IMEC, demonstrated a 18% conversion efficiency for silicon solar cells made of BP Solar’s newly developed Mono2™ silicon
By combining IMEC’s advanced processing techniques with BP Solar’s high-quality low-cost substrates, the companies demonstrated that Mono2™ has a good potential to become a new base material for low-cost highly-efficient solar cells.
BP Solar’s Mono2™ production process delivers a promising new wafer platform for solar cells with the potential to become a low-cost alternative to the more expensive Czochralski silicon substrates because it combines extremely low defect densities and high conversion efficiencies with production costs that are comparable to the costs of traditional multicrystalline substrates. The production of Mono2™ involves a proprietary growth nucleation process for the casting of ingots used to produce single crystal bricks and wafers whereby preferred crystallographic orientations can be achieved. This feature allows further improvement in cell efficiencies. BP Solar’s Mono2™ was developed with support of the U.S. Department of Energy’s Technologies Pathways Partnership.
IMEC’s cell production process is feasible as an industrial production process as it only adds three processing steps to the standard industrially applied process of full aluminum back surface field.
IMEC’s solar cells are 130µm thick and cover an area of 156mmx156mm. Using IMEC’s advanced processes such as dielectric passivation and a localized back surface field, a conversion efficiency of 18% for the new low-cost Mono2™ silicon solar cells, which is in the range of the current commercial solar cells, has been demonstrated with a dramatic reduction in cell thickness.
Jef Poortmans, Program Director Photovoltaics said, “IMEC’s photovoltaic research aims towards a sharp reduction in production cost and at the same time an increase of the efficiency of crystalline silicon solar cells. Our partners can leverage our advanced processing techniques, to create high-efficiency low-cost solar cells based on their proprietary high-quality materials and knowhow.”
Eric Daniels, BP Solar’s vice president, global technology said “BP Solar is working to leverage such key technology developments to further reduce the cost of PV electricity. Working with R&D centers such as IMEC and key customers, we are commercializing this technology and seek to provide a better platform for the current and next generation solar cells. This collaboration with IMEC represents significant progress towards that goal.”
IMEC performs world-leading research in nanotechnology. IMEC leverages its scientific knowledge with the innovative power of its industrial partners. In ICT, healthcare and energy, IMEC delivers industry-relevant technology solutions. In a unique high-tech environment, IMEC’s international top talent is committed to providing the building blocks for a better life in a sustainable society.
IMEC is headquartered in Leuven, Belgium, and has offices in Belgium, the Netherlands, Taiwan, US, China and Japan. Its staff of more than 1,650 people include over 550 industrial residents and guest researchers. In 2008, IMEC’s revenue (P&L) was 270 million euro.
About BP Solar
BP Solar, part of BP Alternative Energy, is a global company with about 2,200 employees. BP Solar designs, manufactures and markets products which use the sun’s energy to generate electricity for use in the residential, commercial and industrial sectors. With over 35 years of experience and installations in most countries, BP Solar is one of the world’s leading solar companies having manufacturing plants in: Xi’an, China; Bangalore, India; and Frederick, MD, USA. BP Solar invests more than $10M annually in photovoltaic research and development.