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https://www.readbyqxmd.com/read/29215760/synergistic-effects-of-selenophene-and-extended-ladder-type-donor-units-for-efficient-polymer-solar-cells
#1
Hua-Chun Wang, Qing-Ya Li, Hong-Bo Yin, Xiancheng Ren, Kai Yao, Yonghao Zheng, Yun-Xiang Xu
Two pairs of polymer donor materials based on indacenodithiophene (IDT) and indacenodithieno[3,2-b]thiophene (IDTT) as the donor units are synthesized. Thiophene or selenophene is introduced as the π-bridge units and electron-deficient fluorine-substituted quinoxaline is used as acceptor unit. Selenophene-containing polymers PIDT-DFQ-Se and PIDTT-DFQ-Se show redshifted absorption and narrower bandgaps. Combined with IDTT donor unit, PIDTT-DFQ-Se shows the highest absorption coefficient. Both the IDTT unit and selenophene unit have positive effects on the hole mobilities, making PIDTT-DFQ-Se the highest one...
December 7, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29214697/incorporation-of-2-6-connected-azulene-units-into-the-backbone-of-conjugated-polymers-towards-high-performance-organic-optoelectronic-materials
#2
Xike Gao, Hanshen Xin, Congwu Ge, Xuechen Jiao, Xiaodi Yang, Kira Rundel, Chris McNeill
Azulene is considered to be a promising candidate for constructing optoelectronic materials. We present herein an effective strategy to obtain high performance conjugated polymers by incorporating 2,6-connected azulene units into the polymeric backbone, and two conjugated copolymers P(TBAzDI-TPD) and P(TBAzDI-TFB) are designed and synthesized based on this strategy. They are the first two examples for 2,6-connected azulene-based conjugated polymers and exhibit unipolar n-type transistor performance with an electron mobility of up to 0...
December 7, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29210561/a-dual-function-of-uv-ozone-plasma-treated-polymer-in-polymer-metal-hybrid-electrodes-and-semitransparent-polymer-solar-cells
#3
Wenhao Zheng, Yuanbao Lin, Yangdong Zhang, Junyu Yang, Zuosheng Peng, Alei Liu, Fengling Zhang, Lintao Hou
In this work, high performance inverted indium tin oxide (ITO)-free semitransparent polymer solar cells (PSCs) are comprehensively investigated using a novel polymer/metal hybrid transparent electrode. The electrical and optical characteristics of hybrid electrodes are significantly enhanced by introducing UV/ozone plasma treatment on the polymer poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN), which is functioned as both a seed layer for ultrathin Ag metal electrode and an optical spacer for transparent devices...
December 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29206027/impact-of-acceptor-fluorination-on-the-performance-of-all-polymer-solar-cells
#4
Kedar D Deshmukh, Rukiya Matsidik, Shyamal Prasad, Naresh Chandrasekaran, Adam Welford, Luke A Connal, Amelia C Y Liu, Eliot Gann, Lars Thomsen, Dinesh Kabra, Justin M Hodgkiss, Michael Sommer, Christopher R McNeill
Here we systematically study the effect of fluorination on the performance of all-polymer solar cells employing a naphthalene diimide (NDI) based polymer acceptor with thiophene-flanked phenyl co-monomer. Fluorination of the phenyl co-monomer with either 2 or 4 fluorine units is used to create a series of acceptor polymers with either no fluorination (PNDITPhT) bi-fluorination (PNDITF2T) or tetra-fluorination (PNDITF4T). In blends with the donor polymer PTB7-Th, fluorination results in an increase in power conversion efficiency from 3...
December 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29201609/a-new-electron-acceptor-with-meta-alkoxyphenyl-side-chain-for-fullerene-free-polymer-solar-cells-with-9-3-efficiency
#5
Zhenzhen Zhang, Liuliu Feng, Shutao Xu, Ye Liu, Hongjian Peng, Zhi-Guo Zhang, Yongfang Li, Yingping Zou
A new small molecule acceptor, m-ITIC-OR, based on indacenodithieno[3,2-b]thiophene core with meta-alkoxyphenyl side chains, is designed and synthesized. The m-ITIC-OR film shows broader and redshift absorption compared to its solution and matched energy levels with a hexafluoroquinoxaline-based polymer donor-HFQx-T. Here, polymer solar cells (PSCs) by blending an HFQx-T donor and an m-ITIC-OR acceptor as an active layer deliver the power conversion efficiency (PCE) of 6.36% without any posttreatment. The investigations demonstrate that the HFQx-T:m-ITIC-OR blend films possess higher and more balanced charge mobility, negligible bimolecular recombination, and nanoscale interpenetrating morphology after thermal annealing (TA) treatment...
