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Exciton Diffusion Measurements in Poly (3-hexylthiophene)

机译:聚(3-己基噻吩)中的激子扩散测量

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摘要

Polymer solar cells are a promising technology for future power generation. In particular the polymer poly (3-hexylthiophene) (P3HT) has attracted widespread interest with power conversion efficiencies close to 5%. Such devices employ the bulk heterojunction device structure, where the polymer is blended with a strong charge acceptor such as a fullerene. The processing of the blend affects its morphology and the formation of domains of P3HT-rich and fullerene-rich regions. It is at the interface between these two domains that excitons are dissociated into their constituent charges, a critical step in the operation of a solar cell. Excitons are only able to diffuse a short distance during their lifetime and therefore the size of the domains should ideally be on the order of the diffusion length, maximising the number of excitons reaching the interface and undergoing dissociation.
机译:聚合物太阳能电池是未来发电的有前途的技术。特别地,聚合物聚(3-己基噻吩)(P3HT)引起了广泛的关注,功率转换效率接近5%。此类装置采用本体异质结装置结构,其中聚合物与强电荷受体(例如富勒烯)混合。共混物的加工过程会影响其形态以及富P3HT和富勒烯区域的结构域的形成。激子正是在这两个域之间的界面解离为它们的组成电荷,这是太阳能电池运行中的关键步骤。激子只能在其寿命内扩散很短的距离,因此,理想情况下,畴的大小应在扩散长度的数量级上,以使到达界面并经历解离的激子数量最大化。

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