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Solar cells

Zhenghui Luo, Haijun Bin, Tao Liu, Zhi-Guo Zhang, Yankang Yang, Cheng Zhong, Beibei Qiu, Guanghao Li, Wei Gao, Dongjun Xie, Kailong Wu, Yanming Sun, Feng Liu, Yongfang Li, Chuluo Yang
A novel small molecule acceptor MeIC with a methylated end-capping group is developed. Compared to unmethylated counterparts (ITCPTC), MeIC exhibits a higher lowest unoccupied molecular orbital (LUMO) level value, tighter molecular packing, better crystallites quality, and stronger absorption in the range of 520-740 nm. The MeIC-based polymer solar cells (PSCs) with J71 as donor, achieve high power conversion efficiency (PCE), up to 12.54% with a short-circuit current (JSC ) of 18.41 mA cm-2 , significantly higher than that of the device based on J71:ITCPTC (11...
January 15, 2018: Advanced Materials
Jijian Xu, Dong Wang, Heliang Yao, Kejun Bu, Jie Pan, Jianqiao He, Fangfang Xu, Zhanglian Hong, Xiaobo Chen, Fuqiang Huang
Nano TiO2 is investigated intensely due to extraordinary photoelectric performances in photocatalysis, new-type solar cells, etc., but only very few synthesis and physical properties have been reported on nanostructured TiO or other low valent titanium-containing oxides. Here, a core-shell nanoparticle made of TiO core covered with a ≈5 nm shell of amorphous TiO1+x is newly constructed via a controllable reduction method to synthesize nano TiO core and subsequent soft oxidation to form the shell (TiO1+x )...
January 15, 2018: Advanced Materials
Tengfei Li, Shuixing Dai, Zhifan Ke, Langxuan Yang, Jiayu Wang, Cenqi Yan, Wei Ma, Xiaowei Zhan
A fused tris(thienothiophene) (3TT) building block is designed and synthesized with strong electron-donating and molecular packing properties, where three thienothiophene units are condensed with two cyclopentadienyl rings. Based on 3TT, a fused octacylic electron acceptor (FOIC) is designed and synthesized, using strong electron-withdrawing 2-(5/6-fluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)-malononitrile as end groups. FOIC exhibits absorption in 600-950 nm region peaked at 836 nm with extinction coefficient of up to 2 × 105 m-1 cm-1 , low bandgap of 1...
January 15, 2018: Advanced Materials
Qingsen Zeng, Xiaoyu Zhang, Xiaolei Feng, Siyu Lu, Zhaolai Chen, Xue Yong, Simon A T Redfern, Haotong Wei, Haiyu Wang, Huaizhong Shen, Wei Zhang, Weitao Zheng, Hao Zhang, John S Tse, Bai Yang
Cesium-based trihalide perovskites have been demonstrated as promising light absorbers for photovoltaic applications due to their superb composition stability. However, the large energy losses (Eloss ) observed in inorganic perovskite solar cells has become a major hindrance impairing the ultimate efficiency. Here, an effective and reproducible method of modifying the interface between a CsPbI2 Br absorber and polythiophene hole-acceptor to minimize the Eloss is reported. It is demonstrated that polythiophene, deposited on the top of CsPbI2 Br, can significantly reduce electron-hole recombination within the perovskite, which is due to the electronic passivation of surface defect states...
January 15, 2018: Advanced Materials
Wenchao Huang, Pei Cheng, Yang Michael Yang, Gang Li, Yang Yang
Organic solar cells (OSCs) based on bulk heterojunction structures are promising candidates for next-generation solar cells. However, the narrow absorption bandwidth of organic semiconductors is a critical issue resulting in insufficient usage of the energy from the solar spectrum, and as a result, it hinders performance. Devices based on multiple-donor or multiple-acceptor components with complementary absorption spectra provide a solution to address this issue. OSCs based on multiple-donor or multiple-acceptor systems have achieved power conversion efficiencies over 12%...
