There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Dye-sensitized solar cells (DSCs) offer the possibilities to design solar cells with a large flexibility in shape, color, and transparency. DSC research groups have been established around the worl ...

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Dye-Sensitized Solar Cells

Today's best perovskite solar cells use a mixture of formamidinium and methylammonium as the monovalent cations. With the addition of inorganic cesium, the resulting triple cation perovskite compositions are thermally more stable, contain less phase impurities and are less sensitive to processing conditions. This enables more reproducible device performances to reach a stabilized power output of 21.1% and ∼18% after 250 hours under operational conditions. These properties are key for the industrialization of perovskite photovoltaics.

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Cesium-containing triple cation perovskite solar cells: improved stability, reproducibility and high efficiency

The quality of human life depends to a large degree on the availability of energy. This is threatened unless renewable energy resources can be developed in the near future. Chemistry is expected to make important contributions to identify environmentally friendly solutions of the energy problem. One attractive strategy discussed in this Forum Article is the development of solar cells that are based on the sensitization of mesoscopic oxide films by dyes or quantum dots. These systems have already reached conversion efficiencies exceeding 11%. The underlying fundamental processes of light harvesting by the sensitizer, heterogeneous electron transfer from the electronically excited chromophore into the conduction band of the semiconductor oxide, and percolative migration of the injected electrons through the mesoporous film to the collector electrode will be described below in detail. A number of research topics will also be discussed, and the examples for the first outdoor application of such solar cells wi...

Solar energy conversion by dye-sensitized photovoltaic cells

Fabrication and photovoltaic performances for flexible transparent conductive oxide-less (TCO-less) flat and cylinder dye-sensitized solar cells (DSCs) are reported. The cylinder solar cell consists of a porous silicone tube, a protected stainless steel metal mesh (protected SUS mesh) working as a counter electrode, a gel electrolyte sheet, a dye/porous titania layer fabricated on a protected SUS mesh working as a anode, and a thermally shrinkable plastic tube, from the inside to the outside. The thermally shrinkable tube was used to reduce the gap between a cathode and an anode. In addition, a porous silicone tube was used for injecting electrolytes smoothly into the gel electrolyte layer. 5.08% efficiency (FF: 0.68; Voc: 0.68 V; Jsc: 11.07  mA/cm 2 ) was observed. A flexible TCO-less flat DSCs with 6.1% efficiency which was improved by narrowing a gap between two electrodes is also reported.

Flexible transparent conductive oxide-less flat and cylinder dye-sensitized solar cells

Flexible metal wires were used to fabricate transparent conductive oxide (TCO)-less cylindrical dye-sensitized solar cells (DSSCs) with a very easy and fast fabrication process. The nature of the wire and interfacial contact between the metal wire and nanoporous TiO2 layer affected the charge transport giving the photoconversion efficiency of 3.88%.

Fabrication and characterization of coil type transparent conductive oxide-less cylindrical dye-sensitized solar cells

Dye-sensitized solar cells consisting of tandem and hybrid structures are reported. It was proved that these new structures have a potential to harvest light with wide range of wavelength and increase open circuit voltage. In addition, modification of charge separation interfaces with organic molecules and dyes are discussed in terms of trap passivations which bring about high efficiency.

High efficiency 3D dye sensitized solar cells and the nano-surface control

A method for manufacturing a dye-sensitized solar cell provided with a working electrode, a counter-electrode installed so as to face the working electrode, and an electrolytic solution charged between the working electrode and the counter-electrode, wherein a step for forming a metal oxide porous layer constituting the working electrode is provided with: a first step for applying a paste containing metal oxide microparticles onto a substrate and forming a coating layer; a second layer for firing the coating layer at a temperature of 250°C to 400°C; a third step for irradiating the coating layer with UV light in an atmosphere containing oxygen; and a fourth step for re-firing the coating layer at a temperature of 250°C to 400°C

Method for manufacturing dye-sensitized solar cell, and dye-sensitized solar cell

reached 11.0%, which is almost same as that of amorphous silicon type solar cells. However, the efficiency is not as high as 20-25 % of crystal silicon type solar cells. Therefore, researches to find photo-conversion systems in the area of near infrared and infrared regions are being done to increase the efficiency. It has been reported that the efficiency of DSCs is affected by dye-adsorption behaviors on titania surfaces. However, there was no report on how dyes are adsorbed on titania and the relationship between dye adsorption and solar cell efficiency. We now report the adsorption behavior of dye molecules, which are monitored by Quartz Crystal Microbalance (QCM), and discuss the role of dye aggregation inhibitors which affect seriously the solar cell efficiency. 2. Observation of dye adsorption feature by QCM: Q-sense E1 Quartz Crystal Microbalance with Dissipation monitoring (QCM-D) was used for observing the dye adsorption behavior. The apparatus was developed for monitoring adsorptions of biomaterials, initially. We applied this to monitoring of the dye adsorption. A TiO

Shuzi Hayase

Papers

Flexible transparent conductive oxide-less flat and cylinder dye-sensitized solar cells

Fabrication and characterization of coil type transparent conductive oxide-less cylindrical dye-sensitized solar cells

High efficiency 3D dye sensitized solar cells and the nano-surface control

Method for manufacturing dye-sensitized solar cell, and dye-sensitized solar cell

Dye adsorption feature on titania surface and role of dye aggregation inhibitor monitored by quartz crystal microbalance (QCM)