Thiadiazole quinoxaline-based copolymers with ∼1.0 eV bandgap for ternary polymer solar cells

Side-chain Engineering of Benzo[1,2-b:4,5-b’]dithiophene Core-structured Small Molecules for High-Performance Organic Solar Cells

“…The electronic structures and geometries of SMs was also investigated with DFT calculation using Gaussian program at the B3LYP/6-31G (d,p) level 27 38 . All alkyl side chains were replaced with methyl groups to reduce the computational cost.…”

Synthesis and properties of mono‐ and di‐fluoro‐substituted 2,3‐didodecylquinoxaline‐based polymers for polymer solar cells

“…An attempt to tune the properties of Qx‐based polymers, various electron‐rich units such as benzodithiophene (BDT), indacenodithiophene, fluorene, carbazole, and thiophene derivatives were polymerized with Qx derivatives . Also, a variety of electron withdrawing units such as fluoro, imide, thiadiazole, and triazole were attached on the 6 and 7th‐positions of the Qx backbone. The careful study suggests that the electron‐rich BDT and tri‐thiophene (Tt) derivatives are the best choices for the preparation of efficient Qx‐based donor–acceptor (D–A) polymers.…”

“…Worth to note that the aryl substituents were incorporated mostly on 2nd and 3rd‐positions of the Qx unit (Fig. for example) and polymerized with many different electron rich units, and explored as a donor material on PSCs . The efficient aryl‐substituted 6,7‐difluoroquinoxaline‐based polymers containing electron rich BDT (PBDT‐TFQ and PDBTQEH) and Tt (PDFQx‐3 T) are outlined in Figure .…”

“…) was also found to be very high . Consequently, we think that the polymerization of Tt derivative with each of FQx and DFQx derivatives might give efficient polymer for PSCs because the small structural changes on the polymer main or side chains bring the big difference in their photovoltaic performance . We inserted alkyl (n‐hexyl) group on the 4 + position of thiophene attached to Qx unit (Fig.…”

Synthesis, characterizations, and electrochromic properties of donor–acceptor type polymers containing 2, 1, 3‐benzothiadiazole and different thiophene donors

“…[11][12][13][14][15] In addition, because of the mesomeric effects inducing a strong double bond character between donor and acceptor moieties, D-A approach is one of the most effective ways to obtain low band polymers, which present unique electrochemical, optical properties and are greatly desired for electrochromic applications. [16][17][18] Thiophene and its derivatives have occupied the prime position as the monomers of choice to obtain cathodically coloring and highly stable electroactive polymers. [19][20][21] Several thiophene donors such as thiophene (Th), 3,4-ethylenedioxythiophene (EDOT), 3,4-propylene-dioxythiophene (ProDOT) have been applied to synthesize novel D-A ECPs, as the thiophene-based polymers always possess a low oxidation potential (i.e., a high-lying HOMO), allowing the materials to undergo rapid and reversible switching.…”