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https://www.readbyqxmd.com/read/29677127/direct-hetero-arylation-polymerization-of-a-spirobifluorene-and-a-dithienyl-diketopyrrolopyrrole-derivative-new-donor-polymers-for-organic-solar-cells
#1
Pierre Josse, Sergey Dayneko, Yangqian Zhang, Sylvie Dabos-Seignon, Shiming Zhang, Philippe Blanchard, Gregory C Welch, Clément Cabanetos
The synthesis and preliminary evaluation as donor material for organic photovoltaics of the poly(diketopyrrolopyrrole-spirobifluorene) ( PDPPSBF ) is reported herein. Prepared via homogeneous and heterogeneous direct (hetero)arylation polymerization (DHAP), through the use of different catalytic systems, conjugated polymers with comparable molecular weights were obtained. The polymers exhibited strong optical absorption out to 700 nm as thin-films and had appropriate electronic energy levels for use as a donor with PC70 BM ...
April 20, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29673207/direct-hetero-arylation-for-the-synthesis-of-molecular-materials-coupling-thieno-3-4-c-pyrrole-4-6-dione-with-perylene-diimide-to-yield-novel-non-fullerene-acceptors-for-organic-solar-cells
#2
Thomas A Welsh, Audrey Laventure, Gregory C Welch
Herein we report on the synthesis of an N -annulated perylene diimide (PDI) disubstituted thieno[3,4-c]pyrrole-4,6-dione (TPD) molecular acceptor (PDI-TPD-PDI) by direct heteroarylation (DHA) methods. Three sets of DHA conditions that explore the effects of solvent, temperature, and catalyst were employed to find the optimal conditions for the synthesis of two PDI-TPD-PDI derivatives. We then selected one PDI-TPD-PDI for use as a non-fullerene acceptor in organic solar cell devices with the donor polymer PBDB-T...
April 17, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29671565/perylene-diimide-based-zwitterion-as-the-cathode-interlayer-for-high-performance-nonfullerene-polymer-solar-cells
#3
Changjian Song, Xiaohui Liu, Xiaodong Li, Ying-Chiao Wang, Li Wan, Xiaohua Sun, Wenjun Zhang, Junfeng Fang
Nonfullerene polymer solar cells (PSCs) have earned widespread and intense interest on account of their properties such as tunable energy levels, potential for low-cost production processes, reduced energy losses, and strong light absorption coefficients. Here, a water-/alcohol-soluble zwitterion perylene diimide zwitterion (PDI-z) consisted of sulfobetaine ion as a terminal substituent and PDI as a conjugated core was synthesized. PDI-z was employed as an electron-transport layer (ETL) for nonfullerene PSC devices, obtaining an optimal power conversion efficiency (PCE) above 11...
April 19, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29670943/molecular-engineered-conjugated-polymer-with-high-thermal-conductivity
#4
Yanfei Xu, Xiaoxue Wang, Jiawei Zhou, Bai Song, Zhang Jiang, Elizabeth M Y Lee, Samuel Huberman, Karen K Gleason, Gang Chen
Traditional polymers are both electrically and thermally insulating. The development of electrically conductive polymers has led to novel applications such as flexible displays, solar cells, and wearable biosensors. As in the case of electrically conductive polymers, the development of polymers with high thermal conductivity would open up a range of applications in next-generation electronic, optoelectronic, and energy devices. Current research has so far been limited to engineering polymers either by strong intramolecular interactions, which enable efficient phonon transport along the polymer chains, or by strong intermolecular interactions, which enable efficient phonon transport between the polymer chains...
March 2018: Science Advances
https://www.readbyqxmd.com/read/29665119/blade-cast-nonfullerene-organic-solar-cells-in-air-with-excellent-morphology-efficiency-and-stability
#5
Lin Zhang, Baojun Lin, Bo Hu, Xianbin Xu, Wei Ma
Blade-coating serving as a prototype tool for slot-die coating can be very compatible with large-area roll-to-roll coating. Using blade-coating in an ambient environment, an average power conversion efficiency (PCE) of 10.03% is achieved in nonfullerene organic solar cells, which is higher than that of the optimal spin-coated device with a PCE of 9.41%. It is demonstrated that blade-coating can induce a higher degree of molecular packing for both conjugated polymer donors and small-molecular acceptors as it helps to produce a seeding film containing numerous crystal grains, subsequently providing nucleation sites for the residual solution when the motion of the blade exposes a liquid front...
