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    The current state of the art in internal additive materials and quantum dots for improving efficiency and stability against humidity in perovskite solar cells
    (2022-12-01)
    Sanglee, Kanyanee
    ;
    Nukunudompanich, Methawee
    ;
    Part, Florian
    ;
    Zafiu, Christian
    ;
    Bello, Gianluca
    The remarkable optoelectronic capabilities of perovskite structures enable the achievement of astonishingly high-power conversion efficiencies on the laboratory scale. However, a critical bottleneck of perovskite solar cells is their sensitivity to the surrounding humid environment affecting drastically their long-term stability. Internal additive materials together with surface passivation, polymer-mixed perovskite, and quantum dots, have been investigated as possible strategies to enhance device stability even in unfavorable conditions. Quantum dots (QDs) in perovskite solar cells enable power conversion efficiencies to approach 20%, making such solar cells competitive to silicon-based ones. This mini-review summarized the role of such QDs in the perovskite layer, hole-transporting layer (HTL), and electron-transporting layer (ETL), demonstrating the continuous improvement of device efficiencies.
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    Characterization of Thin Diamond-Like Carbon Layer Coverage by Trace Metal Leaching Test
    (2017-01-01)
    Munpiriyakul, Pimpaporn
    ;
    Siriwongrungson, Vilailuck
    ;
    Brothers, Alan
    ;
    Supadee, Laddawan
    ;
    Waengwan, Pattamart
    A trace metal leaching test was applied to investigate coverage of a diamond-like carbon layer. Three trace metals - cobalt, nickel and iron - were measured. The change of seed and diamond-like carbon thicknesses influenced the trace metal concentration detected due to the passivation of the substrate via pinholes. Artificial pinholes were applied for a diamond-like carbon pinhole study, and it was found that the diameter, shape and total surface area of the holes affected the trace metals detected. The surface morphology and thickness were examined using scanning electron microscope and transmission electron microscope. The passivation was analyzed using electron energy loss spectroscopy.