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polymer solar cell

Kwang Hyun Park, Yujin An, Seungon Jung, Hyesung Park, Changduk Yang
Operational stability and high performance are the most critical issues that must be addressed in order to propel and advance the current polymer solar cell (PSC) technology to the next level such as manufacturing and mass production. Herein, we report a high power conversion efficiency (PCE) of 11.2% together with an excellent device stability in PTB7-Th:PC71BM-based PSCs in the inverted structure by introducing the n-type P(NDI2OD-T2) macromolecular additive (>75% PCE retention at high temperature up to 120 °C, >97% PCE retention after 6 months in inert conditions, >93% PCE retention after 2 months in air with encapsulation, and >80% PCE retention after 140 h in air without encapsulation)...
June 22, 2017: ACS Nano
Zhendong Li, Yanfeng Liu, Kai-Cheng Zhang, Zhao-Wei Wang, Peng Huang, Dahua Li, Yi Zhou, Bo Song
In order to provide orthogonal solvent processible surface modification and improve device stability of bulk-heterojunction polymer solar cells (PSCs), n-type semiconducting material naphthalene diimide (NDI) was chemically introduced on ITO surface as cathode interlayer (CIL) using 3-bromopropyltrimethoxysilane (BrTMS) as coupling agent. After modification, the work function of ITO can be decreased from 4.70 eV to 4.23 eV. The modified ITO cathode was applied in inverted PSCs based on PTB7-Th:PC71BM. With the CIL modification, a champion power conversion efficiency (PCE) of 5...
June 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Xue Gong, Guangwu Li, Yang Wu, Jicheng Zhang, Shiyu Feng, Yahui Liu, Cuihong Li, Wei Ma, Zhishan Bo
Three-component conjugated polymers P1-1 and P1-2 were prepared by one-pot Stille cross-coupling reaction and applied for polymer solar cell (PSCs). The two-component polymer P1-0 only comprises 5-flouro-6-alkyloxybenzothiadiazole (AFBT) acceptor unit and thiophene donor unit; while the three-component polymers P1-1 and P1-2 contain 10% and 20% 5,6-difluorobenzothiadiazole (DFBT), respectively, as the third component. The incorporation of the third component, 5,6-difluorobenzothiadiazole, makes the side chains discretely distributed in the polymer backbones, which can enhance the π-π stacking of polymers in film, markedly increase the hole mobility of active layers, and improve the power conversion efficiency (PCE) of devices...
June 20, 2017: ACS Applied Materials & Interfaces
Sheng Dong, Zhicheng Hu, Kai Zhang, Qingwu Yin, Xiaofang Jiang, Fei Huang, Yong Cao
A cross-linkable dual functional polymer hybrid electron transport layer (ETL) is developed by simply adding an amino-functionalized polymer dopant (PN4N) and a light crosslinker into a commercialized n-type semiconductor (N2200) matrix. It is found that the resulting hybrid ETL not only has a good solvent resistance, facilitating multilayers device fabrication but also exhibits much improved electron transporting/extraction properties due to the doping between PN4N and N2200. As a result, by using PTB7-Th:PC71 BM blend as an active layer, the inverted device based on the hybrid ETL can yield a prominent power conversion efficiency of around 10...
June 20, 2017: Advanced Materials
In-Bok Kim, Soo-Young Jang, Yeong-A Kim, Rira Kang, In-Sik Kim, Do-Kyeong Ko, Dong-Yu Kim
Fluorine (F) substitution on conjugated polymers in polymer solar cells (PSCs) has a diverse effect on molecular properties and device performance. We present a series of three D-A type conjugated polymers (PBT, PFBT and PDFBT) based on dithienothiophene and benzothiadiazole units with different numbers of F atoms to explain the influence of F substitution by comparing the molecular interac-tions of the polymers and the recombination kinetics in PSCs. The pre-aggregation behavior of PFBT and PDFBT in o-DCB at the UV-Vis absorption spectra proves that both polymers have strong intermolecular interactions...
