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https://www.readbyqxmd.com/read/28530404/role-of-crystallization-in-the-morphology-of-polymer-non-fullerene-acceptor-bulk-heterojunctions
#1
Kathryn A O'Hara, David P Ostrowski, Unsal Koldemir, Christopher J Takacs, Sean E Shaheen, Alan Sellinger, Michael L Chabinyc
Many high efficiency organic photovoltaics use fullerene-based acceptors despite their high production cost, weak optical absorption in the visible range, and limited synthetic variability of electronic and optical properties. To circumvent this deficiency, non-fullerene small-molecule acceptors have been developed that have good synthetic flexibility, allowing for precise tuning of optoelectronic properties, leading to enhanced absorption of the solar spectrum and increased open-circuit voltages (VOC). We examined the detailed morphology of bulk heterojunctions of poly(3-hexylthiophene) and the small-molecule acceptor HPI-BT to reveal structural changes that lead to improvements in the fill factor of solar cells upon thermal annealing...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530392/a-hexafluoroquinoxaline-based-polymer-for-nonfullerene-solar-cells-reaching-9-4-efficiency
#2
Shutao Xu, Liuliu Feng, Jun Yuan, Zhi-Guo Zhang, Yongfang Li, Hongjian Peng, Yingping Zou
hrough introducing six fluorine atoms onto quinoxaline (Qx), a new electron acceptor unit-hexafluoroquinoxaline (HFQx) is firstly synthesized. Based on this unit, we synthesize a new donor-acceptor (D-A) copolymer (HFQx-T), which is composed of benzodithiophene (BDT) derivative donor block and an HFQx accepting block. The strong electron-withdrawing properties of fluorine atoms increase significantly the voltage open-circuit (Voc) by tuning the highest occupied molecular orbital (HOMO) energy level. In addition, fluorine atoms enhance the absorption coefficient of the conjugated copolymer and change the film morphology, which implies an increase of the short-circuit current density (Jsc) and fill factor (FF)...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28526863/potential-of-pedot-pss-as-a-hole-selective-front-contact-for-silicon-heterojunction-solar-cells
#3
Sara Jäckle, Martin Liebhaber, Clemens Gersmann, Mathias Mews, Klaus Jäger, Silke Christiansen, Klaus Lips
We show that the highly conductive polymer poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) can successfully be applied as a hole selective front contact in silicon heterojunction (SHJ) solar cells. In combination with a superior electron selective heterojunction back contact based on amorphous silicon (a-Si), mono-crystalline n-type silicon (c-Si) solar cells reach power conversion efficiencies up to 14.8% and high open-circuit voltages exceeding 660 mV. Since in the PEDOT:PSS/c-Si/a-Si solar cell the inferior hybrid junction is determining the electrical device performance we are capable of assessing the recombination velocity (v I ) at the PEDOT:PSS/c-Si interface...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28523914/polymerizable-supramolecular-approach-to-highly-conductive-pedot-pss-patterns
#4
Taegeun Kim, Suryong Ha, Hyosung Choi, Kyungchan Uh, Umesha Kundapur, Sumin Park, Chan Woo Lee, Sang-Hwa Lee, Jaeyong Kim, Jong-Man Kim
Owing to its high conductivity, solution processability, mechanical flexibility and transparency, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been extensively explored for use in functional devices including solar cells, sensors, light emitting diodes and supercapacitors. The ability to fabricate patterned PEDOT:PSS on a solid substrate is of significant importance in order to develop practical applications of this conducting polymer. Herein we describe a new approach to obtain PEDOT:PSS patterns that is based on a polymerizable supramolecular concept...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28514169/engineering-interface-structure-to-improve-efficiency-and-stability-of-organometal-halide-perovskite-solar-cells
#5
Longbin Qiu, Luis K Ono, Yan Jiang, Matthew R Leyden, Sonia R Raga, Shenghao Wang, Yabing Qi
The rapid rise of power conversion efficiency (PCE) of low cost organometal halide perovskite solar cells suggests that these cells are a promising alternative to conventional photovoltaic technology. However, anomalous hysteresis and unsatisfactory stability hinder the industrialization of perovskite solar cells. Interface engineering is of importance for the fabrication of highly stable and hysteresis free perovskite solar cells. Here we report that a surface modification of the widely used TiO2 compact layer can give insight into interface interaction in perovskite solar cells...
