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organic photovoltaic

Pei Cheng, Jiayu Wang, Qianqian Zhang, Wenchao Huang, Jingshuai Zhu, Rui Wang, Sheng-Yung Chang, Pengyu Sun, Lei Meng, Hongxiang Zhao, Hao-Wen Cheng, Tianyi Huang, Yuqiang Liu, Chaochen Wang, Chenhui Zhu, Wei You, Xiaowei Zhan, Yang Yang
Incorporating narrow-bandgap near-infrared absorbers as the third component in a donor/acceptor binary blend is a new strategy to improve the power conversion efficiency (PCE) of organic photovoltaics (OPV). However, there are two main restrictions: potential charge recombination in the narrow-gap material and miscompatibility between each component. The optimized design is to employ a third component (structurally similar to the donor or acceptor) with a lowest unoccupied molecular orbital (LUMO) energy level similar to the acceptor and a highest occupied molecular orbital (HOMO) energy level similar to the donor...
May 21, 2018: Advanced Materials
Ke Wang, Haifeng Ling, Yan Bao, Mengting Yang, Yi Yang, Mubashir Hussain, Huayang Wang, Lianbin Zhang, Linghai Xie, Mingdong Yi, Wei Huang, Xiaolin Xie, Jintao Zhu
Due to the near-field coupling effect, non-close-packed nanoparticle (NP) assemblies with tunable interparticle distance (d) attract great attention and show huge potential applications in various functional devices, e.g., organic nano-floating-gate memory (NFGM) devices. Unfortunately, the fabrication of device-scale non-close-packed 2D NPs material still remains a challenge, limiting its practical applications. Here, a facile yet robust "rapid liquid-liquid interface assembly" strategy is reported to generate a non-close-packed AuNP superlattice monolayer (SM) on a centimeter scale for high-performance pentacene-based NFGM...
May 21, 2018: Advanced Materials
Lei Zhang, Nadiia Pasthukova, Yifan Yao, Xiaolan Zhong, Egon Pavlica, Gvido Bratina, Emanuele Orgiu, Paolo Samorì
Self-standing nanostructures are of fundamental interest in materials science and nanoscience and are widely used in (opto-)electronic and photonic devices as well as in micro-electromechanical systems. To date, large-area and self-standing nanoelectrode arrays assembled on flexible substrates have not been reported. Here the fabrication of a hollow nanomesh scaffold on glass and plastic substrates with a large surface area over 1 mm2 and ultralow leakage current density (≈1-10 pA mm-2 @ 2 V) across the empty scaffold is demonstrated...
May 21, 2018: Advanced Materials
Hayato Ouchi, Takahiro Kizaki, Masaki Yamato, Xu Lin, Nagahiro Hoshi, Fabien Silly, Takashi Kajitani, Takanori Fukushima, Ken-Ichi Nakayama, Shiki Yagai
Helical self-assembly of functional π-conjugated molecules offers unique photochemical and electronic properties in the spectroscopic level, but there are only a few examples that demonstrate their positive impact on the optoelectronic device level. Here, we demonstrate that hydrogen-bonded tapelike supramolecular polymers of a barbiturated oligo(alkylthiophene) show notable improvement in their photovoltaic properties upon organizing into helical nanofibers. A tapelike hydrogen-bonded supramolecular array of barbiturated oligo(butylthiophene) molecules was directly visualized by STM at a liquid-solid interface...
April 21, 2018: Chemical Science
Xiao Tan, Zhi Tao, Mingxing Yu, Hanxiao Wu, Haiwang Li
Black silicon fabrication and manipulation have been well reported by institutes around the world and are quite useful for solar absorption and photovoltaic conversion. In this study, silicon micro-nano hybrid structures were fabricated, and the morphologies of the hybrid structures were analyzed. This paper studied nanostructures formed on tips, pits and a flat surface using a dry etching method and a wet etching method. In terms of nanostructure morphology, nanostructures etched by the wet etching method (13 μm) were taller than those etched by the dry etching method (1 μm), but the wet etched morphology was less organized...
May 18, 2018: Scientific Reports
Tao Liu, Lijun Huo, Sreelakshmi Chandrabose, Kai Chen, Guangchao Han, Feng Qi, Xiangyi Meng, Dongjun Xie, Wei Ma, Yuanping Yi, Justin M Hodgkiss, Feng Liu, Jing Wang, Chuluo Yang, Yanming Sun
A polymer fibril assembly can dictate the morphology framework, in forming a network structure, which is highly advantageous in bulk heterojunction (BHJ) organic solar cells (OSCs). A fundamental understanding of how to manipulate such a fibril assembly and its influence on the BHJ morphology and device performance is crucially important. Here, a series of donor-acceptor polymers, PBT1-O, PBT1-S, and PBT1-C, is used to systematically investigate the relationship between molecular structure, morphology, and photovoltaic performance...