June 19, 2017: ACS Applied Materials & Interfaces
Ilario Gelmetti, Lydia Cabau, Núria F Montcada, Emilio Palomares
We have fabricated MAPI solar cells using as selective contacts PEDOT:PSS polymer for holes and PCBM-C70 fullerene derivative for electrons. The thickness of MAPI, PCBM-C70, and PEDOT:PSS layers has been varied in order to evaluate the contribution of each layer to the final device performance. We have measured the devices capacitance under illumination and the charge carrier's lifetime using photoinduced time-resolved techniques. The results show that in this kind of devices the limiting layer is the PCBM-C70 due to its relative reduced mobility compared to PEDOT:PSS that makes the control of the fullerene thickness crucial for device optimization...
June 21, 2017: ACS Applied Materials & Interfaces
Wei Wang, Cenqi Yan, Tsz-Ki Lau, Jiayu Wang, Kuan Liu, Yan Fan, Xinhui Lu, Xiaowei Zhan
A fused hexacyclic electron acceptor, IHIC, based on strong electron-donating group dithienocyclopentathieno[3,2-b]thiophene flanked by strong electron-withdrawing group 1,1-dicyanomethylene-3-indanone, is designed, synthesized, and applied in semitransparent organic solar cells (ST-OSCs). IHIC exhibits strong near-infrared absorption with extinction coefficients of up to 1.6 × 10(5) m(-1) cm(-1) , a narrow optical bandgap of 1.38 eV, and a high electron mobility of 2.4 × 10(-3) cm(2) V(-1) s(-1) . The ST-OSCs based on blends of a narrow-bandgap polymer donor PTB7-Th and narrow-bandgap IHIC acceptor exhibit a champion power conversion efficiency of 9...
June 13, 2017: Advanced Materials
Moustafa El Kass, Brohan Luc, Nicolas Gautier, Solène Béchu, Céline David, Noëlla Lemaitre, Solenn Berson, M Richard-Plouet
Using reflux method with [Ti8O12(H2O)24]Cl8.HCl.7H2O as titanium precursor at 120°C for 24h leads to produce a transparent colloidal solution of nanosized crystallised anatase TiO2. The adjustment of the particle size and composition of the dispersant is monitored through the initial water content while controlling the conversion of propylene carbonate into propylene glycol occuring during reflux. The solutions were processed as thin films in order to produce electron transporting layers in hybrid bulk heterojunction solar cells, using a blend of P3HT-PCBM polymers as absorbers, in inverted architecture...
June 12, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Sang Jin Lee, Yekyung Kim, Jun-Yeon Hwang, Ju-Ho Lee, Seungon Jung, Hyesung Park, Seungmin Cho, Sahn Nahm, Woo Seok Yang, Hyeongkeun Kim, Seung Ho Han
Flexible and crystallized indium-tin oxide (ITO) thin films were successfully obtained on plastic polyethylene terephthalate (PET) films with monolayered graphene as a platform. The highly crystalline ITO (c-ITO) was first fabricated on a rigid substrate of graphene on copper foil and it was subsequently transferred onto a PET substrate by a well-established technique. Despite the plasma damage during ITO deposition, the graphene layer effectively acted as a Cu-diffusion barrier. The c-ITO/graphene/PET electrode with the 60-nm-thick ITO exhibited a reasonable sheet resistance of ~45 Ω sq(-1) and a transmittance of ~92% at a wavelength of 550 nm...
June 9, 2017: Scientific Reports
Ruiyuan Liu, Jie Wang, Teng Sun, Mingjun Wang, Changsheng Wu, Haiyang Zou, Tao Song, Xiaohong Zhang, Shuit-Tong Lee, Zhong Lin Wang, Baoquan Sun
An integrated self-charging power unit, combining a hybrid silicon nanowire/polymer heterojunction solar cell with a polypyrrole-based supercapacitor, has been demonstrated to simultaneously harvest solar energy and store it. By efficiency enhancement of the hybrid nanowire solar cells and a dual-functional titanium film serving as conjunct electrode of the solar cell and supercapacitor, the integrated system is able to yield a total photoelectric conversion to storage efficiency of 10.5%, which is the record value in all the integrated solar energy conversion and storage system...