January 15, 2018: Advanced Materials
Emily R Draper, Bart Dietrich, Christopher Brasnett, Stephen Sproules, Tom O McDonald, Annela M Seddon, Dave J Adams
As the use of low-molecular-weight gelators (LMWGs) as components in single and multicomponent systems for optoelectronic and solar cell applications increases, so does the need for more functional gelators. There are relatively few examples of p-type gelators that can be used in such systems. Here, the synthesis and characterization of three amino-acid-functionalized p-type gelators based on terthiophene, tetrathiafulvalene, and oligo(phenylenevinylene) are described. The cores of these molecules are already used as electron donors in optoelectronic applications...
January 15, 2018: Macromolecular Rapid Communications
Fatih Ongul, Sureyya Aydin Yuksel, Cagdas Allahverdi, Sinem Bozar, Mehmet Kazici, Serap Gunes
In this study, the high quality CdSe nanocrystals (NCs) capped with stearic acid were synthesized in a solvent and then purified four times by using the precipitation and redissolution process. The average size of the synthesized CdSe NCs was determined ~3.0nm via transmission electron microscopy (TEM) measurement and their corresponding optical band edge energy was also calculated as ~2.1eV using ultraviolet-visible (UV-Vis) absorption spectroscopy. The bulk heterojunction (BHJ) hybrid solar cells based on a ternary system including P3HT, PCBM and CdSe NCs at different weight concentrations (0wt%, 0...
January 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Lan Yang, Ke Wei, Zhongjie Xu, Feiming Li, Runze Chen, Xin Zheng, Xiangai Cheng, Tian Jiang
Recent progress in solar cell and light-emitting devices makes halide perovskite a research hot spot in optics. In this Letter, the nonlinear absorption and fluorescence properties of FAPbBr3 nanocrystal, one typical organometallic halide perovskite, have been investigated via Z-scan measurements and a density-dependent photoluminescence (PL) spectrum. The FAPbBr3 nanocrystal exhibits nonlinear absorption under the excitation of 800 nm, whose photon energy is below the bandgap of FAPbBr3. The significant absorption is experimentally confirmed to be induced by two-photon absorption (TPA), and the TPA coefficient is measured to be ∼0...
January 1, 2018: Optics Letters
Amna Bashir, Sudhanshu Shukla, Jia Haur Lew, Shashwat Shukla, Annalisa Bruno, Disha Gupta, Tom Baikie, Rahul Patidar, Zareen Akhter, Anish Priyadarshi, Nripan Mathews, Subodh G Mhaisalkar
Carbon based perovskite solar cells (PSCs) are fabricated through easily scalable screen printing techniques, using abundant and cheap carbon to replace the hole transport material (HTM) and the gold electrode further reduces costs, and carbon acts as a moisture repellent that helps in maintaining the stability of the underlying perovskite active layer. An inorganic interlayer of spinel cobaltite oxides (Co3O4) can greatly enhance the carbon based PSC performance by suppressing charge recombination and extracting holes efficiently...
January 12, 2018: Nanoscale
Sadok Ben Dkhil, Martin Pfannmöller, Rasmus R Schroeder, Riva Alkarsifi, Meriem Gaceur, Wolfgang Köntges, Hamed Heidari, Sara Bals, Olivier Margeat, Jörg Ackermann, Christine Videlot-Ackermann
The thermal stability of printed polymer solar cells at elevated temperatures needs to be improved to achieve high-throughput fabrication including annealing steps as well as long-term stability. During device processing, thermal annealing impact both the organic photoactive layer and the two interfacial layers making detailed studies of degradation mechanism delicate. A recently identified thermally stable PTB7:PC70BM blend as photoactive layer in combination with PEDOT:PSS as hole extraction layer is used here to focus on the impact of electron extraction layer (EEL) on the thermal stability of solar cells...
