Abstract
Bulk-heterojunction (BHJ) solar cells using n-type semiconducting polymers, instead of the conventional fullerene derivatives, are known as all-polymer solar cells. Their significant advantages include designable structures of both p-type and n-type semiconducting polymers. In this chapter, recent advances in all-polymer solar cells are introduced. Particular attention is focused on the development of high-performance n-type semiconducting polymers. However, organometallic polymers have generally been employed as p-type semiconductors in BHJ solar cells. Therefore, there are a few examples of all-polymer solar cells based on organometallic polymers. In order to solve this problem, a novel method of inverting the semiconducting feature is applied to produce promising Pt-polyyne polymers with potentially n-type energy levels. The main chain alkynes of the precursor Pt-polyyne polymers are modified by the high-yielding transformation into tetracyanobutadiene units through a [2 + 2] cycloaddition-retroelectrocyclization with tetracyanoethylene (TCNE). All-polymer solar cells composed of the p-type poly(3-hexylthiophene) (P3HT) and n-type Pt-polyyne polymer are successfully fabricated, and the photocurrent generation is demonstrated.
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