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https://www.readbyqxmd.com/read/28422433/rigid-non-fullerene-acceptors-based-on-triptycene-perylene-dye-for-organic-solar-cells
#1
Dong Meng, Huiting Fu, Bingbing Fan, Jianqi Zhang, Yan Li, Yanming Sun, Zhaohui Wang
Three kinds of non-conjugated rigid perylene bisimide (PBI) derivatives based on a triptycene core were designed, synthesized and characterized. The unique three-dimensional (3D) conformation of triptycene could enable formation of polymer with the favorable morphology for organic polymer solar cells (PSCs) by relieving the self-aggregation of rigid PBI units. The low-lying LUMO energy levels of these compounds demonstrated that they are very suitable for using as acceptors in organic solar cells. A higher power conversion efficiency (PCE) of 6...
April 19, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28417116/a-long-persistence-phosphor-tailored-quasi-solid-state-dye-sensitized-solar-cell-that-generates-electricity-in-sunny-and-dark-weathers
#2
Qunwei Tang, Min Wang, Zhongling Wang, Weiyin Sun, Ruoxu Shang
An all-weather quasi-solid-state dye-sensitized solar cell is built using a long persistence phosphor tailored mesoscopic TiO2 photoanode and a three-dimensional conducting polymer gel electrolyte. The so-called all-weather solar cell yields a maximum efficiency of 28.7% in the dark, making a promising photovoltaic revolutionary for state-of-the-art photovoltaics.
April 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28409897/boosting-the-lifetime-and-enhancing-the-efficiency-of-organic-solar-cell-by-applying-an-in-situ-synthesized-low-crystalline-amorphous-zno-layer-as-a-high-potential-buffer-layer
#3
Farzaneh Arabpour Roghabadi, Vahid Ahmadi, Bahram Abdollahi Nejand, Karim Oniy Aghmiuni
By introducing an in situ-synthesized low-crystalline ZnO (LC-ZnO) (amorphous) layer between the cathode and the active layer of PCPDTBT: CdSe solar cell, the device keeps more than 80% and 40% of its initial lifetime after 180 days and 360 days without any encapsulation, respectively. In this regard, 180 days is the highest lifetime achieved for polymer-based solar cells with direct configuration. In addition, the power conversion efficiency (PCE) is improved up to 70% in the presence of the LC-ZnO interfacial layer...
April 14, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28400589/excitation-intensity-dependent-carrier-dynamics-of-chalcogen-heteroatoms-in-medium-bandgap-polymer-solar-cells
#4
Chandramouli Kulshreshtha, Jiwon Son, Torbjörn Pascher, Ji-Hee Kim, Taiha Joo, Jaewon Lee, Mun Seok Jeong, Kilwon Cho
The excitation intensity dependent carrier dynamics of blends with PC[70]BM of three new medium-band gap conjugated polymers with central chalcogen heteroatoms, PBDTfDTBX (X = O, T(Sulphur), Se) were studied. The PBDTfDTBX polymers (Poly[4,8-bis(5-(2-butyloctyl)thiophene-2-yl)benzo[1,2-b;4,5-b']dithiophene-alt-4,7-bis(4-(2-ethylhexyl)-2-thienyl)-dithieno[3',2':3,4;2″,3″:5,6]benzo[1,2-c][1,2,5] furazan or thiadiazole or selenadiazole]) have symmetrical structures but exhibit different solar cell performances...
April 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28399362/insights-into-the-morphological-instability-of-bulk-heterojunction-ptb7-th-pcbm-solar-cells-upon-high-temperature-aging
#5
Yen-Ju Hsieh, Yu-Ching Huang, Wei-Shin Liu, Yu-An Su, Cheng-Si Tsao, Syang-Peng Rwei, Leeyih Wang
The impact of the morphological stability of the donor/acceptor mixture under thermal stress on the photovoltaic properties of bulk heterojunction (BHJ) solar cells based on the poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b']-dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]-thiophene)-2-carboxylate-2,6-diyl]/phenyl-C61-butyric acid methyl ester (PTB7-Th/PC61BM) blend is extensively investigated. Both optical microscopy and transmission electron microscopy micrographs show that long-term high-temperature aging stimulates the formation of microscale clusters, the size of which, however, is about 1 order of magnitude smaller than those observed in thermally annealed poly(3-hexylthiophene)/PC61BM composite film...