November 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/29200264/fully-coated-semitransparent-organic-solar-cells-with-a-doctor-blade-coated-composite-anode-buffer-layer-of-phosphomolybdic-acid-and-pedot-pss-and-a-spray-coated-silver-nanowire-top-electrode
#6
J I Guoqi, Yiying Wang, Qun Luo, Kang Han, Menglan Xie, Lianping Zhang, Na Wu, Jian Lin, Shugang Xiao, Yanqing Li, Liqiang Luo, Chang-Qi Ma
Aiming to realize high performance semitransparent fully coated organic solar cells, printable electrode buffer layers and top electrodes are two important key technologies. An ideal ink for the preparation of the electrode buffer layer for printed top electrodes should have good wettability and negligible solvent corrosion to the underlying layer. This work reports a novel organic-inorganic composite of phosphomolybdic acid (PMA) and PEDOT:PSS that features excellent wettability with the active layer and printed top Ag nanowires, and high resistibility to solvent corrosion...
December 4, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29199422/-double-cable-conjugated-polymers-with-linear-backbone-toward-high-quantum-efficiencies-in-single-component-polymer-solar-cells
#7
Guitao Feng, Junyu Li, Fallon J M Colberts, Mengmeng Li, Jianqi Zhang, Fan Yang, Yingzhi Jin, Fengling Zhang, René A J Janssen, Cheng Li, Weiwei Li
A series of "double-cable" conjugated polymers were developed for application in efficient single-component polymer solar cells, in which high quantum efficiencies could be achieved due to the optimized nanophase separation between donor and acceptor parts. The new double-cable polymers contain electron-donating poly(benzodithiophene) (BDT) as linear conjugated backbone for hole transport and pendant electron-deficient perylene bisimide (PBI) units for electron transport, connected via a dodecyl linker. Sulfur and fluorine substituents were introduced to tune the energy levels and crystallinity of the conjugated polymers...
December 4, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29190065/effects-of-inserting-thiophene-as-%C3%AF-bridge-on-the-properties-of-naphthalene-diimide-alt-fused-thiophene-copolymers
#8
Jing Yang, Bo Xiao, Soo Won Heo, Keisuke Tajima, Fan Chen, Erjun Zhou
Based on naphthalene diimide (NDI) unit connected through a thiophene (T) as π-bridge with thiophenes (T), thienothiephene (TT) and dithienothiophene (DTT) units, three new copolymers of PDTNDI-T, PDTNDI-TT and PDTNDI-DTT, respectively, are synthesized and applied to all polymer solar cells (all-PSCs). The relationship among the strucutures, optoelectronic properties and photovoltaic performance as the electron acceptor in all-PSC was compared in detail. As the copolymazied heteroaromatic rings in the DTNDI-based polymers become larger, the power conversion efficiency (PCE) of all-PSC decreased...
November 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29188719/improved-carrier-transport-in-perovskite-solar-cells-probed-by-femtosecond-transient-absorption-spectroscopy
#9
Efthymis Serpetzoglou, Ioannis Konidakis, George Kakavelakis, Temur Maksudov, Emmanuel Kymakis, Emmanuel Stratakis
CH3NH3PbI3 perovskite thin films have been deposited on glass/indium tin oxide (ITO)/Hole Transport Layer (HTL) substrates, utilizing two different materials as the HTLs. In the first configuration the super hydrophilic polymer poly (3,4-ethylenedioxythiophene)-poly (styrenesulfonate), known as PEDOT:PSS, was employed as the HTL material, while on the second case the non-wetting poly (triarylamine) semiconductor polymer, known as PTAA was used. It was found that when PTAA is used as HTL material the averaged power conversion efficiency (PCE) of the perovskite solar cells remarkably increases from 12...
November 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29188708/the-role-of-polymer-segregation-on-the-mechanical-behavior-of-all-polymer-solar-cell-active-layers
#10
Nrup Balar, Yuan Xiong, Long Ye, Sunsun Li, Daniel Nevola, Daniel B Dougherty, Jianhui Hou, Harald Ade, Brendan T O'Connor
An all-polymer bulk heterojunction (BHJ) active layer that removes the use of commonly used small molecule electron acceptors is a promising approach to improve the thermomechanical behavior of organic solar cells. However, there has been limited research on their mechanical properties. Here, we report on the mechanical behavior of high performance blade coated all-polymer BHJ films cast using eco-friendly solvents. The mechanical properties considered include the elastic modulus, crack onset strain, and cohesive fracture energy...
