2013年11月30日 Nature

nero1981

2013年11月30日 Nature8 C! A! A" |) O  x* M
About the cover
+ y- S4 I' e: \9 s  s" R$ nThe cover illustrates an oxide crystal generating electric current from incoming light. The spontaneous electrical polarization that characterizes a ferroelectric material is attractive for solar-cell applications as the positive and negative charges generated by light absorption have a natural tendency to separate, making them easier to harvest efficiently. Unfortunately most known ferroelectrics have wide electronic bandgaps — that is they absorb only higher energy photons that make up a small fraction of the solar spectrum. Ilya Grinberg and colleagues now show that a classic ferroelectric can be chemically engineered to tune the bandgap over a broad range, achieving strong absorption and photocurrent generation across the solar spectrum. (Cover by Felice Macera)
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