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https://www.readbyqxmd.com/read/28102611/realizing-small-energy-loss-of-0-55-ev-high-open-circuit-voltage-1-v-and-high-efficiency-10-in-fullerene-free-polymer-solar-cells-via-energy-driver
#1
Pei Cheng, Mingyu Zhang, Tsz-Ki Lau, Yao Wu, Boyu Jia, Jiayu Wang, Cenqi Yan, Meng Qin, Xinhui Lu, Xiaowei Zhan
A new, easy, and efficient approach is reported to enhance the driving force for charge transfer, break tradeoff between open-circuit voltage and short-circuit current, and simultaneously achieve very small energy loss (0.55 eV), very high open-circuit voltage (>1 V), and very high efficiency (>10%) in fullerene-free organic solar cells via an energy driver.
January 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28098970/strong-enhancement-of-photoelectric-conversion-efficiency-of-co-hybridized-polymer-solar-cell-by-silver-nanoplates-and-core-shell-nanoparticles
#2
Wenfei Shen, Jianguo Tang, Yao Wang, Jixian Liu, Linjun Huang, Weichao Chen, Lanlan Yang, Wei Wang, Yanxin Wang, Renqiang Yang, Jungheum Yun, Laurence A Belfiore
A new way was meticulously designed to utilize the localized surface plasmon resonance (LSPR) effect and the light scattering effect of silver nanoplate (Ag-nPl) and core-shell Ag@SiO2 nanoparticles (Ag@SiO2-NPs) to enhance the photovoltaic performances of polymer solar cells (PSCs). To prevent direct contact between silver nanoparticles (Ag-NPs) and photo-active materials which will cause electrons quenching, bare Ag-nPl were spin-coated on indium tin oxide and silica capsulated Ag-NPs were incorporated to PBDTTT-C-T:PC71BM active layer...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094499/organic-solar-cells-with-controlled-nanostructures-based-on-microphase-separation-of-fullerene-attached-thiophene-selenophene-heteroblock-copolymers
#3
Peihong Chen, Kyohei Nakano, Kaori Suzuki, Kazuhito Hashimoto, Tomoka Kikitsu, Daisuke Hashizume, Tomoyuki Koganezawa, Keisuke Tajima
Heteroblock copolymers consisting of poly(3-hexylthiophene) and fullerene-attached poly(3-alkylselenophene) (T-b-Se-PCBP) were synthesized for organic photovoltaic applications by quasi-living catalyst transfer polycondensation and subsequent conversion reactions. Characterization of the polymers confirmed the formation of well-defined diblock structures with high loading of the fullerene at the side chain (~40 wt%). Heteroblock copolymer cast as a thin film showed a clear microphase-separated nanostructure approximately 30 nm in repeating unit after thermal annealing, which is identical to the microphase-separated nanostructure of diblock copolymer consisting of poly(3-hexylthiophene) and fullerene-attached poly(3-alkylthiophene) (T-b-T-PCBP)...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28080058/fabrication-of-pedot-nanocone-arrays-with-electrochemically-modulated-broadband-antireflective-properties
#4
Seulgi So, Han Wai Millie Fung, Kellen Kartub, Adam M Maley, Robert M Corn
Ordered nanocone arrays of the electroactive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) were fabricated by the simultaneous oxygen plasma etching of an electrodeposited PEDOT thin film coated with a hexagonally closed packed polystyrene bead monolayer. PEDOT nanocone arrays with an intercone spacing of 200 nm and an average nanocone height of 350 nm exhibited a low broadband reflectivity of <1.5% from 550 to 800 nm. Electrochemical modulation of the oxidation state of the PEDOT nanocone array film was used to change both its ex situ absorption spectrum (electrochromism) and reflection spectrum (electroreflectivity)...
January 13, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28078339/simultaneous-topographical-electrical-and-optical-microscopy-of-optoelectronic-devices-at-the-nanoscale
#5
Naresh Kumar, Alina Zoladek-Lemanczyk, Anne A Y Guilbert, Weitao Su, Sachetan M Tuladhar, Thomas Kirchartz, Bob C Schroeder, Iain McCulloch, Jenny Nelson, Debdulal Roy, Fernando A Castro
Novel optoelectronic devices rely on complex nanomaterial systems where the nanoscale morphology and local chemical composition are critical to performance. However, the lack of analytical techniques that can directly probe these structure-property relationships at the nanoscale presents a major obstacle to device development. In this work, we present a novel method for non-destructive, simultaneous mapping of the morphology, chemical composition and photoelectrical properties with <20 nm spatial resolution by combining plasmonic optical signal enhancement with electrical-mode scanning probe microscopy...
