An effective way to improve polymer solar cell efficiency is use a tandem structure, as broader part of the spectrum radiation used and thermalization loss photon energy minimized. In past, lack high-performance low-bandgap polymers was major limiting factor for achieving cell. Here we report development low bandgap (bandgap <1.4 eV), poly[2,7-(5,5-bis-(3,7-dimethyloctyl)-5H-dithieno[3,2-b:2′,3′-d]pyran)-alt-4,7-(5,6-difluoro-2,1,3-benzothia diazole)] with 1.38 eV, high mobility, deep...

Tandem solar cells have the potential to improve photon conversion efficiencies (PCEs) beyond limits of single-junction devices. In this study, a triple-junction tandem design is demonstrated by employing three distinct organic donor materials having bandgap energies ranging from 1.4 1.9 eV. Through optical modeling, balanced absorption rates are achieved and, thereby, photo­currents matched among subcells. Accordingly, an efficient cell can exhibit record-high PCE 11.5%.

A two-dimensional conjugated small molecule (SMPV1) was designed and synthesized for high performance solution-processed organic solar cells. This study explores the photovoltaic properties of this as a donor, with fullerene derivative an acceptor, using solution processing in single junction double tandem The cells based on SMPV1 exhibited certified power conversion efficiency 8.02% under AM 1.5 G irradiation (100 mW cm−2). homo-tandem cell constructed novel interlayer (or tunnel junction)...

The tandem solar cell architecture is an effective way to harvest a broader part of the spectrum and make better use photonic energy than single junction cell. Here, we present design, synthesis, characterization series new low bandgap polymers specifically for polymer cells. These have backbone based on benzodithiophene (BDT) diketopyrrolopyrrole (DPP) units. Alkylthienyl alkylphenyl moieties were incorporated onto BDT unit form BDTT BDTP units, respectively; furan moiety was DPP in place...

Polymer tandem solar cells with 10.2% power conversion efficiency are demonstrated via stacking two PDTP-DFBT:PC71BM bulk heterojunctions, connected by MoO3/PEDOT:PSS/ZnO as an interconnecting layer. The increase the of system from 8.1% to 10.2%, successfully demonstrating polymer identical sub-cells double-digit efficiency. As a service our authors and readers, this journal provides supporting information supplied authors. Such materials peer reviewed may be re-organized for online...

A reduction of the bandgap and an enhancement charge transport properties a LBG polymer (PBDTT-DPP) can be achieved simultaneously by changing sulfur atoms on DPP unit to selenium atoms. The newly designed polymer, PBDTT-SeDPP (Eg = 1.38 eV), shows excellent photovoltaic performance in single junction devices with power conversion efficiencies (PCEs) over 7% photo-response up 900 nm. tandem solar cell visibly transparent based show 9.5% 4.5% PCEs, which are superior those PBDTT-DPP. As...

We describe the detailed synthesis and characterization of an electron-rich building block, dithienopyran (DTP), its application as a donor unit in low-bandgap conjugated polymers. The electron-donating property DTP was found to be strongest among most frequently used units such benzodithiophene (BDT) or cyclopentadithiophene (CPDT) units. When polymerized with strongly electron-deficient difluorobenzothiadiazole (DFBT) unit, regiorandom polymer (PDTP–DFBT, bandgap = 1.38 eV) obtained. For...

ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionSynthesis of 5H-Dithieno[3,2-b:2′,3′-d]pyran as an Electron-Rich Building Block for Donor–Acceptor Type Low-Bandgap PolymersLetian Dou, Chun-Chao Chen, Ken Yoshimura*, Kenichiro Ohya, Wei-Hsuan Chang, Jing Gao, Yongsheng Liu, Eric Richard, and Yang Yang*Cite this: Macromolecules 2013, 46, 11, 4734Publication Date (Web):May 22, 2013Publication History Published online22 May 2013Published inissue 11...