April 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28398016/enhancing-performance-of-large-area-organic-solar-cells-with-thick-film-via-ternary-strategy
#6
Jianqi Zhang, Yifan Zhao, Jin Fang, Liu Yuan, Benzheng Xia, Guodong Wang, Zaiyu Wang, Yajie Zhang, Wei Ma, Wei Yan, Wenming Su, Zhixiang Wei
Large-scale fabrication of organic solar cells requires an active layer with high thickness tolerability and the use of environment-friendly solvents. Thick films with high-performance can be achieved via a ternary strategy studied herein. The ternary system consists of one polymer donor, one small molecule donor, and one fullerene acceptor. The small molecule enhances the crystallinity and face-on orientation of the active layer, leading to improved thickness tolerability compared with that of a polymer-fullerene binary system...
April 11, 2017: Small
https://www.readbyqxmd.com/read/28397889/synthetic-approaches-towards-structurally-defined-electrochemically-and-photo-redox-active-polymer-architectures
#7
REVIEW
Robert Schroot, Michael Jäger, Ulrich S Schubert
Electrochemically active polymers are widely used in (opto)electronic applications, e.g. organic light-emitting diodes (OLEDs), organic field-effect transistors (OFETs), solar cells or other light harvesting devices. In this regard, the progress in controlled polymerization techniques opens new possibilities to construct covalently linked polymer architectures, e.g. block copolymers or graft copolymers, from defined building blocks. These architectures represent promising candidates for application in (opto)electronic devices as they allow control of the morphology through self-assembly processes and, furthermore, are capable of mimicking fundamental processes for directional charge transport or light harvesting...
April 11, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28397337/multichannel-interdiffusion-driven-fasni3-film-formation-using-aqueous-hybrid-salt-polymer-solutions-toward-flexible-lead-free-perovskite-solar-cells
#8
Jun Xi, Zhaoxin Wu, Bo Jiao, Hua Dong, Chenxin Ran, Chengcheng Piao, Ting Lei, Tze-Bin Song, Weijun Ke, Takamichi Yokoyama, Xun Hou, Mercouri G Kanatzidis
Tin (Sn)-based perovskites are increasingly attractive because they offer lead-free alternatives in perovskite solar cells. However, depositing high-quality Sn-based perovskite films is still a challenge, particularly for low-temperature planar heterojunction (PHJ) devices. Here, a "multichannel interdiffusion" protocol is demonstrated by annealing stacked layers of aqueous solution deposited formamidinium iodide (FAI)/polymer layer followed with an evaporated SnI2 layer to create uniform FASnI3 films. In this protocol, tiny FAI crystals, significantly inhibited by the introduced polymer, can offer multiple interdiffusion pathways for complete reaction with SnI2 ...
April 11, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28395136/one-pot-large-scale-synthesis-of-carbon-quantum-dots-efficient-cathode-interlayers-for-polymer-solar-cells
#9
Yuzhao Yang, Xiaofeng Lin, Wenlang Li, Jiemei Ou, Zhongke Yuan, Fangyan Xie, Wei Hong, Dingshan Yu, Yuguang Ma, Zhenguo Chi, Xudong Chen
Cathode interlayers (CILs) with low-cost, low-toxicity, and excellent cathode modification ability are necessary for the large-scale industrialization of polymer solar cells (PSCs). In this contribution, we demonstrated one-pot synthesized carbon quantum dots (C-dots) with high production to serve as efficient CIL for inverted PSCs. The C-dots were synthesized by a facile, economical microwave pyrolysis in a household microwave oven within 7 min. Ultraviolet photoelectron spectroscopy (UPS) studies showed that the C-dots possessed the ability to form a dipole at the interface, resulting in the decrease of the work function (WF) of cathode...
April 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28394431/high-performance-long-term-stable-dopant-free-perovskite-solar-cells-and-additive-free-organic-solar-cells-by-employing-newly-designed-multirole-%C3%AF-conjugated-polymers
#10
Kakaraparthi Kranthiraja, Kumarasamy Gunasekar, Hyunji Kim, An-Na Cho, Nam-Gyu Park, Seonha Kim, Bumjoon J Kim, Ryosuke Nishikubo, Akinori Saeki, Myungkwan Song, Sung-Ho Jin
Perovskite solar cells (PSCs) and organic solar cells (OSCs) are promising renewable light-harvesting technologies with high performance, but the utilization of hazardous dopants and high boiling additives is harmful to all forms of life and the environment. Herein, new multirole π-conjugated polymers (P1-P3) are developed via a rational design approach through theoretical hindsight, further successfully subjecting them into dopant-free PSCs as hole-transporting materials and additive-free OSCs as photoactive donors, respectively...
