At the junction where the two materials meet, electrons pair up with holes to form an area depleted of charge that prevents current from flowing.

两种材料的接合处电子与电穴配对形成一个没有电荷的区域，阻止电流通过。

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When a current is applied across the sandwich, the electrons and holes team up at the junction of the two materials and release energy in the form of light.

电流流过夹层，电子和空穴在两种材料接口处共同发挥作用，释放光能。

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The invention provides an ion pipe with a plurality of ion beam extraction holes, so that the ion beam current density becomes uniform.

本发明提供一种排列有多个离子束引出孔的离子管，使得离子束电流密度变得均匀。

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This finding is at odds with the current thinking about how supermassive black holes form at the center of new galaxies, which makes it of particular interest to astronomers.

FORBES: Astronomers Find One Of The Biggest Supermassive Black Holes Yet

When a current is applied across the sandwich, the electrons and holes team up at the junction of the two materials and release energy in the form of light.

ECONOMIST: Lighting: A brilliant new approach | The

"We often think of black holes pulling in matter, but actually what we observe with our current instrumentation is matter flying out, " said Timothy Kallman of NASA's Goddard Space Flight Center in Greenbelt, Maryland, in a statement.

CNN: Black holes in a new light