May 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28514159/direct-observation-of-an-efficient-triplet-exciton-diffusion-process-in-a-platinum-containing-conjugated-polymer
#6
Lili Du, Wenjuan Xiong, Shun-Cheung Cheng, Haiting Shi, Wai Kin Chan, David Lee Phillips
We report the synthesis and characterization of a conjugated polymer incorporated with cyclometalated platinum complexes on the main chain. The polymer may serve as an efficient triplet sensitizer in light harvesting systems. The photophysical properties of the polymer was studied by nanosecond and femtosecond time resolved transient absorption spectroscopies. After excitation, an energy transfer process from the thiophene units on the conjugated main chain to the singlet excited state of the Pt complex moieties occurred in less than 150 fs...
May 17, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28513158/molecular-optimization-enables-over-13-efficiency-in-organic-solar-cells
#7
Wenchao Zhao, Sunsun Li, Huifeng Yao, Shaoqing Zhang, Yun Zhang, Bei Yang, Jianhui Hou
A new polymer donor (PBDB-T-SF) and a new small molecule acceptor (IT-4F) for fullerene-free organic solar cells (OSCs) were designed and synthesized. The influences of fluorination on the absorption spectra, molecular energy levels, and charge mobilities of the donor and acceptor were systematically studied. The PBDB-T-SF:IT-4F-based OSC device showed a record high efficiency of 13.1%, and an efficiency of over 12% can be obtained with a thickness of 100-200 nm, suggesting the promise of fullerene-free OSCs in practical applications...
May 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28512333/hybrid-organic-tandem-solar-cell-comprising-small-molecule-bottom-and-polymer-fullerene-top-subcells-fabricated-by-thin-film-transfer
#8
Yoonseok Ka, Hyejin Hwang, Changsoon Kim
Multilayer structures involving solution-deposited polymer films are difficult to fabricate, not allowing for unrestricted designs of polymer-based optoelectronic devices required for maximizing their performance. Here, we fabricate a hybrid organic tandem solar cell whose top and bottom subcells have polymer:fullerene and small molecules active layers, respectively, by a solvent-free process based on transferring the polymer:fullerene layer from an elastomeric stamp onto a vacuum-deposited bottom subcell. The interface between small-molecule and transferred polymer:fullerene layers is void-free at the nanoscale, allowing for efficient charge transport across the interface...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28508912/pyrazine-fused-isoindigo-a-new-building-block-for-polymer-solar-cells-with-high-open-circuit-voltage
#9
Jiu-Long Li, Yun-Fei Chai, Wei Vanessa Wang, Zi-Fa Shi, Zhu-Guo Xu, Hao-Li Zhang
Pyrazine-fused isoindigo (PzIIG) was designed and synthesized as a novel electron acceptor to construct two D-A conjugated polymers, PzIIG-BDT2TC8 and PzIIG-BTT2TC10. Both the polymers were successfully applied in polymer solar cells, and the PzIIG-BDT2TC8 based solar cell device exhibited a PCE of 5.26% with a high Voc over 1.0 V.
May 16, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28503056/energy-level-tuning-of-poly-phenylene-alt-dithienobenzothiadiazole-s-for-low-photon-energy-loss-solar-cells
#10
Ruurd Heuvel, Jacobus J van Franeker, René A J Janssen
Six poly(phenylene-alt-dithienobenzothiadiazole)-based polymers have been synthesized for application in polymer-fullerene solar cells. Hydrogen, fluorine, or nitrile substitution on benzo-thiadiazole and alkoxy or ester substitution on the phenylene moiety are investigated to reduce the energy loss per converted photon. Power conversion efficiencies (PCEs) up to 6.6% have been obtained. The best performance is found for the polymer-fullerene combination with distinct phase separation and crystalline domains...
