A Benzodithiophene-Based Novel Electron Transport Layer for a Highly Efficient Polymer Solar Cell

• Published in: ACS applied materials & interfaces Vol. 6; no. 18; pp. 15875 - 15880
• Main Authors: Kim, Hong Il, Bui, Thi Thu Trang, Kim, Guan-Woo, Kang, Gyeongho, Shin, Won Suk, Park, Taiho
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 24-09-2014
• Subjects: polymer solar cell; water-/alcohol-soluble polymers; conjugated polyelectrolyte; PBN; electron transport layer
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/am503419r

We designed and synthesized a novel conjugated polyelectrolyte (CPE), poly­{3-[2-[4,8-bis­(2-ethyl-hexyloxy)-6-methyl-1,5-dithia-s-indacen-2-yl]-9-(3-dimethylamino-propyl)-7-methyl-9H-fluoren-9-yl]-propyl}-dimethyl-amine (PBN). We employed PBN as an electron-transporting layer on a ZnO layer and constructed a highly efficient, inverted structure device consisting of a mixture of poly­({4,8-bis­[(2-ethylhexyl)­oxy]­benzo­[1,2-b:4,5-b′]­dithiophene-2,6-diyl}­{3-fluoro-2-[(2-ethylhexyl)­carbonyl]­thieno­[3,4-b]­thiophenediyl}) (PTB7) and PC70BM, achieving a high power conversion of up to 8.6%, constituting a 21.1% improvement over the control device performance (7.1%) prepared without a PBN layer. This result was ascribed to the reduced interfacial resistance and the improved charge transport and collection through the PBN electron transport layer.