April 17, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29660294/high-performance-all-polymer-solar-cells-achieved-by-fused-perylenediimide-based-conjugated-polymer-acceptors
#6
Yuli Yin, Jing Yang, Fengyun Guo, Erjun Zhou, Liancheng Zhao, Yong Zhang
We report three n-type polymeric electron acceptors (PFPDI-TT, PFPDI-T and PFPDI-Se) based on the fused perylene diimide (FPDI) and thieno[3,2-b]thiophene, thiophene or selenophene units for all-polymer solar cells (all-PSCs). These FPDI-based polymer acceptors exhibit the strong absorption between 350 nm and 650 nm with the wide optical badgaps of 1.86~1.91 eV, showing good absorption compensation with the narrow bangap polymer donor. The lowest unoccupied molecular orbital (LUMO) energy levels were located at around -4...
April 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29652470/fabrication-and-characterization-of-hybrid-organic-inorganic-electron-extraction-layers-for-polymer-solar-cells-towards-improved-processing-robustness-and-air-stability
#7
Donia Fredj, Florent Pourcin, Riva Alkarsifi, Volkan Kilinc, Xianjie Liu, Sadok Ben Dkhil, Nassira Chniba Boudjada, Mats Fahlman, Christine Videlot-Ackermann, Olivier Margeat, Jörg Ackermann, Mohamed Boujelbene
Organic-inorganic hybrid materials composed of bismuth and diaminopyridine are studied as novel materials for electron extraction layers in polymer solar cells using regular device structures. The hybrid materials are solution processed on top of two different low band gap polymers (PTB7 or PTB7-Th) as donor materials mixed with fullerene PC70BM as acceptor. The intercalation of the hybrid layer between the photo-active layer and the Aluminum cathode leads to solar cells with power conversion efficiency of 7...
April 13, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29648797/theoretical-modeling-of-singlet-fission
#8
David Casanova
Singlet fission is a photophysical reaction in which a singlet excited electronic state splits into two spin-triplet states. Singlet fission was discovered more than 50 years ago, but the interest in this process has gained a lot of momentum in the past decade due to its potential as a way to boost solar cell efficiencies. This review presents and discusses the most recent advances with respect to the theoretical and computational studies on the singlet fission phenomenon. The work revisits important aspects regarding electronic states involved in the process, the evaluation of fission rates and interstate couplings, the study of the excited state dynamics in singlet fission, and the advances in the design and characterization of singlet fission compounds and materials such as molecular dimers, polymers, or extended structures...
April 12, 2018: Chemical Reviews
https://www.readbyqxmd.com/read/29626389/efficient-and-stable-inverted-planar-perovskite-solar-cells-using-a-triphenylamine-hole-transporting-material
#9
Rui Chen, Tongle Bu, Jing Li, Wei Li, Peng Zhou, Xueping Liu, Zhiliang Ku, Jie Zhong, Yong Peng, Fuzhi Huang, Yi-Bing Cheng, Zhengyi Fu
Inverted perovskite solar cells (PSCs) with a structure of p-i-n have attracted great attention. Normally, inorganic p-type metal oxides or polymers have been used as hole transport layer (HTL), a vital component in the inverted PSCs. However, they either need a high processing temperature, or are quite expensive. While for the traditional HTL, PEDOT:PSS, it is sensitive to humidity and thus detrimental to the stability of the PSCs. Herein, we employed a small molecule, 4, 4´, 4´´-tris (N-3-methylphenyl-N-phenylamino) triphenyl amine (m-MTDATA) to replace the PEDOT:PSS as a new HTL for the inverted PSCs...
April 6, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29616240/a-fluorene-core-based-electron-acceptor-for-fullerene-free-bhj-organic-solar-cells-towards-power-conversion-efficiencies-over-10
#10
Suman, Anirban Bagui, Ashish Garg, Barkha Tyagi, Vinay Gupta, Surya Prakash Singh
A small molecule non-fullerene electron acceptor (SMNFEA), bearing a furan π-spacer and dicyano-n-hexyl rhodanine as flanking groups, was designed and synthesized for organic solar cell applications. Organic photovoltaic devices based on FRdCN2 and PTB7-Th polymer donors exhibited a highly improved efficient power conversion efficiency of 10.7%, which is the highest so far for OSCs fabricated from fluorene-core-based SMNFEAs.
