2013年11月30日 Nature

nero1981

2013年11月30日 Nature  L, }2 T/ @; ^9 B3 c5 ?& z: ^- P
About the cover1 M1 S  B4 t7 V. w. Z+ n3 A, v
The 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)2 o1 |! q: }- j; [
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