British scientists have developed a smart way to deliver affordable solar energy to poor people living outside the grid in developing countries.

Eight19, from the Cavendish Laboratory at Cambridge University, uses organic technology based on printed plastics to develop solar cells. These batteries are particularly suitable for powering small lamps and mobile phone chargers.

Printed plastic solar cell technology is based on the use of a large number of available and low-cost organic semiconductors. They have a strong light absorption capacity (100 times that of silicon), the absorption spectrum can be tuned by chemical compounds, and they precipitate in a dissolved environment, resulting in a light-weight ultra-thin solar absorber, making it an application with many other (Including large-scale power generation) and very promising materials.

Today, researchers combine solar energy with mobile phone service payment technology to create a "recharge" solar service that avoids the high cost of initial installation of ordinary solar installations. With the support of the charity Solar Aid, this technology is being tested in Kenya.

There are more than 1.6 billion people in the world without access to grid power, and the cost of kerosene lighting that many people rely on is relatively high. For example, a typical Kenyan family spends about $ 10 per month on lighting alone, which is 1,000 times the amount spent in Western countries. At the same time, the use of kerosene lighting is still very dangerous, causing many deaths every year.

This new system, called IndiGo, allows users to get lighting at a lower cost and in a safer way, and can also charge their mobile phones with a calling card.

In addition, it avoids the health problems caused by carbon dioxide emissions and the burning of kerosene. Although solar lights and mobile phone chargers are nothing new, their initial cost has prevented them from being popular among many potential users.

The new system includes a low-cost solar panel, a battery pack with a built-in mobile phone charger, and a high-efficiency LED light. The user uses the mobile phone card password to recharge the IndiGo device, and the mobile phone card password is verified by SMS using an ordinary mobile phone.

Related user trials started in Kenya in September 2011 and expanded to Zambia, Malawi and the South Asian subcontinent, and were fully put into production and commercialization in early 2012.

Solar Aid CEO Steve Andrews said: "Solar provides the world's poorest people, lighting and mobile phone charging with huge economic, health and social benefits. New technologies open these benefits to many people. This is a major breakthrough. "

Simon Bransfield-Garth, who is responsible for this development, said: "All renewable energy, including wind, solar or tidal energy, has a problem of high initial investment. Through a service to provide solar energy, users can directly use fossils. Fuel transition to low-cost, high-efficiency solar energy. "

Samuel Kimani from Kenya Mwiki installed the system at home. He said: "Now I am very happy because this new system replaces our kerosene lighting. The quality of the kerosene lighting is particularly poor and it will cause a lot of air pollution. I am very happy because I can now charge at my own home. "Currently, mobile phone users in Kenya often have to go a long way to charge their mobile phones.

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