Young-Wook Jang

Synthesis, Characterization, and Photovoltaic Properties of Soluble TiOPc Derivatives

We have synthesized soluble TiOPc derivatives containing alkoxy groups for use as additives in dye-sensitized solar cells (DSSCs). The DSSC devices containing these TiOPc derivatives exhibited short-circuit current densities of 8.49~10.04 mA/cm2 and power conversion efficiencies of 2.73~3.62 % under AM 1.5 illumination and 100 mW/cm2 irradiation.

Preparations and Characterizations of TiO2 Pastes for Flexible Dye-Sensitized Solar Cells

New TiO2 pastes for the fabrication of TiO2 electrodes at low temperature were prepared from a TiO2 nanoparticle colloidal solution including Ti-alkoxide precursors. In addition, TiO2 pastes comprising 123 nm and 200 nm TiO2 particles used as scattering particles were prepared. Single and double layered TiO2 electrodes were deposited onto an ITO-PEN film by the doctor-blade method and subsequently sintered at 140°C and used to fabricate flexible Dye-sensitized Solar Cells (DSSCs). Due to the light scattering effect in the double layered TiO2 electrode, the Jsc and efficiency of the flexible DSSCs were greatly enhanced.

Photovoltaic Properties of Dye-Sensitized Solar Cells using Metallophthalocyanines with Poly(ethylene glycol) Electrolytes

Dye-sensitized solar cells (DSSCs) were prepared with a poly(ethylene glycol) (PEG) electrolyte using various metallophthalocyanines (MPcs) as an additive. The DSSC device using MPcs has higher power conversion efficiency than that without MPcs, due to decrease of electron transfer distance by the interface adsorption between TiO2 film and PEG electrolyte. The best result on power conversion efficiency was 4.18% in DSSC device using InOHPc. The open-circuit voltage (Voc) was 0.70 V, the short-circuit current density (Jsc) was 10.20 mA/cm2, and the Fill Factor (FF) was 0.58. The addition of MPcs as an additive is useful to improve the performances of DSSC devices such as Voc, Jsc, and power conversion efficiency.

Dye-Sensitized Solar Cells, Using the Poly(ethylene glycol) Electrolyte Based on 5,10,15,20-tetrakis(p-toyl)porphyrin Metal Complexes as the Additive

This study focuses on the syntheses of zinc 5,10,15,20-tetrakis(p-tolyl)porphyrin (ZnTTP), silicon dichloride 5,10,15,20-tetrakis(p-tolyl)porphyrin (SiCl2TTP), and oxotitanium(IV) 5,10,15,20-tetrakis(p-tolyl)porphyrin (TiOTTP) and their photovoltaic properties as additives for use in electrolytes of the DSSC. In order to investigate photovoltaic effects of the DSSC devices, the FTO/TiO2/N3 Dye/Electrolyte/Pt device was fabricated by using poly (ethylene glycol) (PEG) electrolytes based on TTP metal complexes as an additive. When TiOTTP was introduced into the PEG electrolyte, the power conversion efficiency of DSSC device was shown remarkably a high value compared with values of the others.

Dye-sensitized solar cells based on poly(ethylene glycol) electrolyte containing oxotitanium(IV) 5,10,15,20-tetrakis(p-toyl)porphyrin

We have focused on the synthesis and photovoltaic properties of oxotitanium(IV) 5,10,15,20-tetrakis(p-toyl) porphyrin (TiO-TTP) as an additive in the dye-sensitized solar cell (DSSC). The chemical structure of TiO-TTP synthesized was characterized by FT-IR and 1H-NMR spectroscopy. We have prepared the DSSC device, using N3 dye as a photosensitizer, sandwiched with a TiO 2 -deposited electrode and a Pt-coated electrode as two electrodes. In order to investigate the photovoltaic effects of the DSSC devices, the FTO/TiO 2 /Dye/Electrolyte/Pt device was fabricated by using the poly(ethylene glycol) (PEG) electrolyte based on TiO-TTP as the additive. The photovoltaic performances of the DSSC devices were measured by solar simulator under 100 mW/cm2 at AM 1.5. The J sc is 7.75 mA/cm2 and the V OC is 0.76 V and the FF is 0.62, leading to a calculated power conversion efficiency of 3.60 %. When TiO-TTP was introduced into the PEG electrolyte, the η of DSSC device was shown remarkably a high value compared with the value of that without TiO-TTP or metal free TTP. This result was caused by the adsorption on the interface between nanocrystalline porous TiO 2 films and PEG electrolyte by TiO center of TiO-TTP.