然而，塑料太阳能电池向另一释放电子和空穴形成激子时束缚力很强。
However, in plastic solar cells the liberated electrons and holes bind strongly to one another, forming particle-like entities known as excitons.
科学家们发明了一种以塑料太阳能电池来把太阳光的能量转换成电能的方法，即使是在阴天的时候也可以做到。
Scientists have invented a plastic solar cell that can turn the sun's power into electrical energy, even on a cloudy day.
他们发现在导电塑料太阳能电池中添加氧化钛(titanium oxide)，并放入烤箱中烘焙，可增加该电池的光电转换率。
They found that by adding titanium oxide to such a cell and then baking it in an oven, they could increase the efficiency with which it converted solar energy into electricity.
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