March 2017: Macromolecular Chemistry and Physics
https://www.readbyqxmd.com/read/28499092/determining-the-conduction-band-edge-potential-of-solar-cell-relevant-nb2o5-fabricated-by-atomic-layer-deposition
#11
William L Hoffeditz, Michael J Pellin, Omar K Farha, Joseph T Hupp
Often key to boosting photovoltages in photoelectrochemical and related solar-energy-conversion devices is the preferential slowing of rates of charge recombination - especially recombination at semiconductor/solution, semiconductor/polymer, or semiconductor/perovskite interfaces. In devices featuring TiO2 as the semiconducting component, a common approach to slowing recombination is to install an ultrathin metal-oxide barrier layer or trap-passivating layer atop the semiconductor, with the needed layer often being formed via atomic layer deposition (ALD)...
May 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28497691/fine-tuned-photoactive-and-interconnection-layers-for-achieving-over-13-efficiency-in-a-fullerene-free-tandem-organic-solar-cell
#12
Yong Cui, Huifeng Yao, Bowei Gao, Yunpeng Qin, Shaoqing Zhang, Bei Yang, Chang He, Bowei Xu, Jianhui Hou
Fabricating organic solar cells (OSCs) with a tandem structure has been considered an effective method to overcome the limited light absorption spectra of organic photovoltaic materials. Currently, the most efficient tandem OSCs are fabricated by adopting fullerene-derivatives as acceptors. Here, we design a new NF-acceptor with an E(opt)g of 1.68 eV for the front sub-cells and optimize the phase separation morphology of a fullerene-free active layer with an E(opt)g of 1.36 eV to fabricate the rear sub-cell...
May 12, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28497686/enhancing-the-durability-and-carrier-selectivity-of-perovskite-solar-cells-using-a-blend-interlayer
#13
Dong Hun Sin, Sae Byeok Jo, Seung Goo Lee, Hyomin Ko, Min Kim, Hansol Lee, Kilwon Cho
A mechanically and thermally stable and electron-selective ZnO/CH3NH3PbI3 interface is created via hybridization of a polar insulating polymer, poly(ethylene glycol) (PEG), into ZnO nanoparticles (NPs). PEG successfully passivates the oxygen defects on ZnO and prevents direct contact between CH3NH3PbI3 and defects on ZnO. A uniform CH3NH3PbI3 film is formed on a soft ZnO:PEG layer after dispersion of the residual stress from the volume expansion during CH3NH3PbI3 conversion. PEG also increases the work of adhesion of the CH3NH3PbI3 film on the ZnO:PEG layer and holds the CH3NH3PbI3 film with hydrogen bonding...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28496134/inkjet-printing-of-nio-films-and-integration-as-hole-transporting-layers-in-polymer-solar-cells
#14
Arjun Singh, Shailendra Kumar Gupta, Ashish Garg
Stability concerns of organic solar cell devices have led to the development of alternative hole transporting layers such as NiO which lead to superior device life times over conventional Poly(3,4-ethylenedioxythiophene) Polystyrene sulfonate (PEDOT:PSS) buffered solar cells. From the printability of such devices, it is imperative to be able to print NiO layers in the organic solar cell devices with normal architecture which has so far remained unreported. In this manuscript, we report on the successful ink-jet printing of very thin NiO thin films with controlled thickness and morphology and their integration in organic solar cell devices...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28485918/self-assembled-amphiphilic-block-copolymers-cdte-nanocrystals-for-efficient-aqueous-processed-hybrid-solar-cells
#15
Jun-Huan Li, Yilin Li, Jun-Ting Xu, Christine K Luscombe
Due to their low cost and high efficiency, polymer/nanocrystal hybrid solar cells (HSCs) have attracted much attention in recent years. In this work, water-soluble hybrid materials consisting of amphiphilic block copolymers (ABCPs) and cadmium telluride nanocrystals (CdTe NCs) were used as the active layer to fabricate the HSCs via aqueous processing. The ABCPs composed of poly(3-hexylthiophene) (P3HT) and poly(acrylic acid) (PAA) self-assembled into ordered nanostructured micelles which then transformed to nanowires by comicellization with P3HT additives...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28485819/an-open-circuit-voltage-and-power-conversion-efficiency-study-of-fullerene-ternary-organic-solar-cells-based-on-oligomer-oligomer-and-oligomer-polymer
#16
Guichuan Zhang, Cheng Zhou, Chen Sun, Xiaoe Jia, Baomin Xu, Lei Ying, Fei Huang, Yong Cao
Variations in the open-circuit voltage (Voc ) of ternary organic solar cells are systematically investigated. The initial study of these devices consists of two electron-donating oligomers, S2 (two units) and S7 (seven units), and the electron-accepting [6,6]-phenyl C71 butyric acid methyl ester (PC71 BM) and reveals that the Voc is continuously tunable due to the changing energy of the charge transfer state (Ect ) of the active layers. Further investigation suggests that Voc is also continuously tunable upon change in Ect in a ternary blend system that consists of S2 and its corresponding polymer (P11):PC71 BM...