January 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28075549/solvent-morphology-property-relationship-of-ptb7-pc71bm-polymer-solar-cells
#6
Shuai Guo, Weijia Wang, Eva M Herzig, Anna Naumann, Gregory Tainter, Jan Perlich, Peter Muller-Buschbaum
The influence of three different solvents and a solvent additive on the morphology and photovoltaic performance of bulk heterojunction films made of the copolymer based on thieno[3,4-b]thiophene-alt-benzodithiophene unit PTB7-F40 blended with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) is investigated. Optical microscopy and atomic force microscopy (AFM) are combined with X-ray reflectivity (XRR) and grazing incidence small and wide angle X-ray scattering (GISAXS and GIWAXS) enabling the characterization of the morphology of the whole photoactive film...
January 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28075061/constructing-post-permeation-method-to-fabricate-polymer-nanocrystals-hybrid-solar-cells-with-pce-exceeding-6
#7
Xiaohang Du, Qingsen Zeng, Gan Jin, Fangyuan Liu, Tianjiao Ji, Yuanyuan Yue, Yi Yang, Hao Zhang, Bai Yang
A post-permeation method is constructed for fabricating bulk-heterojunction hybrid solar cells. Porous CdTe film is prepared by annealing the mixture solution of aqueous CdTe nanocrystals and cetyltrimethyl ammonium bromide, after which the post-permeation of polymer is employed. By this method, kinds of polymers can be applied regardless of the intermiscibility with the nanoparticles. The inorganic nanocrystals and the polymer can be treated under respective optimized annealing temperatures, which can facilitate the growth of nanocrystals without damaging the polymers...
January 11, 2017: Small
https://www.readbyqxmd.com/read/28072913/chemical-analysis-of-the-interface-in-bulk-heterojunction-solar-cells-by-x-ray-photoelectron-spectroscopy-depth-profiling
#8
Yan Busby, Emil J W List-Kratochvil, Jean-Jacques Pireaux
Despite the wide use of blends combining an organic p-type polymer and molecular fullerene-based electron acceptor, the proper characterization of such bulk heterojunction materials is still challenging. To highlight structure-to-function relations and improve the device performance, advanced tools and strategies need to be developed to characterize composition and interfaces with sufficient accuracy. In this work, high-resolution X-ray photoelectron spectroscopy (XPS) is combined with very low energy argon ion beam sputtering to perform a nondestructive depth profile chemical analysis on full Al/P3HT:PCBM/PEDOT:PSS/ITO (P3HT, poly(3-hexylthiophene); PCBM, [6,6]-phenyl-C61-butyric acid methyl ester; PEDOT, poly(3,4-ethylenedioxythiophene; PSS, polystyrenesulfonate; ITO, indium tin oxide) bulk-heterojunction solar cell device stacks...
January 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28070837/optoelectronic-evaluation-and-loss-analysis-of-pedot-pss-si-hybrid-heterojunction-solar-cells
#9
Zhenhai Yang, Zebo Fang, Jiang Sheng, Zhaoheng Ling, Zhaolang Liu, Juye Zhu, Pingqi Gao, Jichun Ye
The organic/silicon (Si) hybrid heterojunction solar cells (HHSCs) have attracted considerable attention due to their potential advantages in high efficiency and low cost. However, as a newly arisen photovoltaic device, its current efficiency is still much worse than commercially available Si solar cells. Therefore, a comprehensive and systematical optoelectronic evaluation and loss analysis on this HHSC is therefore highly necessary to fully explore its efficiency potential. Here, a thoroughly optoelectronic simulation is provided on a typical planar polymer poly (3,4-ethylenedioxy thiophene):polystyrenesulfonate (PEDOT:PSS)/Si HHSC...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28066506/reduced-voltage-losses-yield-10-efficient-fullerene-free-organic-solar-cells-with-1-v-open-circuit-voltages
#10
D Baran, T Kirchartz, S Wheeler, S Dimitrov, M Abdelsamie, J Gorman, R S Ashraf, S Holliday, A Wadsworth, N Gasparini, P Kaienburg, H Yan, A Amassian, C J Brabec, J R Durrant, I McCulloch
Optimization of the energy levels at the donor-acceptor interface of organic solar cells has driven their efficiencies to above 10%. However, further improvements towards efficiencies comparable with inorganic solar cells remain challenging because of high recombination losses, which empirically limit the open-circuit voltage (Voc) to typically less than 1 V. Here we show that this empirical limit can be overcome using non-fullerene acceptors blended with the low band gap polymer PffBT4T-2DT leading to efficiencies approaching 10% (9...