June 9, 2017: Nano Letters
Marinos Tountas, Yasemin Topal, Ermioni Polydorou, Anastasia Soultati, Apostolis Verykios, Andreas Kaltzoglou, Theodoros A Papadopoulos, Florian Auras, Kostas Seintis, Mihalis Fakis, Leonidas C Palilis, Dimitris Tsikritzis, Stella Kennou, Matroni Koutsoureli, George Papaioannou, Mustafa Ersoz, Mahmut Kus, Polycarpos Falaras, Dimitris Davazoglou, Panagiotis Argitis, Maria Vasilopoulou
Effective interface engineering has been shown to play a vital role in facilitating efficient charge carrier transport thus boosting the performance of organic photovoltaic devices. Herein we employ water soluble lacunary polyoxometalates (POMs) as multifunctional interlayers between the titanium oxide (TiO2) electron extraction/transport layer and the organic photoactive film to simultaneously enhance the efficiency, lifetime and photostability of polymer solar cells. A significant reduction in work function (WF) of TiO2 upon POM deposition was observed, with the magnitude being controlled by the negative charge of the anion and the selection of the addenda atom (W or Mo)...
June 6, 2017: ACS Applied Materials & Interfaces
Vediappan Sudhakar, Arulraj Arulkashmir, Kothandam Krishnamoorthy
Dye regeneration was improved by using an optimum quantity of graphene, which was dispersed in a polymer that suppresses back electron transfer. Using this approach, DSSCs with an efficiency of 10.4% have been fabricated.
June 16, 2017: Chemical Communications: Chem Comm
Jun Liu, Ruyan Zhao, Yang Min, Chuandong Dou, Lixiang Wang
In this manuscript, we report 4,4-difluoro-4H-cyclopenta[2,1-b:3,4-b']dithiophene (fCDT) as a new electron-rich unit to design polymer electron acceptors. Owing to the fluoro substitutes, fCDT unit exhibits downshifted LUMO energy level, diminished steric hindrance effect and strong intermolecular interaction. The resulting polymer electron acceptor exhibits low-lying LUMO energy level and high electron mobility, as well as good all-polymer solar cell device performance.
May 31, 2017: Chemistry: a European Journal
Shujun Li, Zhiqi Li, Chunyu Liu, Xinyuan Zhang, Zhihui Zhang, Wenbin Guo, Liang Shen, Shengping Ruan, Liu Zhang
In this contribution, a series of conducting polyfluorenes (PF) are introduced to improve interface adhesion and boost charge extraction of the TiO2 electron transport layer of inverted polymer solar cells (PSCs). After employing poly (9,9-dihexylfluorenyl-2,7-diyl) (PDF), poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-co-(1,4-benzo-{2,1',3}-thiadiazole)] (PDFBT), and poly[(4-(5-(7-methyl-9,9-dioctyl-9H-fluoren-2-yl) thiophen-2-yl)-7-(5-methylthiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PFTBT) as capping layers, interfacial coherence improvement and energy loss decrease are both achieved, facilitating charge transfer from the active layer to the TiO2 layer...
June 14, 2017: Physical Chemistry Chemical Physics: PCCP
Shichao Zhou, Cheng Li, Jianqi Zhang, Yaping Yu, Andong Zhang, Yonggang Wu, Weiwei Li
Porphyrin-based molecules have been widely used in dye-sensitized solar cells and bulk-heterojunction solar cells, but their application in field-effect transistors (FETs) is limited. In this work, two conjugated polymers based on diketopyrrolopyrrole and porphyrin were developed for FETs. The polymers exhibit extra-low band gap with aligned energy levels close to -4.0 eV and -5.0 eV because of the strong electron-donating and withdrawing ability of aromatic units. With additionally high crystalline properties, ambipolar charge carrier transport with a hole mobility of 0...
