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https://www.readbyqxmd.com/read/28731343/-roller-wheel-pt-containing-small-molecules-and-the-impact-of-rollers-on-material-crystallinity-electronic-properties-and-solar-cell-performance
#1
Wenhan He, Maksim Y Livshits, Diane A Dickie, Zhen Zhang, Luis E Mejiaortega, Jeffrey J Rack, Qin Wu, Yang Qin
We report the synthesis, characterization and detailed comparison of a series of novel Pt-bisacetylide containing conjugated small molecules possessing an unconventional "roller-wheel" shaped structure that is distinctly different from the "dumbbell" designs in traditional Pt-bisacetylide containing conjugated polymers and small molecules. The relationship between the chemical nature and length of the "rollers" and the electronic and physical properties of the materials are carefully studied by steady state spectroscopy, cyclic voltammetry, differential scanning calorimetry, single-crystal X-ray diffraction, transient absorption spectroscopy, theoretical calculation and device application...
July 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28731322/large-scale-stretchable-semi-embedded-copper-nanowires-transparent-conductive-films-by-electrospinning-template
#2
Xia Yang, Xiaotian Hu, Qingxia Wang, Jian Xiong, Hanjun Yang, Xiangchuan Meng, Licheng Tan, Lie Chen, Yiwang Chen
With recent emergence of wearable electronic devices, the flexible and stretchable transparent electrodes are the core components to realize innovative devices. Copper nanowires (CuNWs) network is commonly chosen because of its high conductivity and transparency. However, the junction resistances and low aspect ratios still limit its further stretchable performance. Herein, a large-scale stretchable semi-embedded CuNWs transparent conductive film (TCFs) was fabricated by electrolessly depositing Cu on the electrospun poly (4-vinylpyridine) (P4VP) polymer template semi-embedded in polydimethylsiloxane (PDMS)...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28727458/unraveling-the-high-voc-and-high-performance-of-integrated-perovskite-organic-bulk-heterojunction-solar-cells
#3
Shiqi Dong, Yongsheng Liu, Ziruo Hong, En-Ping Yao, Pengyu Sun, Lei Meng, Yuze Lin, Jinsong Huang, Gang Li, Yang Yang
We have demonstrated high performance integrated perovskite/bulk-heterojunction (BHJ) solar cells due to the low carrier recombination velocity, high open circuit voltage (Voc) and increased light absorption ability in near-infrared (NIR) region of integrated devices. In particular, we find that the Voc of the integrated devices is dominated by (or pinned to) the perovskite cells, not the OPV cells. A Quasi-Fermi Level Pinning Model was proposed to understand the working mechanism and the origin of the Voc of the integrated perovskite/BHJ solar cell, which following that of the perovskite solar cell and is much higher than that of the low bandgap polymer based organic BHJ solar cell...
July 20, 2017: Nano Letters
https://www.readbyqxmd.com/read/28718618/graphene-oxide-by-uv-ozone-treatment-as-efficient-hole-extraction-layer-for-highly-efficient-and-stable-polymer-solar-cells
#4
Yingdong Xia, Yufeng Pan, Haijuan Zhang, Jian Qiu, Yiting Zheng, YongHua Chen, Wei Huang
Hole extraction layer has significant impact on achieving high-efficiency polymer solar cells (PSCs). Here, we report an efficient approach to by direct UV-Ozone treatment larger device performance enhancement employing grapheme oxide (GO). The dramatically performance enhancement of PSCs with P3HT:PCBM blend as an active layer was demonstrated by UV-Ozone treated GO for 30 min: best PCE of 4.18%, FF of 0.63, Jsc of 10.94 mA cm-2, and Voc of 0.61 V, which is significantly higher than the untreated GO (1.82%) and highly comparable PEDOT:PSS-based PSCs (3...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28718290/enhanced-long-term-and-thermal-stability-of-polymer-solar-cells-in-air-at-high-humidity-with-the-formation-of-unusual-quantum-dot-networks
#5
Long Tan, Fan Yang, Mee Rahn Kim, Pandeng Li, Deepak Thrithamarassery Gangadharan, Joelle Margot, Ricardo Izquierdo, Mohamed Chaker, Dongling Ma
Due to the practical applications of polymer solar cells (PSCs), their stability recently has received increasing attention. Herein, a new strategy was developed to largely enhance the long-term and thermal stability of PSCs in air with a relatively high humidity of 50-60% without any encapsulation. In this strategy, semiconductor PbS/CdS core/shell quantum dots (QDs) were incorporated into the photoactive blend of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM). By replacing the initial ligands of oleic acid with halide ligands on the surface of PbS/CdS QDs via solution-phase-ligand-exchange, we were able to form unusual, continuous QD networks in the film of P3HT:PCBM, which effectively stabilized the photoactive layer...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28710572/tuning-the-electronic-and-optical-properties-of-ndt-based-conjugated-polymers-by-adopting-fused-heterocycles-as-acceptor-units-a-theoretical-study
#6
Na Cheng, Changqiao Zhang, Yongjun Liu
Donor-acceptor conjugated polymers have been successfully applied in bulk heterojunction solar cell devices. Tuning their donor and acceptor units allows the design of new polymers with desired electronic and optical properties. Here, to screen new candidate polymers based on a newly synthesized donor unit, dithieo[2,3-d:2',3'-d']naphtho[1,2-b:3,4-b']dithiophene (NDT), a series of model polymers with different acceptor units were designed and denoted NDT-A0 to NDT-A12, and the structures and optical properties of those polymers were investigated using DFT and TDDFT calculations...