November 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29186235/coating-zno-nanoparticle-films-with-dna-nanolayers-for-enhancing-the-electron-extracting-properties-and-performance-of-polymer-solar-cells
#11
Janardan Dagar, Guido Scavia, Manuela Scarselli, Silvia Destri, Maurizio De Crescenzi, Thomas M Brown
Here we present for the first time polymer solar cells that incorporate biological material that show state of the art efficiencies in excess of 8%. The performance of inverted polymer solar cells was improved significantly after deposition of ZnO nanoparticles (ZnO-NPs) together with a thin deoxyribonucleic acid nanolayer and used as an electron extraction layer (EEL). The ZnO-NPs/DNA double layer improved the rectifying ratio, shunt resistance of the cells as well as lowering the work function of the electron-collecting contact...
November 29, 2017: Nanoscale
https://www.readbyqxmd.com/read/29183108/enhanced-efficiency-and-long-term-stability-of-perovskite-solar-cells-by-synergistic-effect-of-non-hygroscopic-doping-in-conjugated-polymer-based-hole-transporting-layer
#12
Chang Woo Koh, Jin Hyuck Heo, Mohammad Afsar Uddin, Young-Wan Kwon, Dong Hoon Choi, Sang Hyuk Im, Han Young Woo
A face-on oriented and p-doped semi-crystalline conjugated polymer, poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]-thiadiazole)] (PPDT2FBT) was studied as a hole-transport layer (HTL) in methylammonium lead triiodide (MAPbI3)-based perovskite solar cells (PVSCs). PPDT2FBT exhibits a mid-band gap (1.7 eV), high vertical hole mobility (7.3 × 10-3 cm2/Vs), and well-aligned frontier energy levels with a perovskite layer for efficient charge transfer/transport, showing a maximum power conversion efficiency (PCE) of 16...
November 29, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29179799/additives-hole-transporting-materials-and-spectroscopic-methods-to-characterize-the-properties-of-perovskite-films
#13
Amita Ummadisingu, Ji-Youn Seo, Marko Stojanovic, Shaik M Zakeeruddin, Michael Grätzel, Anders Hagfeldt, Nick Vlachopoulos, Michael Saliba
The achievement of high efficiency and high stability in perovskite solar cells (PSCs) requires optimal selection and evaluation of the various components. After a brief introduction to the perovskite materials and their historical evolution, the first part is devoted to the hole transporting material (HTM), between photoelectrode and dark counter electrode. The basic requirements for an efficient HTM are stated. Subsequently, the most used HTM, spiro-OMeTAD, is compared to alternative HTMs, both small-molecule size species and electronically conducting polymers...
November 29, 2017: Chimia
https://www.readbyqxmd.com/read/29172426/diblock-copolymer-pf-b-pdmaema-as-effective-cathode-interfacial-material-in-polymer-solar-cells
#14
Ligang Yuan, Jie Li, Zhao-Wei Wang, Peng Huang, Kai-Cheng Zhang, Yanfeng Liu, Kai Zhu, Zhendong Li, Tiantian Cao, Bin Dong, Yi Zhou, Mi Zhou, Bo Song, Yongfang Li
An alcohol-soluble diblock copolymer poly[2,7-(9,9-dihexylfluorene)]15-block-poly[2-(dimethylamino)ethyl methacrylate]75 (denoted as PF15-b-PDMAEMA75) was employed as cathode interfacial layer (CIL) in p-i-n polymer solar cells (PSCs). PF15-b-PDMAEMA75 contains a conjugated rigid block and a non-conjugated flexible block grafted with polar amino groups, and can effectively lower the work function of Al cathode, and decrease series resistance of the devices. When being applied as CILs in PSCs based on PTB7-Th:PC71BM, the champion power conversion efficiency of 8...
November 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29171705/broadening-the-photoresponse-to-near-infrared-region-by-cooperating-fullerene-and-nonfullerene-acceptors-for-high-performance-ternary-polymer-solar-cells
#15
Jinyan Li, Hao Liu, Zhaoyang Wang, Yiming Bai, Lin Liu, Fuzhi Wang, Tasawar Hayat, Ahmed Alsaedi, Zhan'ao Tan
Ternary polymer solar cells (PSCs) based on multiple materials with level matching and complementary absorptions are regarded as an efficient way to overcome the light-harvesting restriction to surpass high-performance binary PSCs. This study introduces the third component, nonfullerene acceptor IEICO, into binary PSC-based PBDTBDD:PC71 BM to fabricate ternary PSC with one donor and two acceptors. By carefully tuning the third component ratio and cathode engineering, the resulting ternary PSC shows a power conversion efficiency of 10...
