New Family of Liquid and Solid Guanidine-based n-Type Dopants for Solution-Processed Perovskite Solar Cells

TitleNew Family of Liquid and Solid Guanidine-based n-Type Dopants for Solution-Processed Perovskite Solar Cells
Publication TypeJournal Article
Year of Publication2020
AuthorsNakayama, Hidenori, Julia A. Schneider, Mina Faust, Hengbin Wang, Javier Read de Alaniz, and Michael Chabinyc
JournalMaterials Chemistry Frontiers
Abstract

We present a series of new dopants based on a bicyclcic guanidine-type structure, 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), for organic semiconductors. A series of TBD derivatives that were alkylated at the 7-position were synthesized and their physical properties were determined. These stable dopants were shown to be effective n-type dopants for [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM), poly{[N,N'-bis(2-octyldodecyl)naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)} (P(NDI2OD-T2)) and 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2’,3’-d’]-s-indaceno[1,2-b:5,6-b’]dithiophene (ITIC). Films of PC61BM doped with 10 mol% of a dimeric derivative of TBD had electrical conductivities of 0.065 S/cm. The utility of the dopants was further shown by doping electron transport layers of PC61BM with 2TBD-C10 for methyl ammonium lead iodide (MAPbI3) solar cells leading to improved fill factors and PCEs relative to undoped ETLs.

URLhttps://doi.org/10.1039/D0QM00437E
DOI10.1039/D0QM00437E