Japan, such as the development of the East LED lamp disaster area

Research group of University of Tokyo in Japan for advanced science and technology research center Professor Segawa Koji and its partners in dye-sensitized solar cell (DSSC:dye-sensitized solar cELl), led and NiMH rechargeable batteries, making 100 lanterns portable lamps, and from May 2011 onwards in two locations in the East Japan earthquake distribution. "DSSC production in Japan, and play a role in the community for the first time" (Uchida So, associate professor of East China).

The portable lamp is made of the Seto Sichuan chamber cooperative research manufacturer developed palm size dye-sensitized solar panels, light emitting part can light pressed by hands of commercially available LED lamp and the battery (Figure 1) the combination made. Batteries use 5 nickel metal hydride rechargeable batteries. The battery does not need to be replaced, only the sun during the day, the pigment can be filled with solar cells can be filled, can make LED continuous lighting for about 20 hours".

100 lamps were made within 1 months after the earthquake

In the northeast of Japan, the members of the Sichuan research laboratory in the field, just after the earthquake in March 14, 2011, the Sichuan Province on the proposed can not be used to increase the sensitivity of solar cells for the disaster area to do something. Co manufacturers also responded positively, then began the development of portable lights. Portable lamp made in 1 months time, 100, in May 3rd to the disaster area for free use.

Issued a portable light location is two shelters for tsunami disaster serious Sendai city in Miyagi Prefecture ISHINOMAKI and Wakabayashi district. Each place is 50. "The location of the release is a refuge of about 200 people, taking into account the use of the use of the maintenance, through on-site inspection, the choice of the place of traffic" (in the field).

Until the release, the heart of the field are worried that this lamp can be of great use". But this is unfounded, portable lamps bring to the local people's joy greatly exceeded the expected in the field.

At the time of the release, because the shelters are mostly school gym, so night lighting has been a headache for victims. If you don't open ceiling lighting, indoor dark suffering, but it will turn on the lights, a brightly lit, woke the sleeping people have. In the evening, when someone goes to the toilet, the ceiling light is turned on. Moreover, because the toilet is temporarily set aside outside the sanctuary, stepping out of the sanctuary is dark. We can only go to the dark. There's no light in the bathroom.

With a portable light, these problems solved. The lighting of the ceiling in the shelter can no longer be switched frequently, and lights are lit up in the passage to the toilet and the toilet (Figure 2, figure 3, figure 4). This is really happy for the victims. "As a kind of daily necessities, the victims have been chosen to take charge of the daily management and charge of the day".

As if the forest sanctuary closed in early July, Uchida et al the recovery of portable lamps issued. From the distribution to the recovery, the use of time is about 2 months. The city of stone and the sanctuary is still using this small lamp.

The utility model has the advantages of a pigment sensitization solar cell

The reason for the use of solar cells solar cell, the first reason is because this battery is a research subject of the Sichuan research laboratory, but also technically more suitable for this purpose. Specifically, (1) dye-sensitized solar cell is different from many other solar cells, the output voltage is not easily affected by changes in the amount of light, (2) because of the change of output voltage is small, so without the boost circuit when charging the battery, it can simplify the circuit design.

In general, such as the use of silicon solar cell semiconductor pn junction in the glare of the light weight, high density electron and other charged particles, making the efficiency increase, therefore is also used to set the light type solar cell. On the other hand, in the light irradiation, because the output voltage itself, if there is no charge pump booster circuit, the power will be difficult to use.

In contrast, the output voltage of a dye sensitized solar cell is less dependent on the amount of light that can be produced even on cloudy days. The portable lamp does not use the boost circuit, but only after the use of a light switch to start charging a simple circuit. "Even if it is cloudy, as long as the day has been charging, electricity is enough to use a night" (Sichuan).

Had plagued the dye-sensitized solar cell project solution is also taking shape. One of them is durability. Pigment sensitized solar cells are prone to leakage, which is fatal to the durability of solar cells. But recently, the emergence of a lot of products of high durability, durability accelerated tests, some of which may even in outdoor use for more than 15 years. "This small lamp is also durable, in the use of the disaster area within 2 months, the pigment sensitized solar cells are completely no fault" (Sichuan). There are 2 parts of the LED fault.

Another issue is the conversion efficiency. For pigment sensitized solar cells, the conversion efficiency of the micro unit is as high as 12%. But with a certain area of the module conversion efficiency has been very low, 1 ~ 2% or even lower case is also a lot of. However, the use of small lamps DSSC conversion efficiency of the battery board, although not detailed determination, but there should be 5 ~ 8%".

In addition, the laboratory has recently developed a new pigment, the pigment