December 1, 2016: Energy & Environmental Science
https://www.readbyqxmd.com/read/28063301/ru-dye-grafted-cds-and-reduced-graphene-oxide-ru-cds-rgo-composite-an-efficient-and-photo-tuneable-electrode-material-for-solid-state-dye-sensitized-polymer-solar-cells
#11
Erum Nosheen, Syed Mujtaba Shah, Zafar Iqbal
This article provides a facile one step synthesis of CdS (cadmium sulphide) and CdS/rGO (reduced graphene oxide CdS nanocomposites) using DMF (N, N-Dimethyl formamide) both as a solvent and a reducing agent for the reduction of grapheme oxide. XRD (X-ray diffraction), FESEM (Field emission scanning electron microscopy), EDX (Elemental dispersive X-ray analysis), TEM (Transmission electron microscopy), UV-Vis (UV-visible) and Raman spectroscopy have been employed for the characterization of prepared samples...
December 30, 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28059503/fused-nonacyclic-electron-acceptors-for-efficient-polymer-solar-cells
#12
Shuixing Dai, Fuwen Zhao, Qianqian Zhang, Tsz-Ki Lau, Tengfei Li, Kuan Liu, Qidan Ling, Chunru Wang, Xinhui Lu, Wei You, Xiaowei Zhan
We design and synthesize four fused-ring electron acceptors based on 6,6,12,12-tetrakis(4-hexylphenyl)-indacenobis(dithieno[3,2-b;2',3'-d]thiophene) as the electron-rich unit and 1,1-dicyanomethylene-3-indanones with 0 to 2 fluorine substituents as the electron-deficient units. These four molecules exhibit broad (550-850 nm) and strong absorption with high extinction coefficients of (2.1-2.5) ×10(5) M(-1) cm(-1). Fluorine substitution down shifts LUMO energy level, red shift absorption spectrum, and enhance electron mobility...
January 6, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28058645/efficient-organic-inorganic-hybrid-solar-cell-integrating-polymer-nanowires-and-inorganic-nanotetrapods
#13
Weizhe Xu, Furui Tan, Xiansheng Liu, Weifeng Zhang, Shengchun Qu, Zhijie Wang, Zhanguo Wang
Constructing a highly efficient bulk-heterojunction is of critical importance to the hybrid organic/inorganic solar cells. Here in this work, we introduce a novel hybrid architecture containing P3HT nanowire and CdSe nanotetrapod as bicontinuous charge channels for holes and electrons, respectively. Compared to the traditionally applied P3HT molecules, the well crystallized P3HT nanowires qualify an enhanced light absorption at the long wavelength as well as strengthened charge carrier transport in the hybrid active layer...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28054077/fullerene-free-polymer-solar-cells-processed-from-non-halogenated-solvents-in-air-with-pce-of-4-8
#14
Sergey V Dayneko, Arthur D Hendsbee, Gregory C Welch
Progress towards practical organic solar cells amenable to large scale production is reported. Fullerene-free organic solar cells with a PCE of ∼4.8% are achieved based upon an active layer composed of the standard donor polymer PTB7-Th and a highly soluble twisted PDI acceptor tPDI-Hex. All devices can be fabricated and tested in air with 'as-cast' active layers being processed from the greener solvents o-xylene (or trimethyl benzene) or the eco-friendly and bio-derived solvent 2Me-THF without loss in efficiency...
January 5, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28045489/imidazole-functionalized-fullerene-as-a-vertically-phase-separated-cathode-interfacial-layer-of-inverted-ternary-polymer-solar-cells
#15
Dan Li, Qing Liu, Jieming Zhen, Zhimin Fang, Xiang Chen, Shangfeng Yang
By using a facile one-pot nucleophilic addition reaction, we synthesized a novel imidazole (IMZ)-functionalized fullerene (C60-IMZ), and applied it as a third component of inverted ternary polymer solar cells (PSCs), leading to dramatic efficiency enhancement. According to FT-IR, XPS spectroscopic characterizations and elemental analysis, the chemical structure of C60-IMZ was determined with the average IMZ addition number estimated to be six. The lowest unoccupied molecular orbital (LUMO) level of C60-IMZ measured by cyclic voltammetry was -3...
