Northwestern University Found That Organic Thin Film Solar Cells Will Be More Efficient To 5.6% Of The New Method

Chicago's Northwestern University research group that does not change in the organic thin film solar cell structure of the semiconductor layer under the premise of a coating only positive, then module conversion efficiency from 3 to 4 percent to 5.2 ~ 5.6% . The National Bureau Huayuanyuankan Proceedings of the National Academy of Sciences published in the online edition of the paper.

Organic thin film solar cells use, and organic EL through with the same structure of the organic semiconductor solar achieve. Northwestern University has previously developed from the cathode to the anode by ITO/P3HT: PCBM F / Al structure of the solar cell. PCBM for n-type fullerene (C612) derivatives, P3HT for p-type organic semiconductors.

Northwestern University's use of PLD (pulsed laser deposition) method, in the cathode coating thickness of only a few tens nm nm to the nickel oxide (NiO). Subsequently, cascading through the rotation of the P3HT coated semiconductor layer. Nickel oxide is expected to play a hole transport layer and the role of electronic interception, and the semiconductor layer is generated in the light of the electron and hole, efficient transportation to the cathode hole, the electronic interception, leading to reduced energy combined with the loss.

By studying the thickness of 5 ~ 77 nm in the nickel oxide layer was found in 5 ~ 10 nm thick at best, the original 3 to 4 per cent of the unit conversion efficiency has been raised to 5.2 ~ 5.6%. In addition, the open voltage has been increased by 40 percent.

Will further improve the hole transport layer at the same time, to develop a method of printing volumes of volumes of flexible floor of the solar cell production technology.

Source: 日经BP社 Mar. 3, 2008

U.K. High-Level Seminar On China Solar: Solar Cells Is Expected To Enter Low-Cost Era

The British Royal Society proposed that the high-level seminar in the solar held recently in Beijing. Organised by the International Cooperation Bureau, Chinese Academy of Sciences and the high-tech development by the Institute of Electrical contractors Institute, the Chinese Academy of Sciences vice president Li Jinghai, vice chairman of the British Royal Society Lorna Casselton, as well as between China and Britain more than 30 scientists attended the meeting.

In 2006, China's solar cell production capacity will reach 380 MW, the output ranks third in the world. 2007, China's production capacity of silicon materials reached 1,000,000 tons, the production capacity of solar cells reached 800 MW to 1000MW.

"The next two to three years, China's production capacity of solar cells could replace Europe and Japan to become the world's largest producer." Researcher at the Institute of the Chinese Academy of Sciences electrician Wang Wenjing said. Wang Wenjing said: "At present, large-scale industry has been the major solar cells for crystalline silicon solar cells, battery and costly. Expand with the demand for low-cost, thin-film solar cells gradually came to the surface, this battery low cost, crystal silicon cells is only 1 / 3 to 1 / 2, but due to technical limitations, this battery efficiency is not high. in this forum, the Chinese and British experts to discuss the topic of how to improve The battery efficiency. once achieve this goal, the cost of solar cells will be greatly reduced. "

Both sides in the 21st century the two major problems facing the world - the energy crisis and environmental problems reached a consensus: the development of solar energy has become an urgent task. Wang Wenjing said: "This year the South to concentrate on the serious snowstorm of the electricity grid was a problem, and makes the electrical energy security has become a major issue, distributed power supply study also on the agenda. While solar power is distributed power supply as an option. "

The Bureau also said: The two-day forum aims to provide an expert in the high-level platforms, understanding and the exchange of the two countries in the use of solar energy technology development policies, key technologies, and promote the development of solar energy-related measures, problems and the future technology road map, and give full play to the Institute of the Chinese Academy of Sciences related research in the field of solar comprehensive advantages, the progressive lay with the United Kingdom to carry out substantive cooperation.

Source: 科学时报 Mar. 5, 2008