D18

• CAT Number: M440090
• CAS Number: 2433725-54-1
• Molecular Formula: (C76H92F2N2S9)n
• Purity: ≥95%
• Synonyms: Poly[(2,6-(4,8-bis(5-(2-ethylhexyl)-4-fluoro)thiophen-2-yl)-benzo[1,2-b:4,5-b’]dithiophene)-alt-5,5′-(5,8-bis(4-(2-butyloctyl)thiophen-2-yl)dithieno[3′,2′:3,4;2”,3”:5,6]benzo[1,2-c][1,2,5]thiadiazole)]
• Solubility: o-Xylene, chloroform, chlorobenzene and dichlorobenzene
• Storage: Room Temperature (Recommended in a cool and dark place)
• HOMO / LUMO: HOMO = -5.51 eV, LUMO = -2.77 eV

D18 (PCE18) is a narrow bandgap donor copolymer featuring an alternating backbone of electron-donating benzodithiophene (BDT) and electron-accepting fused-ring dithienobenzothiadiazole (DTBT) units. Its planar molecular structure and extended conjugation from DTBT confer excellent charge transport properties, with hole mobility reaching 1.59 × 10⁻³ cm² V⁻¹ s⁻¹. When paired with Y6 as the acceptor in single-junction non-fullerene polymer solar cells (NF-PSCs), D18 has achieved efficiencies up to 18.22% with certified results of 17.6%. Additionally, D18 is solution-processable in non-halogenated solvents such as o-xylene, making it an efficient, scalable, and environmentally friendly choice for next-generation OPVs.