To obtain a polymer based on benzodithiophene (BDT) owning both largely extended π-conjugation system and low-lying highest occupied molecular orbital (HOMO), (PBDTBzT-DTffBT) containing benzothienyl-substituted BDT is designed synthesized. Compared with the (PBDTT-DTffBT) thienyl-substituted BDT, PBDTBzT-DTffBT exhibits better thermal stabilities, red-shifted absorption spectra, stronger intermolecular interactions. The HOMO lowest unoccupied (LUMO) in are decreased by 0.11 0.13 eV,...

Abstract All‐polymer solar cells (APSCs) have attracted increasing attention due to the superior stability and mechanical flexibility. However, power conversion efficiencies (PCEs) of APSCs fall behind ascribed limited efficient polymer donors ( P D s). Particularly, there are rare reports high‐performance s with ultrawide bandgaps, which indispensable maximally harvest high‐energy photons for better light utilization. Herein, significance intramolecular charge transfer quinoid resonance...

Abstract To achieve commercial application of organic solar cells (OSCs), it is necessary to reduce material costs and improve device efficiency. This paper reports on the utilization a multifunctional building block, namely 3‐cyanoesterthiophene, which exhibits simple structure accessibility synthetic for cost‐effective high‐performance polymer donors (PDs). Meanwhile, ternary terpolymerization strategies have been studied. Two similar PDs, PBTCl0‐TCA PBTCl100‐TCA, are synthesized, devices...

Two novel conjugated microporous networks, P-1 and P-2, with carbazole–spacer–carbazole topological model structures, were designed prepared by FeCl3 oxidative coupling polymerization. Monomer m-1 (fluorenone spacer) was modified a thiophene Grignard to form the fluorenyl tertiary alcohol monomer m-2, this step can increase polymerization branches from four five incorporate polar –OH group into building block. N2 adsorption isotherms show that, after modification, Brunauer–Emmett–Teller...

Abstract Based on the most recently significant progress within last one year in organic photovoltaic research from either alkylthiolation or fluorination benzo[1,2‐ b :4,5‐ ′]dithiophene moiety for high efficiency polymer solar cells (PSCs), two novel simultaneously fluorinated and alkylthiolated benzo[1,2 ‐b:4 ,5 ‐b ′] dithiophene (BDT)‐based donor–acceptor (D–A) polymers, poly(4,8‐bis(5′‐((2″‐ethylhexyl)thio)‐4′‐fluorothiophen‐2′‐yl)benzo[1,2‐ ′]dithiophene‐2,6‐diyl)‐ alt...

A PCE of 9.02% for a two-dimensional polymer as donor applied in solar cells was obtained without any additive treatment.

A new two-dimensional (2D) organic small molecule, DCA3T(T-BDT), was designed and synthesized for solution-processed solar cells (OSCs). DCA3T(T-BDT) exhibited a deep HOMO energy level (−5.37 eV) good thermal stability. The morphologies of the DCA3T(T-BDT):[6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) blends were investigated by atomic force microscopy crystallinity explored X-ray diffraction (XRD) 2D grazing incidence wide-angle scattering (GIWAXS), respectively. strongly influenced...

A polymer (PBDTPF-DTBT) was designed and synthesized, which exhibited high photovoltaic performance with PCE = 7.02%.

Benzodithiophene (BDT) and benzothiadiazole (BT) based small molecules have been synthesized through palladium-catalyzed Stille coupling reactions. The with without the conjugated thiophene side-chain were named as DRTBTTBDTT (2D) DRTBTTBDT (1D), respectively. These exhibited an optical band gap of around 1.8 eV. Solution-processed thin films 1D 2D showed that oriented to produce a uniform structure, which led relatively high hole mobility 0.016 cm2 V−1 s−1, this was one highest values for...

Three new conjugated microporous polymers are synthesized with high CO₂ and H₂ uptake great CO₂/CH₄ selectivity.

The layer-by-layer process method, which had been used to fabricate a bilayer or bulk heterojunction organic solar cell, was developed highly efficient ternary blend cells in small molecules and polymers act as two donors. active layer could be formed by incorporating the into polymer based via method: were first coated on surface of poly(3,4-ethylenedioxy-thiophene):poly(styrenesulfonate) ( PSS), then mixed solution fullerene derivative spin-coated top molecule layer. In this crystalline...

A novel donor–acceptor (D–A) copolymer (P3TBDTDTBT), including hyperconjugated side chained benzodithiophene as a donor and 4,7-di-2-thienyl-2,1,3-benzothiadiazole (DTBT) an acceptor, was designed synthesized. Due to the introduction of chain, resultant polymer exhibited good thermal stability with high decomposition temperature 437 °C, low band-gap 1.67 eV absorption onset 742 nm in solid film, deep highest occupied molecular orbital (HOMO) energy level −5.26 eV. Finally, solar cell (PSC)...

Two indacenodithiophene-based molecules with different side chains, BTIDT-C6 and BTIDT-OC12, have been designed synthesized for solution-processed, small-molecule organic solar cells (OSCs) donor materials. By optimizing the hole mobility of materials is modulated, which has proven by field-effect transistor (OFET) performances. Solar based on show a power conversion efficiency (PCE) 4.83%. To best our knowledge, this first report about indacenodithiophene-based, OFETs, it also one highest...

In order to improve the solution processability of 4,7-bis(thiophen-2-yl)benzo[c][1,2,5]thiadiazole (DTBT)-based polymers, novel donor-acceptor polymer PTOBDTDTBT containing DTBT and benzo[1,2-b:4,5-b']dithiophene (BDT) with conjugated side chain is designed synthesized narrow band gap 1.67 eV low lying HOMO energy level -5.4 eV. The blend film PC71 BM exhibits uniform smooth root-mean-square (RMS) surface roughness 1.15 nm because excellent solubility when six octyloxy chains are...

A new alkoxyphenyl substituted benzo[1,2-<italic>b</italic>:4,5-<italic>b</italic>′]dithiophene-based small molecule was designed and synthesized for solution-processed organic solar cells.

Abstract A novel kind of functional organic microporous polymer is designed by introducing polar groups (P=O and P=S) electron‐rich heterocyclic into the framework to obtain high carbon dioxide capture capacity. The estimated Brunauer–Emmett–Teller (BET) surface areas these polymers are about 600 m 2 g −1 highest CO uptake 2.26 mmol (1.0 bar/273 K). Interestingly, containing P=O shows greater capacity than that P=S at same temperature. In addition, show isosteric heats adsorption (28.6 kJ...

An improved photovoltaic performance of quinoxaline-based polymer solar cells was obtained from the view conjugated length and steric hindrance.

A new thiazolothiazole based small molecule (DTTz-DTBTT) has been designed and synthesized. The exhibited good thermal stability excellent solubility. optical gap of DTTz-DTBTT was estimated to be 1.65 eV. solution-processed photovoltaic device on PC61BM a power conversion efficiency 1.64%.