April 4, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29609286/comparison-of-metal-polymer-back-reflectors-with-half-sphere-blazed-and-pyramid-gratings-for-light-trapping-in-iii-v-solar-cells
#11
Timo Aho, Mircea Guina, Farid Elsehrawy, Federica Cappelluti, Marianna Raappana, Antti Tukiainen, A B M Khairul Alam, Ismo Vartiainen, Markku Kuittinen, Tapio Niemi
We report on the fabrication of diffraction gratings for application as back contact reflectors. The gratings are designed for thin-film solar cells incorporating absorbers with bandgap slightly lower than GaAs, i.e. InAs quantum dot or GaInNAs solar cells. Light trapping in the solar cells enables the increase of the absorption leading to higher short circuit current densities and higher efficiencies. We study metal/polymer back reflectors with half-sphere, blazed, and pyramid gratings, which were fabricated either by photolithography or by nanoimprint lithography...
March 19, 2018: Optics Express
https://www.readbyqxmd.com/read/29602243/over-14-efficiency-in-polymer-solar-cells-enabled-by-a-chlorinated-polymer-donor
#12
Shaoqing Zhang, Yunpeng Qin, Jie Zhu, Jianhui Hou
Fluorine-contained polymers, which have been widely used in highly efficient polymer solar cells (PSCs), are rather costly due to their complicated synthesis and low yields in the preparation of components. Here, the feasibility of replacing the critical fluorine substituents in high-performance photovoltaic polymer donors with chlorine is demonstrated, and two polymeric donors, PBDB-T-2F and PBDB-T-2Cl, are synthesized and compared in parallel. The synthesis of PBDB-T-2Cl is much simpler than that of PBDB-T-2F...
March 30, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29582026/light-trapping-in-thin-film-silicon-solar-cells-via-phase-separated-disordered-nanopillars
#13
Yidenekachew J Donie, Michael Smeets, Amos Egel, Florian Lentz, Jan B Preinfalk, Adrian Mertens, Vladimir Smirnov, Uli Lemmer, Karsten Bittkau, Guillaume Gomard
In this work, we have improved the absorption properties of thin film solar cells by introducing light trapping reflectors deposited onto self-assembled nanostructures. The latter consist of a disordered array of nanopillars and are fabricated by polymer blend lithography. Their broadband light scattering properties are exploited to enhance the photocurrent density of thin film devices, here based on hydrogenated amorphous silicon active layers. We demonstrate that these light scattering nanopillars yield a short-circuit current density increase of +33%rel with respect to equivalent solar cells processed on a planar reflector...
March 27, 2018: Nanoscale
https://www.readbyqxmd.com/read/29575107/nonfullerene-tandem-organic-solar-cells-with-high-performance-of-14-11
#14
Yamin Zhang, Bin Kan, Yanna Sun, Yanbo Wang, Ruoxi Xia, Xin Ke, Yuan-Qiu-Qiang Yi, Chenxi Li, Hin-Lap Yip, Xiangjian Wan, Yong Cao, Yongsheng Chen
Fabricating solar cells with tandem structure is an efficient way to broaden the photon response range without further increasing the thermalization loss in the system. In this work, a tandem organic solar cell (TOSC) based on highly efficient nonfullerene acceptors (NFAs) with series connection type is demonstrated. To meet the different demands of front and rear sub-cells, two NFAs named F-M and NOBDT with a whole absorption range from 300 to 900 nm are designed, when blended with wide bandgap polymer poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c:4',5'-c']dithiophene-4,8-dione))] (PBDB-T) and narrow bandgap polymer PTB7-Th, respectively, the PBDB-T: F-M system exhibits a high Voc of 0...
March 25, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29573008/naphtho-1-2-b-5-6-b-dithiophene-based-conjugated-polymers-for-fullerene-free-inverted-polymer-solar-cells
#15
Zhaoyan Jiang, Huan Li, Zhen Wang, Jianqi Zhang, Yajie Zhang, Kun Lu, Zhixiang Wei
Three novel copolymers based on zigzag naphthodithiophene (zNDT) with different aromatic rings as π bridges and different core side substitutions are designed and synthesized (PzNDT-T-1,3-bis(4-(2-ethylhexyl)-thiophen-2-yl)-5,7-bis(2-ethylhexyl)benzo[1,2-c:4,5-c']-dithiophene-4,8-dione (BDD), PzNDT-TT-BDD, and PzNDTP-T-BDD, respectively). The 2D conjugation structure and molecular planarity of the polymers can be effectively altered through the modification of conjugated side chains and π-bridges. These alterations contribute to the variation in energy levels, light absorption capacity, and morphology compatibility of the polymers...
