The interaction between the energized electron and the hole it leaves behind is called an exciton, and the difference in energy levels between the hole and the electron is known as the bandgap.
这种获得能量的电子和他留在原来能级上对应的位置的空穴的相互作用叫做一个激子激发过程，而这两个不同能级之间的部分被称作带隙。
If the photon energy is greater than the bandgap of the cell material, then electrons are excited into the conduction band.
如果光子的能量高于电池材料的能带，那么电子就被激发到导带中。
Similarly, an electron outside the bandgap cannot lose a little bit of energy and fall just a little bit closer to the nucleus.
同样，电子以外的带隙不能失去一点点能源和秋天刚刚有点接近核心。
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