January 3, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28036127/molecular-engineering-of-conjugated-polymers-for-solar-cells-an-updated-report
#16
Shengqiang Xiao, Qianqian Zhang, Wei You
The device efficiency of polymer:fullerene bulk heterojunction solar cells has recently surpassed 11%, as a result of synergistic efforts among chemists, physicists, and engineers. Since polymers are unequivocally the "heart" of this emerging technology, their design and synthesis have consistently played the key role in the device efficiency enhancement. In this article, the first focus is a discussion on molecular engineering (e.g., backbone, side chains, and substituents), then the discussion moves on to polymer engineering (e...
December 30, 2016: Advanced Materials
https://www.readbyqxmd.com/read/28035966/direct-arylation-strategies-in-the-synthesis-of-%C3%AF-extended-monomers-for-organic-polymeric-solar-cells
#17
REVIEW
Andrea Nitti, Riccardo Po, Gabriele Bianchi, Dario Pasini
π-conjugated macromolecules for organic polymeric solar cells can be rationally engineered at the molecular level in order to tune the optical, electrochemical and solid-state morphology characteristics, and thus to address requirements for the efficient solid state device implementation. The synthetic accessibility of monomers and polymers required for the device is getting increasing attention. Direct arylation reactions for the production of the π-extended scaffolds are gaining importance, bearing clear advantages over traditional carbon-carbon forming methodologies...
December 26, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28024326/surpassing-the-exciton-diffusion-limit-in-single-walled-carbon-nanotube-sensitized-solar-cells
#18
Ghada I Koleilat, Michael Vosgueritchian, Ting Lei, Yan Zhou, Debora W Lin, Franziska Lissel, Pei Lin, John W F To, Tian Xie, Kemar England, Yue Zhang, Zhenan Bao
Semiconducting single-walled carbon nanotube (s-SWNT) light sensitized devices, such as infrared photodetectors and solar cells, have recently been widely reported. Despite their excellent individual electrical properties, efficient carrier transport from one carbon nanotube to another remains a fundamental challenge. Specifically, photovoltaic devices with active layers made from s-SWNTs have suffered from low efficiencies caused by three main challenges: the overwhelming presence of high-bandgap polymers in the films, the weak bandgap offset between the LUMO of the s-SWNTs and the acceptor C60, and the limited exciton diffusion length from one SWNT to another of around 5 nm that limits the carrier extraction efficiency...
December 27, 2016: ACS Nano
https://www.readbyqxmd.com/read/28004908/triumphing-over-charge-transfer-limitations-of-pedot-nanofiber-reduction-catalyst-by-1-2-ethanedithiol-doping-for-quantum-dot-solar-cells
#19
Tea-Yon Kim, Tae Kyung Lee, Byung Su Kim, Seul Chan Park, Sungjin Lee, Seung Soon Im, Juan Bisquert, Yong Soo Kang
Charge transfer between a conducting polymer-based counter electrode (CE) and a polysulfide (S(2-)/Sn(2-)) electrolyte mediator is a key limitation to improvements of solar energy conversion efficiency (ECE) in quantum-dot-sensitized solar cells (QDSCs). In this paper, 1,2-ethanedithiol (EDT) was doped into nanofibrous poly(3,4-ethylenedioxythiophene) (PEDOT NF) to overcome the charge transfer limitation between PEDOT NF and S(2-)/Sn(2-). EDT not only helps to reduce the aggregation and thus enhance the linearization of the PEDOT chains but also changes the molecular conformation of the PEDOT chains from a benzoid to a quinoid structure...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28001036/high-performance-solution-processed-single-junction-polymer-solar-cell-achievable-by-post-treatment-of-pedot-pss-layer-with-water-containing-methanol
#20
Weiping Li, Xinliang Zhang, Xin Zhang, Jiannian Yao, Chuanlang Zhan
PSS (poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)) is widely used as the hole-transporting layer for fabrication of new-generation solar cells. Herein, we utilize water-containing methanol to post-treat the PEDOT:PSS surface, by which the insulating PSS component is partially washed out with the PEDOT-to-PSS weight ratio increasing from 1:6.79 to 1:2.93. As a result, the surface becomes more covered with the electrically conductive PEDOT nanodomains, and again the mean current of the conductive nanodomains increases slightly from 6...
January 18, 2017: ACS Applied Materials & Interfaces
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