A new conjugated polymer based on 5,7-bis(2-ethylhexyl)benzo[1,2-c:4,5-c′]dithiophene-4,8-dione, named as PBDTBDD, was designed, synthesized, and applied in solar cells (PSCs). power conversion efficiency (PCE) of 6.67% obtained from the PBDTBDD/PC61BM-based PSC, which is a remarkable result for PSCs using PC61BM electron acceptor. The device exhibits narrow absorption band excellent quantum range 500 to 700 nm. Furthermore, PBDTBDD shows strong aggregation effect solution state, study...

The photovoltaic performance of the polymer solar cells (PSCs) based on poly(3-hexylthiophene) (P3HT) as donor and indene-C70 bisadduct (IC70BA) acceptor was optimized by using 3 vol% high boiling point solvent additive 1-chloronaphthalene (CN), N-methyl pyrrolidone (NMP), 1,8-octanedithiol (OT) or 1,8-diiodooctane (DIO) without annealing. PSC P3HT : IC70BA (1 1, w/w) with CN pre-thermal annealing at 150 °C for 10 min, exhibits a power conversion efficiency (PCE) 7.40% Voc 0.87 V, Jsc 11.35...

High-performance inverted polymer solar cells (PSCs) with solution-processed titanium chelate TIPD as electron collecting layer are reported. The power conversion efficiency (PCE) of the PSC a-TIPD buffer thermal annealing at 150 °C for 10 min reached 7.4% under illumination AM1.5, 100 mW/cm2, which is increased by 16% in comparison that (6.4%) device conventional structure. PCE highest among PSCs reported so far literature.

A systematic molecular design process from PBDTTT-S to PBDTDTTT-S-T, a high-performance semiconducting polymer for organic photovoltaics, has been achieved by enhancing structural order, self-assembly and carrier mobility. Solar cells made PBDTDTTT-S-T blended with PC70BM show power conversion efficiency (PCE) of 7.81%, which is 25% higher than that the parent PBDTTT-S. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but...

For the PDPP3T/PCBM system investigated here, atomic force microscopy, resonant soft X-ray scattering, and grazing incidence wide angle scattering are used as an initial set of tools to determine surface texture, bulk compositional morphology, crystallization behavior, respectively. We find systematic variations relate them device performance. A solvent mixture DCB/CF/DIO = 76:19:5 (v/v/v) yields a PCE 6.71%.

The regioregular narrow band gap (E(g) ~1.5 eV) conjugated polymer PIPCP was designed and synthesized. contains a backbone comprised of CPDT-PT-IDT-PT repeat units (CPDT = cyclopentadithiophene, PT pyridyl[2,1,3]thiadiazole, IDT indacenodithiophene) strictly organized orientations, such that the pyridyl N-atoms point toward CPDT fragment. Comparison with regiorandom counterpart PIPC-RA illustrates higher level molecular order translates to power conversion efficiencies (PCEs) when...

A low-bandgap polymer:fullerene blend that has significantly reduced energetic losses from photon absorption to VOC is described. The charge-transfer state and polymer singlet are of nearly equal energy, yet the short-circuit current still reaches 14 mA cm(-2).

Circularly polarized light (CPL)-sensitive direct detection is attracting increasing attention owing to its various optical technology applications and ultracompact device structures. However, current CPL-sensitive mainly focuses on a single mode, whereas the visible-near-infrared (vis-NIR) dual-modal detection, which important for improving sensitivity night-vision performance, still remains be explored. Here, first time, vis-NIR presented in bulk crystals of two-dimensional chiral...

The correlation among molecular conformation, the crystallinity of morphology, propensity for π–π stacking, J- versus H-aggregation, and photovoltaic performance have been studied based on two newly designed polymers, PBDTTT-S-T PDT-S-T. results show that more linear backbone structure is helpful to improve properties polymer, therefore, conformation should be considered design polymers. As a service our authors readers, this journal provides supporting information supplied by authors. Such...

