• Journal of Powder Materials
• /
• v.12 no.1
• /
• pp.7-16
• /
• 2005

Dye-sensitized solar cells(DSSCs) have been under investigation for the past decade due to their attractive features such as high energy conversion efficiency and low production costs. The basis for energy conversion in the injection of electrons from a photoexcited stateof a dye sensitizer into the conduction band of the nanocrystalline $TiO_2$ semiconductor upon absorption of light. It is believed that the DSSC is one of the most promising technologies to solve the significant energy problems. In this article, the development trends and perspective of DSSCs were reviewed.

• Journal of Ceramic Processing Research
• /
• v.23 no.2
• /
• pp.199-207
• /
• 2022

A rapid cooling (quenching) step has been introduced in fabrication of TiO₂ photoelectrodes for dye-sensitized solar cells (DSSCs). The quenching process, studied at a fixed sintering temperature, decreased particle size but increased surface roughness without any substantial change in the crystal structure or oxidation state of TiO₂ films. Therefore, the change in the DSSC performance induced by the quenching was related closely to the microstructural and morphological changes in the TiO₂ films. Smaller particle size and the rough surface of TiO₂ films facilitated dye adsorption and increased the number of active reaction sites. In particular, the enlarged number of active reaction sites produced by the quenching process promoted the charge transfer reaction at the TiO₂-dye-electrolyte interface, resulting in overall performance improvement of DSSCs. The conversion efficiency of the furnace cooled- and quenched-TiO₂ films at 500 ℃ were 4.588% and 5.797%, respectively.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2013.08a
• /
• pp.310.2-310.2
• /
• 2013

For enhancement of dye-sensitized solar cell performance, TiO2 blocking layer has been used to prevent recombination between electron and hole at the conducting oxide and electrolyte interface. In solid state dye-sensitized solar cells, it is necessary to fabricate pin-hole free TiO2 blocking layer. In this work, we deposited the TiO2 blocking layer on conducting oxide by atomic layer deposition and compared the efficiency. To compare the efficiency, we fabricate solid state dye-sensitized solar cell with using CuSCN as hole transport material. We see the efficiency improve with 40nm TiO2 blocking layer and the TiO2 blocking layer morphology was characterized by SEM. Also, we used this blocking layer in TiO2/Sb2S3/ CuSCN solar cell.

• 한국신재생에너지학회:학술대회논문집
• /
• 2007.11a
• /
• pp.323-323
• /
• 2007

• 한국신재생에너지학회:학술대회논문집
• /
• 2008.05a
• /
• pp.444-444
• /
• 2008

• 한국신재생에너지학회:학술대회논문집
• /
• 2007.06a
• /
• pp.244-244
• /
• 2007

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.28 no.3
• /
• pp.175-179
• /
• 2015

In this study, we propose Ti hole pattern structure on the transparent conductive oxide (TCO) less dye-sensitized solar cells (DSSCs) using the lift-off process to improve the low light transmittance and low efficiency caused by opaque Ti electrode. The formation of Ti hole patterns make it possible to move the dye adsorption and electrolyte. The DSSCs with Ti hole patterns showed a higher photoelectric conversion efficiency (PCE) than those with general structure by 11.1%. As a result, The Ti hole pattern structure can be improved to increase the light absorption of the dyes and PCE of the TCO-less DSSCs is also increased.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2014.02a
• /
• pp.483.2-483.2
• /
• 2014

In this study, we describe a simple selective etching method that produces noncurling, freestanding, large-area, aligned $TiO_2$ nanotube (NT) with doubly ends opened. The novel selective etching process only removed the thin 2nd bottom layer from the physically and chemically stable thick amorphous 1st top layer under thermal treatment at $250^{\circ}C$, yielding ordered doubly open-ended NT (DNT) that could be easily transferred to an FTO substrate for the fabrication of front-illuminated dye sensitized solar cells (DSCs). The DNT-DSCs yielded a higher PCE (8.6%) than was observed from $TiO_2$ nanoparticle (TNP)-based DSCs (7.3%), for comparable film thicknesses of $16{\mu}m$, despite of 20% decreased amount of dye. Intensity-modulated photocurrent and photovoltage spectroscopy (IMPS and IMVS, respectively) revealed that the DNT-DSCs exhibited electron lifetimes that were 10 times longer than those of TNP-DSCs, which contributed to high device performances.

• Transactions on Electrical and Electronic Materials
• /
• v.14 no.2
• /
• pp.86-89
• /
• 2013

Dye-sensitized solar cells have a FTO/$TiO_2$/Dye/Electrode/Pt counter electrode structure, yet more than a 10% electron loss occurs at each interface. A passivating layer between the $TiO_2$/FTO glass interface can prevent this loss of electrons. In theory, ZnO has excellent electron collecting capabilities and a 3.4 eV band gap, which suppresses electron mobility. FTO glass was coated with ZnO thin films by RF-magnetron sputtering; each film was deposited under different $O_2$:Ar ratios and RF-gun power. The optical transmittance of the ZnO thin film depends on the thickness and morphology of ZnO. The conversion efficiency was measured with the maximum value of 5.22% at an Ar:$O_2$ ratio of 1:1 and RF-gun power of 80 W, due to effective prevention of the electron recombination into electrolytes.

• Journal of Electrochemical Science and Technology
• /
• v.10 no.2
• /
• pp.214-222
• /
• 2019

Dye-sensitized solar cells (DSSCs) have been receiving growing attentions as a potential alternative to order photovoltaic devices due to their high efficiency and low manufacturing cost. DSSCs are composed of a photosensitizing dye adsorbed on a mesoporous film of nanocrystalline $TiO_2$ as a photoelectrode, an electrolyte containing triiodide/iodide redox couple, and a platinized counter electrode. To improve photovoltaic properties of DSSCs, new dicationic salts based on ionic liquids were synthesized. Quite comparable efficiencies were obtained from electrolytes with new dicationic iodide salts. The best cell performance of 7.96% was obtained with dicationic salt of PBDMIDI.