KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Author: search.filters.author.Kumnorkaew, PisistSubject: search.filters.subject.Organic photovoltaics

Search Results

Now showing 1 - 3 of 3
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    An unconventional blade coating for low-cost fabrication of PCDTBT: PC70BM polymer and CH3NH3PbIxCl3-x perovskite solar cells
    (2021-04-01)
    Kaewprajak, Anusit
    ;
    Kumnorkaew, Pisist
    ;
    Lohawet, Khathawut
    ;
    Duong, Binh
    ;
    Chonsut, Teantong
    A low-cost and unconventional blade coating technique, called convective deposition, has been introduced for PCDTBT:PC<inf>70</inf>BM polymer and CH<inf>3</inf>NH<inf>3</inf>PbI<inf>x</inf>Cl<inf>3-x</inf> perovskite solar cell fabrication. With the new technique, only 10–20 microliter droplets per one square inch substrate were used to deposit hole transporting material, as well as photoactive and electron transporting materials, sequentially to create a p-i-n structure solar cell. Thin film deposition and solar cell fabrication from the standard spin coating and the convective deposition were compared. Smaller and better distribution of PC<inf>70</inf>BM domain in the PCDTBT:PC<inf>70</inf>BM film was observed in the film prepared by the convective deposition. Unlike the conventional doctor-blade coating or the spin coating, the film thickness can simply be adjusted by the convective deposition speed. The highest averaged power conversion efficiency (PCE) of 6.34% was obtained from the polymer solar cell prepared by the convective deposition at the coating speed of 750 μm/s compared to 5.60% PCE from the spin coating at the speed of 2500 rpm. For perovskite solar cell, a heating stage was used during the convective deposition of perovskite ink, 10.61% PCE was achieved with the stage temperature of 70 °C and the 2500 μm/s deposition speed. Layer-by-layer deposition with the convective deposition used in this study offers benefits over the standard spin coating by reducing amount of material consumption in the fabrication process and being suitable for low-cost fabrication of other solution-based optoelectronic devices.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Pedot:Pss film preparation and characterization using convective deposition system controlled by arduino microcontroller for organic photovoltaic application
    (2021-01-01)
    Wongrerkdee, Sawitree
    ;
    Ritruksa, Mantarat
    ;
    Phattum, Saisunee
    ;
    Lohawet, Khathawut
    ;
    Kaewprajak, Anusit
    PEDOT:PSS films are prepared using convective deposition system. The convective deposition system is designed and controlled by a low-cost Arduino microcontroller. The microcontroller shows suitable potential for the system operation with good performance. Then, the system was applied to prepare PEDOT:PSS films and the prepared films are characterized. The prepared films reveal the increase in roughness and thickness for the high-velocity operation which could be occurred due to turbulent flows of PEDOT:PSS molecules. The result causes a decrease in transmittance, resistance, and water contact angle. For organic photovoltaic application, the enhanced power conversion efficiency is observed in corresponding to the increased short-circuit current density due to carrier transport efficiency improvement in organic photovoltaic devices provided by rough surfaces and thick films. The success of organic photovoltaic fabrication confirms the accepting ability of the convective deposition system controlled by Arduino microcontroller for non-vacuum thin film deposition. Thus, it should be considered as a usefulness system for thin-film based device fabrication with a low-cost operation.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Surface modification of PEDOT: PSS film by chemical vapor texturing process for enhanced organic photovoltaics
    (2020-12-01)
    Ritruksa, Mantarat
    ;
    Wongrerkdee, Sawitree
    ;
    Lohawet, Khathawut
    ;
    Kaewprajak, Anusit
    ;
    Kumnorkaew, Pisist
    Surface modification of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) film was performed using chemical vapor texturing process of HNO<inf>3</inf> vapor. Textured PEDOT:PSS film exhibits higher root-mean-square roughness of 14.43 nm than pristine PEDOT:PSS film of 11.87 nm with small decrease in thickness. Moreover, approximate one-half reduction of sheet resistance is measured. In correspondence with roughness, increasing optical transmittance in the visible region and reducing water contact angle are explored. The reduction of water contact angle implies that active layer can be deposited on the textured film with better coverage to improve interfacial contact for OPV fabricating process. This improvement facilitates charge transfer in OPV device which causes the increase of short-circuit current density (J<inf>sc</inf>) from 7.42 mA/cm<sup>2</sup> to 8.01 mA/cm<sup>2</sup>. The increased J<inf>sc</inf> is the major photovoltaic parameter in OPV enhancement. Therefore, the PEDOT:PSS film textured with the chemical vapor texturing process is demonstrated as an efficient rough film for OPV enhancement. Furthermore, the rough film modified using the process could be suggested for applying in several thin-film based devices.