, the growth rate depends on wire radius R approximately as 1/ R 2 , which is principally different from the conventional 1/ R performance. The effect is verified experimentally for the MBE grown GaAs and AlGaAs wires. The dependences of wire length on the drop density, surface temperature and Deposition flux during vapor pressure Deposition and high Vacuum Deposition are analyzed and the differences between these two growth techniques are discussed.

  • Kinetic model for a spontaneous islanding during ultra-high Vacuum Deposition
    Vacuum, 1998
    Co-Authors: V. G. Dubrovskii, G. E. Cirlin, D.a. Bauman, V.v. Kozachek, V.v. Mareev
    Abstract:

    A self-consistent kinetic lattice gas model for surface morphological transformation during ultra-high Vacuum Deposition (UHVD) at submonolayer coverage is studied. The possibility for the formation of stable arrays of self-assembled nanostructures is shown. Within a range of parameters, islands have very narrow size distribution and are arranged in a periodic lattice.

Zhou Yang - One of the best experts on this subject based on the ideXlab platform.