May 9, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28481109/reduction-of-charge-carrier-recombination-at-zno-polymer-blend-interfaces-in-ptb7-based-bulk-heterojunction-solar-cells-using-regular-device-structure-impact-of-zno-nanoparticle-size-and-surfactant
#17
Sadok Ben Dkhil, Meriem Gaceur, Abdou Karim Diallo, Yahia Didane, Xianjie Liu, Mats Fahlman, Olivier Margeat, Jörg Ackermann, Christine Videlot-Ackermann
Cathode interfacial layers, also called electron extraction layers (EELs), based on zinc oxide (ZnO) have been studied in polymer-blend solar cells toward optimization of the opto-electric properties. Bulk heterojunction solar cells based on poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl}) (PTB7) and [6,6]-phenyl-C71-butyric acid methyl ester (PC70BM) were realized in regular structure with all-solution-processed interlayers...
May 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28481063/high-photon-to-current-conversion-in-solar-cells-based-on-light-absorbing-silver-bismuth-iodide-with-space-group-r%C3%A2-3m-crystal-structure
#18
Huimin Zhu, Mingao Pan, Malin B Johansson, Erik Johansson
In this report a lead-free silver-bismuth-iodide (AgI:BiI3) with a crystal structure with space group R3m is investigated for use in solar cells. Devices based on the silver-bismuth-iodide deposited from solution on top of TiO2, and the conducting polymer P3HT as a hole transport layer, are prepared and the photovoltaic performance is very promising with a power conversion efficiency over 2 %, which is higher than the performance of previously reported bismuth-halide materials for solar cells. Photocurrent generation is observed between 350 and 700 nm, and the maximum external quantum efficiency is around 45 %...
May 8, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28481002/non-conjugated-polymer-as-an-efficient-dopant-free-hole-transporting-material-for-perovskite-solar-cells
#19
Yachao Xu, Tongle Bu, Meijin Li, Tianshi Qin, Chengrong Yin, Nana Wang, Renzhi Li, Jie Zhong, Fuzhi Huang, Hai Li, Yong Peng, Jianpu Wang, Linghai Xie, Wei Huang
A novel non-conjugated polymer (PVCz-OMeDAD) with good solution processability was developed to serve as an efficient dopant-free hole transporting material (HTM) for perovskite solar cells (PSCs). PVCz-OMeDAD was simply prepared by the free-radical polymerization of vinyl monomer which was synthesized from low cost raw materials via three high-yield synthesis steps. The combination of flexible non-conjugated polyvinyl main chain and hole-transporting methoxydiphenylamine-substituted carbazole side chain endowed PVCz-OMeDAD with excellent film-forming ability, suitable energy level, high hole mobility and low interfacial charge recombination...
May 8, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28471461/corrigendum-functional-solid-additive-modified-pedot-pss-as-an-anode-buffer-layer-for-enhanced-photovoltaic-performance-and-stability-in-polymer-solar-cells
#20
Binrui Xu, Sai-Anand Gopalan, Anantha-Iyengar Gopalan, Nallal Muthuchamy, Kwang-Pill Lee, Jae-Sung Lee, Yu Jiang, Sang-Won Lee, Sae-Wan Kim, Ju-Seong Kim, Hyun-Min Jeong, Jin-Beom Kwon, Jin-Hyuk Bae, Shin-Won Kang
No abstract text is available yet for this article.
May 4, 2017: Scientific Reports
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