May 18, 2018: Advanced Materials
Le Zhang, Wei Geng, Chuan-Jia Tong, Xueguang Chen, Tengfei Cao, Mingyang Chen
Methyl-ammonium lead iodide perovskite (CH3 NH3 PbI3 ) has drawn great attention due to its excellent photovoltaic properties. Because of its loosely compacted structure, the structural, electronic and optical properties of CH3 NH3 PbI3 are sensitive to external modulations. Strain effects on CH3 NH3 PbI3 are fully investigated by the first principles calculations. The results indicate that the inorganic framework deforms under compression or stretch and the embedded organic CH3 NH3 + molecules rotate correspondingly...
May 17, 2018: Scientific Reports
Lijuan Li, Hui Lin, Xiao Kong, Xiaoyang Du, Xinwei Chen, Ling Zhou, Silu Tao, Caijun Zheng, Xiaohong Zhang
Ternary blend systems have been used to enhance the short-circuit current density (JSC) and fill factor (FF) of organic solar cells (OSCs). However, it is still a challenge to find suitable third components that concurrently possess complementary light absorption and well-matched energy levels. Here, a small organic molecule, 4,4'-(9,9-dihexyl-9H-fluorene-2,7-diyl)bis(N,N-bis(4-(pyren-1-yl)phenyl)anili-ne) (DFNPy), which contains a triphenylamine core and bulky pyrene rings, was designed and used to construct ternary blend OSCs...
May 17, 2018: Nanoscale
Anna Rozycka, Agnieszka Iwan, Krzysztof Artur Bogdanowicz, Michal Filapek, Natalia Górska, Agnieszka Hreniak, Monika Marzec
Three (4,4'-((1E,1'E)-(2,5-bis(octyloxy)-1,4-phenylene)bis(ethene-2,1-diyl))bis-(E)-N-(2,5-bis(octyloxy)benzylidene)) imine derivatives were synthesized via a condensation reaction with p-toluenesulfonic acid as a catalyst. The effects of the end groups and vinylene (-HC[double bond, length as m-dash]CH-) moieties on the structural, thermal, optical, electrochemical and photovoltaic properties of imines were investigated to check the influence of TiO2 on the imine properties. The thermal behavior of imines and their complexes with TiO2 was widely investigated using FT-IR, XRD, DSC and POM methods in order to determine the order type in the imine structure...
May 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Leonard Bezinge, Richard M Maceiczyk, Ioannis Lignos, Maksym V Kovalenko, Andrew J deMello
Recent advances in the development of hybrid organic-inorganic lead halide perovskite (LHP) nanocrystals (NCs) have demonstrated their versatility and potential application as photovoltaics and light emitters through compositional tuning of optical properties. That said, due to their compositional complexity, the targeted synthesis of mixed-cation, mixed-halide LHP NCs still represents an immense challenge for traditional batch scale chemistry. To address this limitation, we herein report the integration of a high-throughput segmented-flow microfluidic reactor and self-optimizing algorithm for the synthesis of nanocrystals with defined emission properties...
May 16, 2018: ACS Applied Materials & Interfaces
Wei Song, Xi Fan, Bingang Xu, Feng Yan, Huiqin Cui, Qiang Wei, Ruixiang Peng, Ling Hong, Jiaming Huang, Ziyi Ge
All-solution-processing at low temperatures is important and desirable for making printed photovoltaic devices and also offers the possibility of a safe and cost-effective fabrication environment for the devices. Herein, an all-solution-processed flexible organic solar cell (OSC) using poly(3,4-ethylenedioxythiophene):poly-(styrenesulfonate) electrodes is reported. The all-solution-processed flexible devices yield the highest power conversion efficiency of 10.12% with high fill factor of over 70%, which is the highest value for metal-oxide-free flexible OSCs reported so far...
May 16, 2018: Advanced Materials
Wenrui Liu, Jianyun Zhang, Zichun Zhou, Dongyang Zhang, Yuan Zhang, Shengjie Xu, Xiaozhang Zhu
Fused-ring electron acceptors (FREAs) have recently received intensive attention. Besides the continuing development of new FREAs, the demand for FREAs featuring good compatibility to donor materials is becoming more and more urgent, which is highly desirable for screening donor materials and achieving new breakthroughs. In this work, a new FREA is developed, ZITI, featuring an octacyclic dithienocyclopentaindenoindene central core. The core is designed by linking 2,7-dithienyl substituents and indenoindene with small methylene groups, in which the indeno[1,2-b]thiophene-2-(3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile part provides a large and unoccupied π-surface...
May 16, 2018: Advanced Materials
Ailing Tang, Fan Chen, Bo Xiao, Jing Yang, Jianfeng Li, Xiaochen Wang, Erjun Zhou
Devolopment of organic solar cells with high open-circuit voltage ( V OC ) and power conversion efficiency (PCE) simutaniously plays a significant role, but there is no guideline how to choose the suitable photovoltaic material combinations. In our previous work, we developed "the Same-Acceptor-Strategy" (SAS), by utilizing the same electron-accepting segment to construct both polymeric donor and small molecular acceptor. In this study, we further expend SAS to use both the same electron-accepting and electron-donating units to design the material combination...
