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The effect of light on polymer solar cells

by:dcfpower     2021-03-22
u003cpu003eAbstract: Taking polymer organic solar cells as the research object, study the effect of light on the performance of organic solar devices. It is found that under the condition of continuous light, the performance of the device changes. After the organic film is heat-treated, the light transmittance is increased. The organic active layer is heat-treated at 140 ℃, and the photoelectric conversion efficiency of the device is the largest. Keywords: organic solar cells; conversion efficiency; transmittance. At present, organic solar cells are one of the popular directions in the field of solar cell research. Compared with inorganic solar cells, the conversion efficiency of organic solar cells has been greatly improved. However, the production cost of organic solar cells is still very expensive in terms of materials and technology. However, the unique advantages of organic solar cells have attracted the attention of many researchers. Organic solar cells have many advantages, such as flexibility, light weight, environmental protection, low cost and abundant materials. Its biggest advantage is that organic solar cells can be produced quickly with suitable equipment. In view of these characteristics, organic solar cells have broad application prospects. However, organic solar cells also have disadvantages: low photoelectric conversion efficiency, short life span, and susceptibility to corrosion by water and oxygen, making their performance unstable. Many research groups have studied on single-cell solar cells and found that the photoelectric conversion efficiency of single-cell organic solar cells can reach 10%. However, there are still many problems for practical applications, even industrialization. The photoelectric conversion efficiency of organic solar cells is different from that of inorganic solar cells. The magnitude of the photocurrent depends on the following four aspects: the active layer material absorbs photons and generates excitons; the excitons diffuse to the corresponding area; the excitons are separated into freely moving holes and electrons under the action of the internal electric field; holes and electrons Collected by the corresponding electrode to form a current. Therefore, the absorption of light, the generation of excitons, the separation of excitons, and the collection of holes and electrons play an important role in organic solar cells. Many research groups have conducted research on improving the photoelectric conversion efficiency of organic solar cells. This paper mainly studies the effects of light and heat treatment on the performance of organic solar cells. By means of heat treatment, the light transmittance and crystallinity of the film are improved, and the photoelectric conversion efficiency of the device is further improved. For more content, please check the original literatureu003c/pu003eu003c/pu003e
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