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2013年11月30日 Nature
s1 U* @& r, t8 P% X MAbout the cover
) {' N; S4 F! f/ b7 d$ j5 \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)& R5 f0 a! q2 Y$ i* ^0 t2 f) K
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发表于 2013-11-30 18:46
发表于 2013-11-30 19:21