In this study we employed tandem device architectures to tune the external appearance and light-conversion properties of polymer solar cells (PSCs) from visibly transparent semi-transparent, making them more versatile for integrated photovoltaic applications efficient under illumination. Our best cell was a PSC exhibiting an efficiency 6.4% maximum transmission 51% at 550 nm; in contrast, semi-transparent having average 30% visible range exhibited greater than 7%.

Improving the short-circuit current density (<italic>J</italic>_sc) is a big challenge for gaining highly efficient nonfullerene all-small-molecule organic solar cells (NFASM-OSCs).

Using a triple component random copolymerization approach, the amount of triethylene glycol (TEG) side chain, which can be regarded as stack-inducing agent, is introduced precisely into given polymer backbone. TEG chains result in more favorable morphology polymer:fullerene blend. Based on low-bandgap photovoltaic PBDTT-DPP (PBD), this methodology bring 10% overall improvement power conversion efficiency (PCE).

In this work, we have investigated a quaternary ammonium compound that exhibits excellent antimicrobial activity and can be permanently grafted to substrates containing C–H bonds form durable polymeric film within 1 min. The consists of biocidal component, dodecyl-alkylated ammonium, benzophenone moiety that, under mild UV irradiation, generates densely cross-linked network covalently attaches variety substrates, including plastics, fabrics, alkyl-modified glass surfaces. surface attachment...

The power conversion efficiency (PCE) of a DPP-based polymer solar cell is significantly improved by using DIO or DCB as processing additives. discovery that outperforms with wider solvent mixture operation window suggests different optimization mechanisms. Although both systems involve double aggregation processes, including similar solution-to-film aggregation, however, two distinct solution-stage aggregations are observed: relatively amorphous aggregates form in the CF-DIO solution, while...

Poly quaternary "-oniums" derived from polyethylenimine (PEI), poly(vinyl-N-alkylpyridinium), or chitosan belong to a class of cationic polymers that are efficient antimicrobial agents. When dissolved in solution, the positively charged polycations able displace divalent cations cellular phospholipid bilayer and disrupt ionic cross-links structural integrity membrane. However, when immobilized surface where confinement limits diffusion, poly -oniums still show excellent activity, which...

A series of low‐bandgap polymers based on thienyl benzodithiophene (BDTT) and furan‐substituted diketopyrrolopyrrole (FDPP) units with different side chains are presented. By replacing the branched ethylhexyl group FDPP unit linear chains, structural order carrier mobility modified enhanced accordingly. The power conversion efficiencies (PCE) single‐junction devices this improved from ≈5% to ≈7%. More importantly, made show excellent photovoltaic performance a thick active layer up 360 nm,...

In this work, a series of copolymer/silica nanocomposites are investigated that exhibit excellent anti-icing behavior and can be covalently grafted to any substrate containing C–H bonds with high durability.

Purpose Guided by the cognitive-affective system theory of personality (CAPS), this study aims to investigate parallel mediating effects cognitive and affective cynicism on relationship between illegitimate tasks employees’ adaptive performance. It also proposes growth need strength as a moderating variable for relationships Design/methodology/approach Using time-lagged design, data were gathered from 330 frontline hotel employees in China. Findings The authors found that presence is...

A small molecule (<bold>3BDT-5</bold>)-based organic solar cell with <bold>Y6</bold> as an acceptor exhibits a PCE breaking 10% without extra treatment.

Development of perovskite solar cell is very fast in recent years due to its low cost and high photoelectric conversion efficiency.The generally composed by the compact nanocrystalline layer, light absorber CH 3 NH PbX (X= Cl, Br, I), hole transporting counter electrode.Among these components, species preparation techniques, material structure design device are most important factors, which directly affect photovoltaic performances cells.This paper summarizes effect light-absorbers,...

Surface-initiated ring-opening polymerization (SI-ROP) of polycaprolactone (PCL) and polylactide (PLA) polymer brushes with controlled degradation rates were prepared on oxide substrates. PCL polymerized from hydroxyl-terminated monolayers utilizing triazabicyclodecene (TBD) as the catalyst. A consistent brush thickness 40 nm could be achieved a reproducible unique crystalline morphology. The organocatalyzed chain extended using lactide in presence zirconium n-butoxide to successfully grow...