April 10, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28382247/analysis-and-modification-of-defective-surface-aggregates-on-pcdtbt-pcbm-solar-cell-blends-using-combined-kelvin-probe-conductive-and-bimodal-atomic-force-microscopy
#11
Hanaul Noh, Alfredo J Diaz, Santiago D Solares
Organic photovoltaic systems comprising donor polymers and acceptor fullerene derivatives are attractive for inexpensive energy harvesting. Extensive research on polymer solar cells has provided insight into the factors governing device-level efficiency and stability. However, the detailed investigation of nanoscale structures is still challenging. Here we demonstrate the analysis and modification of unidentified surface aggregates. The aggregates are characterized electrically by Kelvin probe force microscopy and conductive atomic force microscopy (C-AFM), whereby the correlation between local electrical potential and current confirms a defective charge transport...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28371487/poly-4-vinylpyridine-based-interfacial-passivation-to-enhance-voltage-and-moisture-stability-of-lead-halide-perovskite-solar-cells
#12
Tsutomu Miyasaka, Bhumika Chaudhary, Ashish Kulkarni, Ajay Kumar Jena, Masashi Ikegami, Yosuke Udagawa, Hideyuki Kunugita, Kazuhiro Ema
It is well known that the surface trap states and electronic disorders in the solution-processed CH3NH3PbI3 perovskite film affect the solar cell performance significantly and moisture sensitivity of photo-active perovskite material limits its practical applications. Herein, we show surface modification of perovskite film with a solution-processable hydrophobic polymer namely poly(4-vinylpyridine) (PVP), which passivates the under-coordinated lead (Pb) atoms (on the surface of perovskite) via its pyridine Lewis base side chains and thereby eliminates surface trap states and non-radiative recombination...
March 29, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28370995/leucine-starch-and-bicarbonate-utilization-by-specific-bacterial-groups-in-surface-shelf-waters-off-galicia-nw-spain
#13
E Teira, V Hernando-Morales, E Guerrero-Feijóo, M M Varela
The capability of different bacterial populations to degrade abundant polymers, such as algal-derived polysaccharides, or to utilize preferentially polymers over monomers, remains largely unknown. In this study, we combined microautoradiography with fluorescence in situ hybridization (MAR-FISH) to evaluate the ability of Bacteroidetes, SAR11, Roseobacter spp, Gammaproteobacteria and SAR86 cells to use bicarbonate, leucine and starch under natural light conditions at two locations in shelf surface waters off NW Spain...
April 3, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28370466/recent-advances-in-wide-bandgap-photovoltaic-polymers
#14
REVIEW
Yunhao Cai, Lijun Huo, Yanming Sun
The past decade has witnessed significant advances in the field of organic solar cells (OSCs). Ongoing improvements in the power conversion efficiency of OSCs have been achieved, which were mainly attributed to the design and synthesis of novel conjugated polymers with different architectures and functional moieties. Among various conjugated polymers, the development of wide-bandgap (WBG) polymers has received less attention than that of low-bandgap and medium-bandgap polymers. Here, we briefly summarize recent advances in WBG polymers and their applications in organic photovoltaic (PV) devices, such as tandem, ternary, and non-fullerene solar cells...
March 29, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28368094/alkenyl-carboxylic-acid-engineering-the-nanomorphology-in-polymer-polymer-solar-cells-as-solvent-additive
#15
Yannan Zhang, Jianyu Yuan, Jianxia Sun, Guanqun Ding, Lu Han, Xufeng Ling, Wanli Ma
We have investigated a series of commercially available alkenyl carboxylic acids with different alkenyl chain lengths (trans-2-hexenoic acid (CA-6), trans-2-decenoic acid (CA-10), 9-tetradecenoic acid (CA-14)) for use as solvent additives in polymer-polymer non-fullerene solar cells. We systematically investigated their effect on the film absorption, morphology, carrier generation, transport, and recombination in all-polymer solar cells. We revealed that these additives have a significant impact on the aggregation of polymer acceptor, leading to improved phase segregation in the blend film...