August 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28708387/role-of-triplet-state-shelving-in-organic-photovoltaics-single-chain-aggregates-of-poly-3-hexylthiophene-versus-mesoscopic-multichain-aggregates
#7
Florian Steiner, John M Lupton, Jan Vogelsang
Triplet excitons have been the focus of considerable attention with regards to the functioning of polymer solar cells because these species are long-lived and quench subsequently generated singlet excitons in their vicinity. The role of triplets in poly(3-hexylthiophene) (P3HT) has been investigated extensively with contrary conclusions regarding their importance. We probe the various roles triplets can play in P3HT by analyzing the photoluminescence (PL) from isolated single-chain aggregates and multichain mesoscopic aggregates...
July 14, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28696657/a-3d-structural-model-of-high-performance-non-fullerene-polymer-solar-cells-as-revealed-by-high-resolution-afm
#8
Shaowei Shi, Xiaofeng Chen, Xubo Liu, Xuefei Wu, Feng Liu, Zhi-Guo Zhang, Yongfang Li, Thomas P Russell, Dong Wang
Rapid improvements in non-fullerene polymer solar cells (PSCs) have brought power conversion efficiencies to over 12%. To further improve device performance, a fundamental understanding of the correlations between structure and performance is essential. In this paper, based on a typical high performance system consisting of J61(one donor-acceptor (D-A) copolymer of benzodithiophene and fluorine substituted benzotriazole) and ITIC (3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone)-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2',3'-d']-s-indaceno[1,2-b:5,6-b']-dithiophene), a 3D-structural model is directly imaged by employing high resolution atomic force microscopy (AFM)...
July 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28696442/reducing-hole-transporter-use-and-increasing-perovskite-solar-cell-stability-with-dual-role-polystyrene-microgel-particles
#9
Mu Chen, Muhamad Z Mokhtar, Eric Whittaker, Qing Lian, Bruce Hamilton, Paul O'Brien, Mingning Zhu, Zhengxing Cui, Saif A Haque, Brian R Saunders
Perovskite solar cells (PSCs) are a disruptive technology that continues to attract considerable attention due to their remarkable and sustained power conversion efficiency increase. Improving PSC stability and reducing expensive hole transport material (HTM) usage are two aspects that are gaining increased attention. In a new approach, we investigate the ability of insulating polystyrene microgel particles (MGs) to increase PSC stability and replace the majority of the HTM phase. MGs are sub-micrometre crosslinked polymer particles that swell in a good solvent...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28696123/determining-the-true-optical-gap-in-a-high-performance-organic-photovoltaic-polymer-using-single-molecule-spectroscopy
#10
Gordon J Hedley, Florian Steiner, Jan Vogelsang, John M Lupton
Low-gap conjugated polymers have enabled an impressive increase in the efficiencies of organic solar cells, primarily due to their red absorption which allows harvesting of that part of the solar spectrum. Here, we report that the true optical gap of one prototypical material, PTB7, is in fact at significantly higher energy than has previously been reported, indicating that the red absorption utilized in these materials in solar cells is entirely due to chain aggregation. Using single-molecule spectroscopy we find that PL from isolated nanoscale aggregates consists of multiple independently emitting chromophores...
