Self-assembly of carboxylated polythiophene nanowires for improved bulk heterojunction morphology in polymer solar cells

Weiwei Li, Brian J. Worfolk, Peng Li, Tate C. Hauger, Kenneth D. Harris, Jillian M. Buriak
2012 Journal of Materials Chemistry  
Conjugated regioregular poly[3-(5-carboxypentyl) thiophene-2,5-diyl] (P3CPenT), a derivative of poly(3-hexylthiophene) (P3HT), is introduced as a hole transport layer (HTL) for P3HT:PCBM plastic solar cells (PSCs). P3CPenT, a carboxyl-functionalized polythiophene, is insoluble in solvents typically used in the preparation of photoactive layers such as chloroform, chlorobenzene and dichlorobenzene, allowing successive processing of the photoactive layer without dissolution of the HTL. P3CPenT
more » ... the HTL. P3CPenT selfassembles into nanowires in DMSO solution and when cast as a film, reduces concentration gradients of P3HT:PCBM photoactive layers. P3HT:PCBM PSCs incorporating P3CPenT nanowires as the HTL have a higher fill factor (FF, 0.67) and power conversion efficiency (PCE, 3.7%) than devices with conventional PEDOT:PSS HTLs.
doi:10.1039/c2jm30576c fatcat:nhocwcofz5dghdkmqlsuwidvn4