30 May '14, 7pm

Quantum Dot Solar Cells Break Conversion Efficiency Record

Quantum Dot Solar Cells Break Conversion Efficiency Record

Quantum dots have offered an attractive option for photovoltaics. Multijunction solar cells made from colloidal quantum dots (CQD) have been able to achieve around 7-percent conversion efficiency in the lab. While figures like this may not seem too impressive when compared to silicon solar cells, their promised theoretical conversion efficiency limit is an eye-popping 45 percent . This is possible because when a single photon is absorbed by a quantum dot, it produces more than one bound electron-hole pair, or exciton, thereby doubling normal conversion efficiency numbers seen in single-junction silicon cells. Now researchers at the Massachusetts Institute of Technology (MIT) have raised the bar for quantum dot-based solar cells by producing one that changes light to electricity with 9-percent conversion efficiency . Furthermore, says the MIT team, it can be produced using ...

Full article: http://spectrum.ieee.org/nanoclast/green-tech/solar/quant...

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