Yingli Green Energy, ECN and Amtech Join Efforts to Develop N-type MWT High Efficiency PV Cell and Module

BAODING, China, September 7, 2011 /PRNewswire-Asia-FirstCall/ -- Yingli Green Energy Holding Company Limited (NYSE: YGE) ("Yingli Green Energy" or the "Company"), a leading solar energy company and one of the world's largest vertically integrated photovoltaic ("PV") manufacturers, which markets its products under the brand "Yingli Solar", the Energy research Centre of the Netherlands ("ECN"), a leading solar research center in Europe, and Amtech Systems, Inc. (NASDAQ: ASYS) ("Amtech"), a global supplier of production and automation systems and related supplies for the manufacture of solar cells through its solar division Tempress Systems B.V., today announced the achievements of a three-party research collaboration on the N-type Metal Wrap Through ("N-MWT") PV cell and module technology. This joint project was an extension of Project PANDA, which was kicked off in 2009. As of the date of this press release, a cell efficiency of 19.7% and a module efficiency of 17.6% have been achieved in the laboratory, respectively.

The N-MWT PV cell technology is expected to reduce up to 40% of the metal coverage comparing to standard crystalline cells, which leads to approximately 1.5% relative cell efficiency gain. ECN has also shown that the PV modules based on N-MWT technology can be made with thin cells at high yield, which demonstrates the potential to reduce the wafer thickness and silicon consumption, leading to a large cost reduction potential.

Mr. Jingfeng Xiong, Vice President of Technology of Yingli Green Energy, commented, "We are pleased to announce the new milestones of Project PANDA, which demonstrates our solid cooperation with leading technology institutes in solar industry. Together this joint project, we target to reach towards 20% cell efficiency and module efficiencies of 18% and more. The launch of N-MWT PV cell and module illustrates our mission to be a cost leader and provide the best product to customers at the same time."

"Thanks to our continuous investment in cutting edge technologies, we can further enhance our leading position in terms of high efficiency products," Mr. Liansheng Miao, Chairman and Chief Executive Officer of Yingli Green Energy, commented. "High efficiency module is becoming much more attractive for project investors as the roof-top system segment has been enjoying a fast development speed. We are glad that we have the capability to meet customers' demand."

Mr. Robert Kleiburg, Technology Director of ECN, commented, "We are very pleased to combine our MWT technology with Yingli's years of experience to commercialize cutting edge technologies. This cooperation is in line with our long-term mission: transfer high-level knowledge and technology to the market."

About Yingli Green Energy

Yingli Green Energy Holding Company Limited (NYSE: YGE), which markets its products under the brand "Yingli Solar," is a leading solar energy company and one of the world's largest vertically integrated photovoltaic manufacturers. Yingli Green Energy's manufacturing covers the entire photovoltaic value chain, from the production of polysilicon through ingot casting and wafering, to solar cell production and module assembly. Currently, Yingli Green Energy maintains a balanced vertically integrated production capacity of over 1 GW per year. Two capacity expansion projects of 600 MW and 100 MW n Baoding and Hainan, respectively, started initial production in early July 2011 and are expected to increase the Company's total nameplate capacity to 1.7 GW in late 2011. In addition, Yingli Green Energy's in-house polysilicon plant, Fine Silicon, which has a designed annual production capacity of 3,000 metric tons, has successfully started commercial operation in early August 2010. Yingli Green Energy distributes its photovoltaic modules to a wide range of markets, including Germany, Spain, Italy, Greece, France, South Korea, China and the United States. Headquartered in Baoding, China, Yingli Green Energy has more than 11,000 employees and more than 10 subsidiaries and branch offices worldwide. Yingli Green Energy is publicly listed on the New York Stock Exchange (NYSE: YGE). For more information, please visit http://www.yinglisolar.com.

About ECN

The Energy research Centre of the Netherlands (ECN) is the largest research center in the field of energy in the Netherlands. ECN's technologies are used in solar energy conversion, as well as for other alternative energy sources, such as biomass, wind energy, hydrogen & clean fossil fuels. In cooperation with universities, other research institutes and the industry, ECN develops high-quality knowledge and technology for a sustainable energy system, and transfers this knowledge to the market. ECN is well recognized for its solar cell and module technology development of industrial p-type and n-type processes and industrial implementation, both for conventional cells as well as back-contact cells. ECN has a strong background in developing, testing, validation and implementation of new module processes with a strong focus on improving the cost-performance ratio. For more information, visit www.ecn.nl.

About Amtech

Amtech Systems, Inc. manufactures capital equipment, including silicon wafer handling automation, thermal processing equipment and related consumables used in fabricating solar cells, LED and semiconductor devices. Semiconductors, or semiconductor chips, are fabricated on silicon wafer substrates, sliced from ingots, and are part of the circuitry, or electronic components, of many products including solar cells, computers, telecommunications devices, automotive products, consumer goods, and industrial automation and control systems. The Company's wafer handling, thermal processing and consumable products currently address the diffusion, oxidation, and deposition steps used in the fabrication of solar cells, LEDs, semiconductors, MEMS and the polishing of newly sliced silicon wafers.

Safe Harbor Statement

This press release contains forward-looking statements. These statements constitute "forward-looking" statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, and as defined in the U.S. Private Securities Litigation Reform Act of 1995. These forward-looking statements can be identified by terminology such as "will," "expects," "anticipates," "future," "intends," "plans," "believes," "estimates," "target" and similar statements. Such statements are based upon management's current expectations and current market and operating conditions, and relate to events that involve known or unknown risks, uncertainties and other factors, all of which are difficult to predict and many of which are beyond Yingli Green Energy's control, which may cause Yingli Green Energy's actual results, performance or achievements to differ materially from those in the forward- looking statements. Further information regarding these and other risks, uncertainties or factors is included in Yingli Green Energy's filings with the U.S. Securities and Exchange Commission. Yingli Green Energy does not undertake any obligation to update any forward-looking statement as a result of new information, future events or otherwise, except as required under applicable law.