Investigation the effect of π bridge and side chain on photovoltaic properties of benzodithiophene and quinoxaline based conjugated polymers

Research progress and application of high efficiency organic solar cells based on benzodithiophene donor materials

“…[198] Similarly,P(BDT-DTQx) (2013) was prepared by Fu et al; [92] PBDT-TDTQx (2016) andPBDT-TTDTQx (2016) were reported by Kim et al; [199] POF1 (2016) and POF2 (2016) were designed by Singh et al; [200] P3 (2022) was also prepared by Aslan and co-workers, respectively. [201] Notably, after blending with the acceptor PC 71 BM, PBDT-TDQx and PBDT-TTDTQx with the substitution of solubilized alkyl chain 2-butyloctyl effectively improve the miscibility of donor in the active layer. Furthermore, benefiting benzene-based side chain broads the conjugated plane of P3 as well as "F" atoms further decrease the HOMO energy level of POF1 and POF2, thus PBDT-TDTQx: PC 71 BM based (0.80 V), PBDT-TTDTQx: PC 71 BM based (0.78 V), POF1: PC 70 BM based (0.79 V), POF2: PC 70 BM based (0.77 V) and P3: PC 71 BM based (0.80 V) OSCs obtained a higher V oc than PBDT-TQ: PC 70 BM based OSC (0.65 V).…”

“…In addition, Fan et al prepared P2 (2016) by introducing the side chain (2-hexyldecyl) (p -tolyl) sulfane into the BDT unit as well as 1-methyl-3-(octyloxy)benzene into the Qx unit, respectively. [150] Similarly, Aslan et al synthesized P1 (2022) by introducing selenophene-based and benzene-based side chains into the BDT and Qx unit in turn, [201] designing based on the theory that "Se"-based materials with strong interaction between "Se" and "Se" molecules not only extends the π-orbitals but also promotes hole/electron mobility. [84] After blending with acceptors, P2 (2016): PC 61 BM based and P1 (2022): PC 71 BM based OSCs obtained theV oc of 0.81 and 0.80 V,J sc of 7.72 and 8.39 mA/cm 2 ,FF of 68.79 and 60.8% and PCE of 4.28 and 4.10%, respectively.…”

“…Furthermore, the introduction of alkyl substituted thiazole π-bridge is also conducive to further increase the miscibility of polymer donors into the active layer, thereby PTBTz-Me: PC 71 BM based, PTSBTz-Me: PC 71 BM based and PPSBTz-Me: PC 71 BM based OSCs were obtained a relatively higher J sc and FF . Moreover, based on the π-bridge unit selenophene, PBDTTSBO(P3) (2014) , [155] PBDTSSBO(P7) (2014) [155] and P2 (2015) [156] were reported based on the main chain BDT-Sp-BTDz-Sp; PBDTTSBS(P5) (2014) and PBDTSSBS(P8) (2014) were prepared based on the polymer backbone BDT-Sp-BSDz-Sp; [155] J76 (2019) was synthesized based on the polymer skeleton BDT-Sp-BTDz-Sp;BDTSeQ(P1) (2019) , [316] P2 (2022) [201] and P4 (2022) [201] were also designed based on the main-chain engineering BDT-Sp-Qx-Sp, in that order. Notably, compared with the reported results between PFBTFQ: PC 71 BM based and PBDTSeQ: PC 71 BM based OSCs, selenophene π-bridge unit exhibited a high adaptability in main-chain engineering, which endowed PBDTSeQ: PC 71 BM based OSC with an optimized photovoltaic performance.…”

A two-armed skeleton extension strategy for the design of novel spirobifluorene-based small molecule donors

“…To date, under the synergy of molecular structure engineering and device engineering, the PCE of OSCs has exceeded 19%. 11,12 After the advent of promising Y-series acceptors, [13][14][15][16] extensive efforts have been devoted to the research of BHJ OSCs based on the active layer of the polymer donor and Y-series acceptor. Nevertheless, many studies still focus on all-small-molecule BHJ OSCs, because small molecule donor (SMD) materials have nonnegligible advantages such as well-defined molecular structures, easy purification, and good photovoltaic performance reproducibility.…”

Structure-Electrochemical Property Relationship of F vs 2F Substituents in Low Bandgap Conjugated Polymers

“…Furthermore, HOMO energy level was deduced from the E ox onset according to the following equation. 38 = Galvanostatic charge-discharge.-Electrochemical properties of the P1 and P2 were also investigated using GCD measurements. GCD tests at different current densities (0.02, 0.04, 0.08 and 0.16 mA cm −2 ) have been performed.…”