July 11, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28688441/nanoscale-investigations-on-interchain-organization-in-thin-films-of-polymer-liquid-crystal-blend
#11
C Villeneuve-Faure, D Le Borgne, V Ventalon, I Seguy, K I Moineau-Chane Ching, E Bedel-Pereira
Optimized nanomorphology in organic thin active layers is crucial for good performance in organic solar cells. However, the relation between morphology and electronic properties at nanoscale remains not completely understood. Here, we study the effect of film thickness and temperature annealing on the ordering of poly(3-hexylthiophene) chains when the polymer is blended with a columnar liquid crystalline molecule. Electronic absorption, atomic force microscopy measurements, and Raman spectroscopy show that morphology and chain ordering of the blend depend on the film thickness...
July 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28687984/comparison-of-the-optoelectronic-performance-of-neutral-and-cationic-forms-of-riboflavin
#12
Gözde Murat Saltan, Deniz Aykut Kıymaz, Ceylan Zafer, Haluk Dinçalp
The riboflavin dye 2,3,4,5-tetra-O-acetyl-1-[3-(6-bromohexyl)-7,8-dimethyl-2,4-dioxo-3,4-dihydrobenzo[g]pteridin-10(2H)-yl]-1-deoxypentitol and its pyridinium salt were synthesized, and studied by absorption and fluorescence spectroscopy in solutions and on thin film states. The first absorption band of riboflavin-pyridinium salt derivative is red-shifted by 10 nm compared to neutral one on film. Cationic riboflavin derivative shows significant wavelength changes on its fluorescence emission spectrum in the excited state depending on the solvent polarity and the electronic environment...
July 7, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28685574/low-cost-and-green-fabrication-of-polymer-electronic-devices-by-push-coating-the-polymer-active-layers
#13
Varun Vohra, Wojciech Mroz, Shusei Inaba, William Porzio, Umberto Giovanella, Francesco Galeotti
Due to both their easy processability and compatibility with roll-to-roll processes, polymer electronics is considered to be the most promising technology for the future generation of low-cost electronic devices such as light-emitting diodes and solar cells. However, the state-of-the-art deposition technique for polymer electronics (spin-coating) generates a high volume of chlorinated solution wastes during the active layer fabrication. Here, we demonstrate that devices with similar or higher performances can be manufactured using the push-coating technique in which a polydimethylsiloxane (PDMS) layer is simply laid over a very small amount of solution (less than 1l/covered cm2) which is then left for drying...
July 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28679036/naphthalene-diimide-based-n-type-polymers-efficient-rear-interlayers-for-high-performance-silicon-organic-heterojunction-solar-cells
#14
Yujie Han, Yuqiang Liu, Jianyu Yuan, Huilong Dong, Youyong Li, Wanli Ma, Shuit-Tong Lee, Baoquan Sun
Silicon (Si)-organic heterojunction solar cells suffer from a noticeable weakness of inefficient rear contact. To improve this rear contact quality, here, two solution-processed organic n-type donor-acceptor naphthalene diimide (NDI)-based conjugated polymers of N2200 and fluorinated analog F-N2200 are explored to reduce the contact resistance as well as to passivate Si surface. Both N2200 and F-N2200 exhibit high electron mobility due to its planar structure and strong intermolecular stacking, thus allow them to act as excellent transporting layers...
July 5, 2017: ACS Nano
https://www.readbyqxmd.com/read/28675932/push-pull-type-non-fullerene-acceptors-for-polymer-solar-cells-effect-of-the-donor-core
#15
Zhenjing Kang, Shan-Ci Chen, Yunlong Ma, Jianbin Wang, Qingdong Zheng
There has been a growing interest in the design and synthesis of non-fullerene acceptors for organic solar cells which may overcome the drawbacks of the traditional fullerene-based acceptors. Herein, two novel push-pull (acceptor-donor-acceptor) type small molecule acceptors, i. e. ITDI and CDTDI, with indenothiophene and cyclopentadithiophene as the core units and 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (INCN) as the end-capping units are designed and synthesized for non-fullerene polymer solar cells (PSCs)...