A strong electron-withdrawing group, sulfonyl, was firstly introduced to a semiconducting polymer, PBDTTT-S. The PCE of the PBDTTT-S device reached 6.22% with high open-circuit voltage 0.76 V. sulfonyl group is thus promising candidate as applied high-efficiency PSCs.

A novel solution-processable small molecule, namely, benzo[1,2-b:4,5-b]bis(4,4'-dihexyl-4H-silolo[3,2-b]thiophene-2,2'-diyl)bis(6-fluoro-4-(5'-hexyl-[2,2'-bithiophene]-5-yl)benzo[c][1,2,5]thiadiazole (p-SIDT(FBTTh2)2), was designed and synthesized by utilizing the silaindacenodithiophene (SIDT) framework as central D(2) donor unit within D(1)AD(2)AD(1) chromophore configuration. Relative to widely studied...

A new building block of benzo[1,2-b:4,5-b']difuran (BDF) was firstly designed and synthesized. The newly unit applied for constructing a photovoltaic low band gap polymer, PBDFDTBT, which exhibited promising power conversion efficiency 5.0%.

The addition of small quantities polystyrene (PS) is a simple and economically viable process that improves the power conversion efficiency one most efficient molecule donors. Addition PS increases solution viscosity, thereby providing thicker layers, allows formation desirable bulk heterojunction morphology. Moreover, spontaneously accumulates as phase separated domains, away from electrodes, so not to interfere with charge extraction. As service our authors readers, this journal provides...

High-efficiency bulk heterojunction (BHJ) organic solar cells with power conversion efficiencies of more than 5 % can be fabricated using the green solvent 2-MeTHF. The active layers comprise a blend molecular semiconductor donor intermediate dimensions (X2) and soluble fullerene derivative [6,6]-phenyl-C61 -butyricacidoctylester (PC61 BC8 ). A switch processing from chloroform to 2-MeTHF leads no negative impacts on morphology charge-transport properties optimally performing BHJ films....

Abstract Dynamic covalent bond hydrogels have demonstrated significant application potential in biomedical fields for their dynamic reversibility. However, the contradiction between stability and dynamics of hydrogel restricts its application. Here, utilizing silver sulfadiazine (AgSD) as a catalyst, hyaluronic acid‐based are constructed through imine crosslinking incorporated disulfide bonds within same chain. It is found that AgSD can accelerate formation to improve hydrogels, thereby...

An investigation on the opto-electronic and photovoltaic properties of a pair alkoxy substituted quinoxaline-based copolymers PTTQx is performed in order to describe effect changing position substituents peripheral phenyl rings. The copolymer with meta-positioned showed lower HOMO LUMO levels higher Voc 0.73 V, while para-positioned displayed 0.60 V when polymer/PC71BM blend film was used as active layer polymer solar cells (PSCs) under AM 1.5 G irradiation (100 mW cm−2). With good agreement...

Abstract A pair of polymers, PBDTBT and PBDTDTBT , was synthesized for application in polymer solar cells (PSCs). Although these two polymers have similar absorption bands molecular energy levels, exhibits much better photovoltaic performance cell (PSC) devices with power conversion efficiency (PCE) 7.4%. To understand the differences between we investigated correlations structure, morphology, dynamics polymers. theoretical investigation using density functional theory (DFT) time‐dependent...

The ABC triblock copolymer molecularly displays diverse properties in dilute solution and concentrated at different pH with elevated temperatures.

The structure evolution of regioregular poly(3-hexylthiophene) (P3HT) in THF dilute solution and its influence on thin film morphology were studied by a combination static dynamic laser light scattering (SLS DLS) transmission electron microscopy (TEM). Most P3HT is not directly soluble at room temperature. A thermal treatment high temperature effectively redisperses microsized aggregates, introduces two modes DLS measurement. fast mode with ⟨Rh⟩f ∼ 4 nm unimer coil, while the slow ⟨Rh⟩s∼ 90...