Sung-Il Jang

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.

Photovoltaic Properties of Dye-Sensitized Solar Cells Using Glycerol-Modified PEDOT:PSS

In this study, we fabricated Dye-Sensitized Solar Cell (DSSC) device using poly(3,4-ethylenedioxythiophene):poly(styrenesulphonic acid) (PEDOT:PSS) or glycerol-modified PEDOT:PSS (G-PEDOT:PSS) as hole conducting materials. In SnO2:F/TiO2/Dye/PEDOT:PSS (or G-PEDOT:PSS)/Pt device system, in order to increase the ionic conductivity, the addition of ionic liquid into PEDOT:PSS solution resulted in the increase of power conversion efficiency of devices. We investigated photovoltaic characteristics of three type devices of SnO2:F/TiO2/Dye/G-PEDOT:PSS/Pt system according to glycerol concentration in PEDOT:PSS. The SnO2:F/TiO2/Dye/G-PEDOT:PSS/Pt device with 6 wt% glycerol in PEDOT:PSS showed the best result on 2.62% of the power conversion efficiency. The open-circuit voltage (Voc) of this device was 0.82 V, the short-circuit current density (Jsc) was 5.48 mA/cm2, and fill factor (FF) was 0.59.

Effect of Etched Substrates in Long-Term Stability Testing of Dye-Sensitized Solar Cells

The dye-sensitized solar cells (DSSCs) examine long-term stability tests were prepared to SnO2:F (FTO) glass substrates patterned by the etching method were applied to the electrode on the device using polyethyleneglycol (PEG) electrolyte. We investigated the effect of patterned SnO2:F (FTO) glass substrates on the power conversion efficiency and long-term stability of DSSCs. The patterned devices maintained over 83% of its initial overall power conversion efficiency after 720 hours aging at room temperature, while the devices using non-patterned FTO glass substrates showed drastic decrease in performances.

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.