United States scientists through the opposite of traditional scientific research new ways of thinking, using gallium arsenide produced the highest conversion efficiency of 28.4% thin-film solar cells. Key is not in the solar cell efficiency enhancement is to allow it to absorb more photons but to make it release more photons, future made of gallium arsenide solar cells is expected to exceed limits of energy efficiency into records.
The past, the scientists stressed by increased solar absorption of photon number to enhance the efficiency of solar cells. Electronic solar after absorb sunlight must be extracted, and those who have not been fast enough to extract electronic will decay and release their energy.
United States Department of energy's Lawrence Berkeley National Laboratory scientists under the leadership yilai·yabulunuoweiqi studies have shown that if the free energy of fluorescence emission as an external, solar cell output voltage will increase. Yabulunuoweiqi said: "our research shows that higher the efficiency of solar cells release a photon, its energy conversion efficiency and provide the higher voltage. External-fluorescence is solar cell conversion efficiency to achieve theoretical maximum value-xiaokelai·kuisaier key to efficiency limits. For a single p-n junction solar cells, the maximum value of approximately 33.5%. "
Participation researcher Erwin Miller explained that open environments in solar cells, electronics have nowhere to go, there will be secret huddled together, the ideal situation is, they emitted outside fluorescence, precise balance of incident sunlight.
Based on this, founded jointly by ya-Lu nuoweiqi Arta device companies using ya-nuoweiqi single crystal films of the early research and development technology of Shandong province--Epitaxial layers split technology, using gallium arsenide has produced the highest conversion efficiency of 28.4% thin-film solar cells. This battery is not only broke the previous conversion rate, its cost is also lower than other solar cells. At present the most efficient commercial solar cell manufactured by Silicon, highest conversion efficiency of 23%. GaAs although more expensive than silicon, but it collects photons is more efficient. As far as the price/performance, gallium arsenide are ideal materials for making solar cells.
Yabulunuoweiqi said: "high performance associated with external fluorescent solar cells, our theory will Significantly change the face of future solar cells, we will live in a solar cell is very cheap and efficient in the world. ”