May 30, 2017: Chemistry, An Asian Journal
Hyung Do Kim, Nayu Yanagawa, Ai Shimazaki, Masaru Endo, Atsushi Wakamiya, Hideo Ohkita, Hiroaki Benten, Shinzaburo Ito
Herein, the open-circuit voltage (VOC) loss in both polymer solar cells and perovskite solar cells is quantitatively analyzed by measuring the temperature dependence of VOC to discuss the difference in the primary loss mechanism of VOC between them. As a result, the photon energy loss for polymer solar cells is in the range of about 0.7-1.4 eV, which is ascribed to temperature-independent and -dependent loss mechanisms, while that for perovskite solar cells is as small as about 0.5 eV, which is ascribed to a temperature-dependent loss mechanism...
June 5, 2017: ACS Applied Materials & Interfaces
Can Wang, Zhiyang Liu, Mengshu Li, Yujun Xie, Bingshi Li, Shuo Wang, Shan Xue, Qian Peng, Bin Chen, Zujin Zhao, Qianqian Li, Ziyi Ge, Zhen Li
As a promising option out of all of the well-recognized candidates that have been developed to solve the coming energy crisis, polymer solar cells (PSCs) are a kind of competitive clean energy source. However, as a convenient and efficient method to improve the efficiency of PSCs, the inherent mechanism of the interfacial modification was still not so clear, and interfacial materials constructed with new units were limited to a large degree. Here we present a new kind of interfacial material consisting of AIE units for the first time, with an efficiency of 8...
May 1, 2017: Chemical Science
Christian M Wolff, Fengshuo Zu, Andreas Paulke, Lorena Perdigón Toro, Norbert Koch, Dieter Neher
Perovskite solar cells with all-organic transport layers exhibit efficiencies rivaling their counterparts that employ inorganic transport layers, while avoiding high-temperature processing. Herein, it is investigated how the choice of the fullerene derivative employed in the electron-transporting layer of inverted perovskite cells affects the open-circuit voltage (VOC ). It is shown that nonradiative recombination mediated by the electron-transporting layer is the limiting factor for the VOC in the cells. By inserting an ultrathin layer of an insulating polymer between the active CH3 NH3 PbI3 perovskite and the fullerene, an external radiative efficiency of up to 0...
May 26, 2017: Advanced Materials
Ruina Dai, Yangyang Wang, Jie Wang, Xianyu Deng
MoS2 as a graphene-like 2D material shows a large potential to replace even overcome graphene in various important applications due to its perfect properties of electrical, optical, frictional, and tunable band gap. However, low solubility in the most of common solvents makes it difficult to prepare via a simple solution process. Here we introduce a metalorganic compound to modify MoS2. Phenyl acetylene silver (PAS) functionalized MoS2 compound is easily dispersed in the solvent of DMF and water. A conductive polymer PEDOT: PSS blend with the MoS2 leads to a significant enhancement of the performance of planar heterojunction perovskite solar cells...
May 25, 2017: ChemSusChem
Hongjian Peng, Xiangfeng Luan, Liuliu Feng, Jun Yuan, Zhi-Guo Zhang, Yongfang Li, Yingping Zou
Ladder-type conjugated structures with rigid and coplanar molecular frameworks feature longer effective conjugation, affirmative optoelectronic properties and strong intermolecular π-π interactions, which are ideal characteristics for organic photovoltaics. Here, a new "zigzag" angular-fused naphthodifuran (zNDF) based on alkoxyphenyl side chains was designed and synthesized. The distannylated zNDF building block was copolymerized with 4,7-di(5-bromothiophen-2-yl)-5,6-dioctyloxybenzo[c][1,2,5]thiadiazole and 5,8-bis(5-bromothiophen-2-yl)-2,3-bis(4-(2-ethylhexyloxy)-3-fluorophenyl)-6,7-difloroquinoxaline (Br-BT and Br-ffQx) acceptor units by Stille cross coupling reaction to form two new medium bandgap donor-acceptor polymers PzNDFP-BT and PzNDFP-ffQx, respectively...
June 7, 2017: Physical Chemistry Chemical Physics: PCCP
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