March 23, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29571214/high-performance-additive-post-treatment-free-nonfullerene-polymer-solar-cells-via-tuning-molecular-weight-of-conjugated-polymers
#16
Zelin Li, Dalei Yang, Tong Zhang, Jidong Zhang, Xiaoli Zhao, Xiaoniu Yang
In recent years, rapid advances are achieved in polymer solar cells (PSCs) using nonfullerene small molecular acceptors. However, no research disclosing the influence of molecular weight (Mn ) of conjugated polymer on the nonfullerene device performance is reported. In this work, a series of polymers with different Mn s are synthesized to systematically investigate the connection between Mn and performance of nonfullerene devices for the first time. It is found that the device performance improves substantially as the Mn increases from 12 to 38 kDa and a power conversion efficiency (PCE) as high as 10...
March 23, 2018: Small
https://www.readbyqxmd.com/read/29569898/boosting-light-harvesting-in-perovskite-solar-cells-by-biomimetic-inverted-hemispherical-architectured-polymer-layer-with-high-haze-factor-as-an-antireflective-layer
#17
Dong Hyun Kim, Bhaskar Dudem, Jae Woong Jung, Jae Su Yu
Biomimetic micro architectured polymer layers such as inverted hemispherical architectured (IHSA)-polydimethylsiloxane (PDMS) and hemispherical architectured (HSA)-PDMS layers were developed by a simple and cost-effective soft imprinting lithography method via a hexagonal close-packed polystyrene microsphere arrays/silicon mold. However, the IHSA-PDMS/glass possessed superior antireflection (AR) characteristics with the highest/lowest average transmittance/reflectance (Tavg/Ravg) values of approximately 89...
March 23, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29561034/impact-of-the-solubility-of-organic-semiconductors-for-solution-processable-electronics-on-the-structure-formation-a-real-time-study-of-morphology-and-electrical-properties
#18
E S Radchenko, D V Anokhin, K L Gerasimov, A I Rodygin, A A Rychkov, E D Shabratova, S Grigorian, D A Ivanov
The control of structure formation in the active layers of organic solar cells allows for improvement in their processability and enhancement of the efficiency of the final devices. In the present work, in situ studies of film formation from binary toluene solutions of an electron donor, poly(3-hexylthiophene) (P3HT), and an electron acceptor such as [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) or indene-C60 bisadduct (ICBA) have been conducted. These experiments were carried out using GIWAXS with simultaneous electric current measurements...
March 21, 2018: Soft Matter
https://www.readbyqxmd.com/read/29559737/top-down-approaches-towards-single-crystal-perovskite-solar-cells
#19
Johannes Schlipf, Abdelrahman M Askar, Florian Pantle, Benjamin D Wiltshire, Anton Sura, Peter Schneider, Linus Huber, Karthik Shankar, Peter Müller-Buschbaum
Solar cells employing hybrid perovskites have proven to be a serious contender versus established thin-film photovoltaic technologies. Typically, current photovoltaic devices are built up layer by layer from a transparent substrate (bottom-up approach), while the deposition of the perovskite layer itself comes with many challenges including the control of crystal size, nucleation density and growth rate. On the other hand, single crystals have been used with great success for studying the fundamental properties of this new class of optoelectronic materials...
March 20, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29557657/nonfullerene-acceptor-molecules-for-bulk-heterojunction-organic-solar-cells
#20
Guangye Zhang, Jingbo Zhao, Philip C Y Chow, Kui Jiang, Jianquan Zhang, Zonglong Zhu, Jie Zhang, Fei Huang, He Yan
The bulk-heterojunction blend of an electron donor and an electron acceptor material is the key component in a solution-processed organic photovoltaic device. In the past decades, a p-type conjugated polymer and an n-type fullerene derivative have been the most commonly used electron donor and electron acceptor, respectively. While most advances of the device performance come from the design of new polymer donors, fullerene derivatives have almost been exclusively used as electron acceptors in organic photovoltaics...
March 20, 2018: Chemical Reviews
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