title: Hole transport enhancing effects of polar solvents on poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid) for organic solar cells.
abstract: This study analyzed the properties of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid) (PEDOT:PSS) thin-films prepared by spin-coating solutions made with the polar solvents methanol, acetone, or N,N-dimethylformamide (DMF). A characteristic analysis was carried out for poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C(61)-butyric acid methyl ester (PCBM)-based organic solar cells (OSCs) having these modified PEDOT:PSS thin-films as the hole transport layer. The resistivity of the PEDOT:PSS thin-film obtained from the DMF solution was 4.89 × 10(-3) Ω·cm with a roughness of 3.23 × 10° nm, compared to 3.51 × 10(-1) Ω·cm and 7.72 × 10(-1) nm for a pristine PEDOT:PSS thin-film. The dipole moment increase of the solvent led to the decreased resistivity and the increased roughness and transparency of PEDOT:PSS thin-films on the structural arrangement of the polymers. Highly efficient OSCs with a power conversion efficiency of 3.47% were obtained when DMF-treated PEDOT:PSS thin-film was used as the hole transport layer.
authors.affiliation: School of Electrical, Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea.
authors.forename: Jeong Suk
authors.initials: JS
authors.lastname: Yang
authors.forename: Sang Hoon
authors.initials: SH
authors.lastname: Oh
authors.forename: Dong Lim
authors.initials: DL
authors.lastname: Kim
authors.forename: Si Joon
authors.initials: SJ
authors.lastname: Kim
authors.forename: Hyun Jae
authors.initials: HJ
authors.lastname: Kim
mesh_terms: D037741:Fullerenes / Q000737:chemistry; D011137:Polystyrenes / Q000737:chemistry*; D012993:Solar Energy; D012997:Solvents / Q000737:chemistry*; D013876:Thiophenes / Q000737:chemistry*
chemical_list: C539575:(6,6)-phenyl C61-butyric acid methyl ester; D037741:Fullerenes; D011137:Polystyrenes; D012997:Solvents; D013876:Thiophenes; C533756:poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate); C507295:poly(3-hexylthiophene)