Yindeesuk, Witoon

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Preferred name
Yindeesuk, Witoon
Alternative Name
Yindeesuk, W.
Main Affiliation
Email
witoon.yi@kmitl.ac.th

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    Item type:Publication,
    The Effect of PbS Colloidal Quantum Dots with CdS and ZnS Coating on Photovoltaic Properties
    (2023-01-01)
    Wichaiyo, Napasuda
    ;
    Kitiwan, Mettaya
    ;
    Shen, Qing
    ;
    Yindeesuk, Witoon
    In this research, we used the co-precipitation method to fabricate lead sulfide colloidal quantum dots (PbS CQDs) for photovoltaic cells. PbS CQDs were deposited uniformly on a titanium dioxide electrode by the dip-coating method. Photoelectrodes were prepared by coating layers using the successive ionic layer adsorption and reaction (SILAR) method. A solar simulation was used to investigate the photovoltaic properties of photoelectrodes under one sun illumination (100 mW/cm<sup>2</sup>) at room temperature (AM 1.5 G). The photovoltaic measurements demonstrated that TiO<inf>2</inf>/PbS CQDs with CdS and ZnS coating electrodes had a maximum power conversion efficiency (PCE) of 1.01 %. The crystallite size of PbS CQDs with different coating layers was analyzed using X-ray diffraction (XRD), and the crystallite size range was 6-7 nm. The existence of PbS CQDs and coating layers on the TiO<inf>2</inf> electrodes was confirmed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). UV-visible spectroscopy was used to obtain the optical properties of the photoelectrodes. The optical band gap was 0.72-0.75 eV.