April 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28364668/towards-designing-polymers-for-photovoltaic-applications-a-dft-and-experimental-study-of-polyazomethines-with-various-chemical-structures
#16
Jacek Wojtkiewicz, Agnieszka Iwan, Marek Pilch, Bartosz Boharewicz, Kamil Wójcik, Igor Tazbir, Maria Kaminska
Theoretical studies of polyazomethines (PAZs) with various chemical structures designated for photovoltaic applications are presented. PAZ energy levels and optical properties were calculated within density-functional theory (DFT and TDDFT) framework for 28 oligomers (monomer, dimer and trimer) of PAZs. The correlations between chemical structure of PAZ and location of its highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels were examined. It turned out that the presence of triaminophenylene, dimethoxydiphenylene and fluorine group raises the orbital energies...
March 19, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28358486/separation-of-semiconducting-carbon-nanotubes-for-flexible-and-stretchable-electronics-using-polymer-removable-method
#17
Ting Lei, Igor Pochorovski, Zhenan Bao
Electronics that are soft, conformal, and stretchable are highly desirable for wearable electronics, prosthetics, and robotics. Among the various available electronic materials, single walled carbon nanotubes (SWNTs) and their network have exhibited high mechanical flexibility and stretchability, along with comparable electrical performance to traditional rigid materials, e.g. polysilicon and metal oxides. Unfortunately, SWNTs produced en masse contain a mixture of semiconducting (s-) and metallic (m-) SWNTs, rendering them unsuitable for electronic applications...
March 30, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28358138/photostability-of-plasma-polymerized-%C3%AE-terpinene-thin-films-for-encapsulation-of-opv
#18
Kateryna Bazaka, Jakaria Ahmad, Michael Oelgemöller, Ashraf Uddin, Mohan V Jacob
Optically transparent, smooth, defect-free, chemically inert and with good adhesion to a variety of substrates, plasma polymers from plant-derived secondary metabolites have been identified as promising encapsulating materials for organic electronics and photovoltaics. Here, we demonstrate that an encapsulating layer of plasma polymerized γ-terpinene reduces degradation-related loss in conversion efficiency in PCPDTBT:PC70BM solar cells under ambient operating conditions. The stability of γ-terpinene films was then investigated under extreme UV irradiation conditions as a function of deposition power...
March 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28345859/aqueous-nanoparticle-polymer-solar-cells-effects-of-surfactant-concentration-and-processing-on-device-performance
#19
Fallon J M Colberts, Martijn M Wienk, René A J Janssen
Polymer solar cells based on PDPP5T and PCBM as donor and acceptor materials, respectively, were processed from aqueous nanoparticle dispersions. Careful monitoring and optimization of the concentration of free and surface-bound surfactants in the dispersion, by measuring the conductivity and ζ-potential, is essential to avoid aggregation of nanoparticles at low concentration and dewetting of the film at high concentration. The surfactant concentration is crucial for creating reproducible processing conditions that aid in further developing aqueous nanoparticle processed solar cells...
April 4, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28341555/enhanced-thermal-stability-of-a-polymer-solar-cell-blend-induced-by-electron-beam-irradiation-in-the-transmission-electron-microscope
#20
Olof Bäcke, Camilla Lindqvist, Amaia Diaz de Zerio Mendaza, Stefan Gustafsson, Ergang Wang, Mats R Andersson, Christian Müller, Per Magnus Kristiansen, Eva Olsson
We show by in situ microscopy that the effects of electron beam irradiation during transmission electron microscopy can be used to lock microstructural features and enhance the structural thermal stability of a nanostructured polymer:fullerene blend. Polymer:fullerene bulk-heterojunction thin films show great promise for use as active layers in organic solar cells but their low thermal stability is a hindrance. Lack of thermal stability complicates manufacturing and influences the lifetime of devices. To investigate how electron irradiation affects the thermal stability of polymer:fullerene films, a model bulk-heterojunction film based on a thiophene-quinoxaline copolymer and a fullerene derivative was heat-treated in-situ in a transmission electron microscope...
March 15, 2017: Ultramicroscopy
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