January 12, 2018: ACS Applied Materials & Interfaces
Won-Gyu Choi, Dong-Won Kang, Sungjae Na, Chan-Gyu Park, Fatma Pinar Gokdemir, Taeho Moon
High-quality and reproducible perovskite layer fabrication routes are essential for the implementation of efficient planar solar cells. Here, we introduce a sequential vapor-processing route based on physical vacuum evaporation of a PbCl2 layer followed by chemical reaction with methyl-ammonium iodide vapor. The demonstrated vapor-grown perovskite layers show compact, pinhole-free, and uniform microstructure with the average grain size of ~ 320 nm. Planar heterojunction perovskite solar cells are fabricated using TiO2 and spiro-OMeTAD charge transporting layers in regular n-i-p form...
January 11, 2018: Nanoscale Research Letters
M Rezvani, M Darvish Ganji, S Jameh-Bozorghi, A Niazi
In the present work density functional theory (DFT) and time-dependent semiempirical ZNIDO/S (TD-ZNIDO/S) methods have been used to investigate the ground state geometries, electronic structures and excited state properties of triad systems. The influences of the type of metal in the porphyrin ring, change in bridge position and porphyrine-ZnP duplicate on the energies of frontier molecular orbital and UV-Vis spectra has been studied. Geometry optimization, the energy levels and electron density of the Highest Occupied Molecular Orbital (HOMO) and the Lowest Unoccupied Molecular Orbital (LUMO), chemical hardness (η), electrophilicity index (ω), electron accepting power (ω+) were calculated using ZINDO/S method to predict which molecule is the most efficient with a great capability to be used as a triad molecule in solar industry...
January 2, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Yameng Ren, Danyang Sun, Yiming祎明 Cao曹, Hoi Nok Tsao, Yi Yuan, Shaik M Zakeeruddin, Peng Wang, Michael Grätzel
We report a blue donor-acceptor organic dye, coded as R6, which features a primary chromophore of a polycyclic aromatic hydrocarbon 9,19-dihydrobenzo[1',10']phenanthro[3',4':4,5]thieno[3,2-b]benzo[1,10]phenanthro[3,4-d]thiophene (BPT2) coupled with a diarylamine electron-donor and 4-(7-ethynylbenzo[c][1,2,5]thiadiazol-4-yl)benzoic acid acceptor. Dye R6 displays a brilliant sapphire color on a sensitized titania mesoporous film together with a Co(II/III)tris(bipyridyl)-based redox electrolyte. Significantly, such judiciously tailored DSCs achieve an impressive solar-to-electric power conversion efficiency (PCE) of 12...
January 11, 2018: Journal of the American Chemical Society
Constantin Hetzer, Dirk Guldi, Rik R Tykwinski
Singlet fission (SF) involves the spontaneous splitting of a photoexcited singlet state into a pair of triplets, and it holds great promise toward the realization of more efficient solar cells. Although the process of SF has been known since the 1960s, debate regarding the underlying mechanism continues to this day, especially for molecular materials. A number of different chromophores have been synthesized and studied in order to better understand the process of SF. These previous reports have established that pentacene and its derivatives are especially well suited for the study of SF, since the energetic requirement E(S1) ≥ 2E(T1) is fulfilled rendering the process exothermic and unidirectional...
January 11, 2018: Chemistry: a European Journal
Kunpeng Li, Junyan Xiao, Xinxin Yu, Tianhui Li, Da Xiao, Jiang He, Peng Zhou, Yangwen Zhang, Wangnan Li, Zhiliang Ku, Jie Zhong, Fuzhi Huang, Yong Peng, Yibing Cheng
Large-area, pinhole-free CH3NH3PbI3 perovskite thin films were successfully fabricated on 5 cm × 5 cm flexible indium tin oxide coated polyethylene naphthalate (ITO-PEN) substrates through a sequential evaporation/spin-coating deposition method in this research. The influence of the rate-controlled evaporation of PbI2 films on the quality of the perovskite layer and the final performance of the planar-structured perovskite solar cells were investigated. An ultrafast evaporation rate of 20 Å s-1 was found to be most beneficial for the conversion of PbI2 to CH3NH3PbI3 perovskite...