July 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28664724/analysis-of-interfacial-layer-induced-open-circuit-voltage-burn-in-loss-in-polymer-solar-cells-on-the-basis-of-electroluminescence-and-impedance-spectroscopy
#16
Jaehoon Kim, Heeyoung Jung, Jiyun Song, Kyunghwan Kim, Changhee Lee
Stable and robust open-circuit voltage (VOC) is essential to achieve a long lifetime for polymer solar cells (PSCs). Here, we investigate the VOC burn-in loss mechanism on the basis of the analysis of electroluminescence quantum efficiency (EQEEL) and impedance measurements in amorphous PSCs, with an inverted structure having different electron transport layers (ETLs) of ZnO nanoparticles (NPs) and the sol-gel processed ZnO layer. We found that both charge recombination and energetic disorder account for a substantial proportion of the VOC burn-in loss...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28662740/molecular-strategies-for-morphology-control-in-semiconducting-polymers-for-optoelectronics
#17
Aiman Rahmanudin, Kevin Sivula
Solution-processable semiconducting polymers have been explored over the last decades for their potential applications in inexpensively fabricated transistors, diodes and photovoltaic cells. However, a remaining challenge in the field is to control the solid-state self-assembly of polymer chains in thin films devices, as the aspects of (semi)crystallinity, grain boundaries, and chain entanglement can drastically affect intra-and inter-molecular charge transport/transfer and thus device performance. In this short review we examine how the aspects of molecular weight and chain rigidity affect solid-state self-assembly and highlight molecular engineering strategies to tune thin film morphology...
June 28, 2017: Chimia
https://www.readbyqxmd.com/read/28662333/la0-8sr0-2mno3-based-perovskite-nanoparticles-with-the-a-site-deficiency-as-high-performance-bifunctional-oxygen-catalyst-in-alkaline-solution
#18
Litao Yan, Yue Lin, Xue Yu, Weichuan Xu, Thomas Salas, Hugh Smallidge, Meng Zhou, Hongmei Luo
Perovskite (La0.8Sr0.2)1-xMn1-xIrxO3 (x = 0 (LSM) and 0.05 (LSMI)) nanoparticles with particle size of 20-50 nm are prepared by the polymer-assisted chemical solution method and demonstrated as high performance bifunctional oxygen catalyst in alkaline solution. As compared with LSM, LSMI with the A-site deficiency and the B-site iridium (Ir)-doping has a larger lattice, lower valence state of transition metal, and weaker metal-OH bonding; therefore, it increases the concentration of oxygen vacancy and enhances both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR)...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28661655/enhancing-the-efficiency-of-polymer-solar-cells-by-incorporation-of-2-5-difluorobenzene-units-into-the-polymer-backbone-via-random-copolymerization
#19
Zhe Zhang, Yahui Liu, Jicheng Zhang, Shiyu Feng, Liangliang Wu, Xue Gong, Xinjun Xu, Xuebo Chen, Zhishan Bo
A series of conjugated polymers P0, P5, and P7 containing 0, 5, and 7 mol % 2,5-difluorobenzene units, respectively, were prepared and utilized as electron donors in polymer solar cells. Incorporation of a small amount of 2,5-difluorobenzene unit into the backbone of donor polymers can significantly increase their planarity and crystallinity as well as decrease their solubility. The improved molecular conformation can markedly affect the morphology of polymer:PC71BM blend films. After incorporation of 5 mol % 2,5-difluorobenzene unit into the backbone of donor polymers, the domain size of blend films became smaller and the hole mobility increased...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28658571/triazine-based-polyelectrolyte-as-an-efficient-cathode-interfacial-material-for-polymer-solar-cells
#20
Nallan Chakravarthi, Um Kanta Aryal, Kumarasamy Gunasekar, Ho-Yeol Park, Yeong-Soon Gal, Young-Rae Cho, Seong Il Yoo, Myungkwan Song, Sung-Ho Jin
A novel polyelectrolyte containing triazine (TAZ) and benzodithiophene (BDT) scaffolds with polar phosphine oxide (P═O) and quaternary ammonium ions as pendant groups, respectively, in the polymer backbone (PBTAZPOBr) was synthesized to use it as a cathode interfacial layer (CIL) for polymer solar cell (PSC) application. Owing to the high electron affinity of the TAZ unit and P═O group, PBTAZPOBr could behave as an effective electron transport material. Due to the polar quaternary ammonium and P═O groups, the interfacial dipole moment created by PBTAZPOBr substantially reduced the work function of the metal cathode to afford better energy alignment in the device, thus enabling electron extraction and reducing recombination of excitons at the photoactive layer/cathode interface...
July 11, 2017: ACS Applied Materials & Interfaces
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