[10p-Z11-1~16] 12.5 Organic solar cells

[10p-Z11-3] π-Conjugated Polymers Based on Naphthobispyrazinebisimide as n-type Materials for All-Polymer Solar Cells

〇Kenta Okamoto¹, Tsubasa Mikie¹, Mashiko Saito¹, Kimihiro Komeyama¹, Osaka Itaru¹ (1.Hiroshima Univ.)

Keywords:Organic Solar Cells, n-type semiconductor, All-Polymer Solar Cells

Naphthobispyrazine (NPz) with two imide groups, namely, naphthobispyrazinebisimide (NPI), is a promising building unit for n-type semiconducting materials owing to its high electron-deficiency. We have recently reported that π-conjugated polymers based on NPI offer deep frontier molecular orbital energy levels, and show n-type behavior with relatively high electron mobility in transistors. Here, we synthesized new NPI-based polymers copolymerized with fluorinated bithiophene and thiophene derivatives. We applied them to all-polymer solar cells as the n-type material. In this presentation, we will show the synthesis, properties, and photovoltaic properties of the polymers, and discuss the structure-property relationships.