January 11, 2018: Scientific Reports
Yan-Fei Li, Yu-Tong Li, Wei-Min Wang, Da-Wei Yuan, Bao-Jun Zhu, Jia-Yong Zhong, Hui-Gang Wei, Fang Li, Bo Han, Kai Zhang, Xiao-Xing Pei, Zhe Zhang, Jia-Rui Zhao, Chang Liu, Guo-Qian Liao, Zhi-Heng Fang, Chen Wang, Xiao-Gang Wang, Youichi Sakawa, Yong-Joo Rhee, Xin Lu, Neng Hua, Bao-Qiang Zhu, Taichi Morita, Yasuhiro Kuramitsu, Xiu-Guang Huang, Si-Zu Fu, Jian-Qiang Zhu, Gang Zhao, Jie Zhang
When comets interacting with solar wind, straight and narrow plasma tails will be often formed. The most remarkable phenomenon of the plasma tails is the disconnection event, in which a plasma tail is uprooted from the comet's head and moves away from the comet. In this paper, the interaction process between a comet and solar wind is simulated by using a laser-driven plasma cloud to hit a cylinder obstacle. A disconnected plasma tail is observed behind the obstacle by optical shadowgraphy and interferometry...
January 11, 2018: Scientific Reports
Xiaoyan Zhang, You Xu, Junjie Zhang, Shuai Dong, Liming Shen, Arunava Gupta, Ningzhong Bao
Two-dimensional (2D) semiconducting nanomaterials have generated much interest both because of fundamental scientific interest and technological applications arising from the unique properties in two dimensions. However, the colloidal synthesis of 2D quaternary chalcogenide nanomaterials remains a great challenge owing to the lack of intrinsic driving force for its anisotropic growth. 2D wurtzite Cu2ZnSnS4 nanosheets (CZTS-NS) with high-energy (002) facets have been obtained for the first time via a simple one-pot thermal decomposition method...
January 10, 2018: Scientific Reports
Dongdong Li, Wen-Yong Lai, Yi-Zhou Zhang, Wei Huang
Printed electronics are an important enabling technology for the development of low-cost, large-area, and flexible optoelectronic devices. Transparent conductive films (TCFs) made from solution-processable transparent conductive materials, such as metal nanoparticles/nanowires, carbon nanotubes, graphene, and conductive polymers, can simultaneously exhibit high mechanical flexibility, low cost, and better photoelectric properties compared to the commonly used sputtered indium-tin-oxide-based TCFs, and are thus receiving great attention...
January 10, 2018: Advanced Materials
Zhen Wang, Xiangwei Zhu, Jianqi Zhang, Kun Lu, Jin Fang, Yajie Zhang, Zaiyu Wang, Lingyun Zhu, Wei Ma, Zhigang Shuai, Zhixiang Wei
Ternary blending strategy has been used to design and fabricate efficient organic solar cells by enhancing the short-circuit current density and the fill factor. In this manuscript, we report an all small molecule ternary solar cells consisting two compatible small molecules DR3TBDTT (M1) and DR3TBDTT-E (M2) as donors and PC71BM as acceptor. A transformation from an alloy-like model to a cascade model are first realized by designing a novel molecule M2. It is observed that after thermal and solvent vapor annealing M2 shifts from the mixed region to donor-acceptor (D-A) interfaces which ameliorates the charge transfer and recombination processes...
January 10, 2018: Journal of the American Chemical Society
Siraj Sidhik, Andrea Cerdan-Pasaran, Diego Esparza, Tzarara Lopez-Luke, Ramon Carriles, Elder De La Rosa
We for the first time report the incorporation of cobalt into a mesoporous TiO2 electrode for application in perovskite solar cells (PSCs).The Co-doped PSC exhibits excellent optoelectronic properties; we explain the improvements by passivation of electronic trap or sub-band gap states arising due to the oxygen vacancies in pristine-TiO2, enabling faster electron transport and collection. A simple post-annealing treatment is used to prepare the cobalt-doped mesoporous electrode; UV-vis, XPS, SCLC, photoluminescence and electrochemical impedance measurements confirm the incorporation of cobalt, enhanced conductivity and the passivation effect induced in the TiO2...
January 10, 2018: ACS Applied Materials & Interfaces
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