The dye molecules themselves are bound to tiny particles of titanium dioxide, a less-famous semiconductor than silicon, and the whole assembly is immersed in anelectrolyte and sandwiched between two electrodes. When a photon of light is absorbed by adye molecule, an electron is knocked into the titanium dioxide. From there it travels to oneof the electrodes and a current is thus generated.
光敏染料分子本身附着在二氧化钛微粒上,二氧化钛是种半导体,没有硅那么广为人知。整个附着过程都是在电解液里两个电极之间进行的。当一个染料分子吸收一个光子时,一个电子就会受到碰撞,进入二氧化钛中。电子从那里向其中一个电极运动,由此产生电流。
The flexibility brought by the dye-based approach makes this sort of cell particularly usefulindoors. Silicon-based solar cells have been optimised for sunlight. But artificial light,whether of the incandescent, fluorescent or LED variety, contains a different mixture offrequencies from that put out by the sun. By changing the composition of the dye, G24 sengineers ensure that the maximum sensitivity of the cell coincides with whateverfrequency mix is appropriate for the artificial light concerned.
染料电池的这种灵活性让其特别适用于室内,硅光电池则已被优化至最有利于吸收阳光。但人造光的光谱都和阳光的不同。通过改变所用染料的成分,G24的工程师保证了光电池的最大感光度与特定场合使用的适当的人造光源的光谱相吻合。
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