November 24, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29171694/multifunctional-diketopyrrolopyrrole-based-conjugated-polymers-with-perylene-bisimide-side-chains
#16
Cheng Li, Changshi Yu, Wenbin Lai, Shijie Liang, Xudong Jiang, Guitao Feng, Jianqi Zhang, Yunhua Xu, Weiwei Li
Two conjugated polymers based on diketopyrrolopyrrole (DPP) in the main chain with different content of perylene bisimide (PBI) side chains are developed. The influence of PBI side chain on the photovoltaic performance of these DPP-based conjugated polymers is systematically investigated. This study suggests that the PBI side chains can not only alter the absorption spectrum and energy level but also enhance the crystallinity of conjugated polymers. As a result, such polymers can act as electron donor, electron acceptor, and single-component active layer in organic solar cells...
November 24, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29171600/photo-degradation-of-high-efficiency-fullerene-free-polymer-solar-cells
#17
Mushfika Baishakhi Upama, Matthew Wright, Md Arafat Mahmud, Naveen Kumar Elumalai, Arman Mahboubi Soufiani, Dian Wang, Cheng Xu, Ashraf Uddin
Polymer solar cells are a promising technology for the commercialization of low cost, large scale organic solar cells. With the evolution of high efficiency (>13%) non-fullerene polymer solar cells, the stability of the cells has become a crucial parameter to be considered. Among the several degradation mechanisms of polymer solar cells, burn-in photo-degradation is relatively less studied. Herein, we present the first systematic study of photo-degradation of novel PBDB-T:ITIC fullerene-free polymer solar cells...
November 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/29170455/ultrafast-bridge-planarization-in-donor-%C3%AF-acceptor-copolymers-drives-intramolecular-charge-transfer
#18
Palas Roy, Ajay Jha, Vineeth B Yasarapudi, Thulasi Ram, Boregowda Puttaraju, Satish Patil, Jyotishman Dasgupta
Donor-π-acceptor conjugated polymers form the material basis for high power conversion efficiencies in organic solar cells. Large dipole moment change upon photoexcitation via intramolecular charge transfer in donor-π-acceptor backbone is conjectured to facilitate efficient charge-carrier generation. However, the primary structural changes that drive ultrafast charge transfer step have remained elusive thereby limiting a rational structure-function correlation for such copolymers. Here we use structure-sensitive femtosecond stimulated Raman spectroscopy to demonstrate that π-bridge torsion forms the primary reaction coordinate for intramolecular charge transfer in donor-π-acceptor copolymers...
November 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/29165989/bispentafluorophenyl-containing-additive-enhancing-efficiency-and-morphological-stability-of-polymer-solar-cells-via-hand-grabbing-like-supramolecular-pentafluorophenyl-fullerene-interactions
#19
Kai-En Hung, Che-En Tsai, Shao-Ling Chang, Yu-Ying Lai, U-Ser Jeng, Fong-Yi Cao, Chain-Shu Hsu, Chun-Jen Su, Yen-Ju Cheng
A new class of additive materials bis(pentafluorophenyl) diesters (BFEs) where the two pentafluorophenyl (C6F5) moieties are attached at the both ends of a linear aliphatic chain with tunable tether lengths (BF5, BF7, and BF13) were designed and synthesized. In the presence of the BF7 to restrict the migration of fullerene by hand-grabbing-like supramolecular interactions induced between the C6F5 groups and the surface of fullerene, the P3HT:PC61BM:BF7 device showed stable device characteristics after thermal heating at 150 oC for 25 h...
November 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29165983/incorporating-electrode-modification-layer-with-vertical-phase-separated-photoactive-layer-for-efficient-and-stable-inverted-nonfullerene-polymer-solar-cells
#20
Zhenzhen Shi, Hao Liu, Yaping Wang, Jinyan Li, Yiming Bai, Fuzhi Wang, Xingming Bian, Tasawar Hayat, Ahmed Alsaedi, Zhan'ao Tan
For bulk heterojunction polymer solar cells (PSCs), the donors and acceptors featuring specific phase separation and concentration distribution within the electron donor:acceptor blends crucially affect the exciton dissociation and charge transportation. Herein, efficient and stable nonfullerene inverted PSCs incorporating phase separated photoactive layer and titanium chelate electrode modification layer are demonstrated. Water contact angle (WCA), scanning kelvin probe microscopy (SKPM), and atomic force microscopy (AFM) techniques are implemented to characterize the morphology of photoactive layers...
November 22, 2017: ACS Applied Materials & Interfaces
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