2018: Frontiers in Chemistry
Xiaopeng Wang, Xingyu Liu, Cameron Cook, Bohdan Schatschneider, Noa Marom
Singlet fission (SF), the spontaneous down-conversion of a singlet exciton into two triplet excitons residing on neighboring molecules, is a promising route to improve organic photovoltaic (OPV) device efficiencies by harvesting two charge carriers from one photon. However, only a few materials have been discovered that exhibit intermolecular SF in the solid state, most of which are acene derivatives. Recently, there has been a growing interest in rylenes as potential SF materials. We use many-body perturbation theory in the GW approximation and the Bethe-Salpeter equation to investigate the possibility of intermolecular SF in crystalline perylene and quaterrylene...
May 14, 2018: Journal of Chemical Physics
Soeun Im, Wanjung Kim, Wonseok Cho, Dongguen Shin, Do Hyung Chun, Ryan Rhee, Jung Kyu Kim, Yeonjin Yi, Jong Hyeok Park, Jung Hyun Kim
Even though poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been commonly used as a hole extraction layer (HEL) for p-i-n perovskite solar cells (PSCs), the cells' photovoltaic performance deteriorates because of the low and unstable work functions (WFs) of PEDOT:PSS versus those of a perovskite layer. To overcome this drawback, we synthesized a copolymer (P(SS-co-TFPMA)) ionomer consisting of PSS and tetrafluoropropylmethacrylate (TFPMA) as an alternative to conventional PEDOT:PSS. The PEDOT:P(SS-co-TFPMA) copolymer solution and its film exhibited excellent homogeneity and high phase stability compared with a physical mixture of TFPMA with PEDOT:PSS solution...
May 15, 2018: ACS Applied Materials & Interfaces
Yang Yang, Jiacheng Wang, Han Xu, Xiaowei Zhan, Xingguo Chen
In this work, a kind of "D-A (Donor-Acceptor) combined pi-bridge" based on the regioselective reactivity of monofluoro-substituted benzothiadiazole (FBT) to link a thiophene ring has been designed to construct a new A-pi-D-pi-A type small molecular acceptor (IDT-FBTR) with indacenodithienothiophene (IDT) as a central core (D) and 3-octyl-2-(1,1-dicyanomethylene)rhodanine as an electron-withdrawing terminal group (A). Due to the strong intramolecular push-pull electron effect, IDT-FBTR shows a strong and broad intramolecular charge transfer (ICT) absorption band in the range of 500-750 nm...
May 15, 2018: ACS Applied Materials & Interfaces
Minghua Li, Xiaoqin Yan, Zhuo Kang, Yahuan Huan, Yong Li, Ruxiao Zhang, Yue Zhang
The major restraint for the commercialization of the high-performance hybrid metal halide perovskite solar cells is the long-term stability, especially at the infirm interface between the perovskite film and organic charge transfer layer. Recently, engineering the interface between the perovskite and spiro-OMeTAD becomes an effective strategy to simultaneously improve the efficiency and stability in the perovskite solar cells. In this work, we demonstrated that introducing an interfacial polystyrene layer between the perovskite film and spiro-OMeTAD layer can effectively improve the perovskite solar cells photovoltaic performance...
May 11, 2018: ACS Applied Materials & Interfaces
Xin Zhang, Caichi Liu, Gang Ren, Shiyun Li, Chenghao Bi, Qiuyan Hao, Hui Liu
Hybrid organic-inorganic perovskite materials have attracted extensive attention due to their impressive performance in photovoltaic devices. One-dimensional perovskite CH₃NH₃PbI₃ nanomaterials, possessing unique structural features such as large surface-to-volume ratio, anisotropic geometry and quantum confinement, may have excellent optoelectronic properties, which could be utilized to fabricate high-performance photodetectors. However, in comparison to CH₃NH₃PbI₃ thin films, reports on the fabrication of CH₃NH₃PbI₃ nanowires for optoelectrical application are rather limited...
May 10, 2018: Nanomaterials
Yifan Yao, Lei Zhang, Tim Leydecker, Paolo Samorì
Organic crystals are generated via the bottom-up self-assembly of molecular building blocks which are held together through weak non-covalent interactions. Although they revealed extraordinary charge transport characteristics, their labile nature represents a major drawback towards their integration in opto-electronic devices when the use sophisticated patterning techniques is required. Here we have devised a radically new method to enable the use of photolithography directly on molecular crystals, with a spatial resolution below 300 nm, thereby allowing the precise wiring-up of multiple crystals on demand...
May 10, 2018: Journal of the American Chemical Society
Fritz Nübling, Dan Yang, Peter Muller-Buschbaum, Martin Brinkmann, Michael Sommer
A detailed investigation of in-situ synthesized all-conjugated block copolymer (BCP) compatibilized ternary blends containing poly(3-hexylthiophene) (P3HT) and poly{[N,N'-bis(2-octyldodecyl)naphthalene-1,4,5,8-bis(dibcarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)} (PNDIT2) as donor and acceptor polymers, respectively, is presented. Both polymers are incompatible and show strong segregation in blends, which renders compatibilization with their corresponding BCPs promising to enable nanometer-phase separated structures suitable for excitonic devices...
May 10, 2018: ACS Applied Materials & Interfaces
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