| 1. |
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| 2. |
- Guo, Xuewen, et al.
(författare)
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Understanding the effect of N2200 on performance of J71 : ITIC bulk heterojunction in ternary non-fullerene solar cells
- 2019
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Ingår i: Organic electronics. - : Elsevier. - 1566-1199 .- 1878-5530. ; 71, s. 65-71
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Tidskriftsartikel (refereegranskat)abstract
- None-fullerene solar cells with ternary architecture have attracted much attention because it is an effective approach for boosting the device power conversion efficiency. Here, the crystalline polymer N2200 as the third component is integrated into J71: ITIC bulk heterojunction. A series of characterizations indicate that N2200 could increase photo-harvesting, balanced hole and electron mobilities, enhanced exciton dissociation, and suppressed charge recombination, which result in the comprehensive improvement of open circuit voltage, short circuit current and fill factor in the device. Moreover, after introduction of N2200, the morphology of the ternary active layer is optimized, and the film crystallinity is improved. This work demonstrates that adding a small quantity of high crystallization acceptor into non-fullerene donor: acceptor mixture is a promising strategy toward developing high-performance organic solar cells.
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| 3. |
- Li, Fei, et al.
(författare)
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Highly efficient oxidation of water by a molecular catalyst immobilized on carbon nanotubes
- 2011
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Ingår i: Angewandte Chemie International Edition. - : Wiley. - 1433-7851 .- 1521-3773. ; 50:51, s. 12276-12279
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Tidskriftsartikel (refereegranskat)abstract
- A successful team: A molecular device based on multiwalled carbon nanotubes functionalized by a mononuclear ruthenium catalyst has been shown to split water electrochemically (see picture; ITO=indium tin oxide). The readily prepared electrode showed excellent electrocatalytic activity for the oxidation of water, a high current density, and a low overpotential, and constitutes one step forward in the design of artificial photosynthetic systems.
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| 4. |
- Guo, Xuewen, et al.
(författare)
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Novel small-molecule zwitterionic electrolyte with ultralow work function as cathode modifier for inverted polymer solar cells
- 2018
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Ingår i: Organic electronics. - : ELSEVIER SCIENCE BV. - 1566-1199 .- 1878-5530. ; 59, s. 15-20
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Tidskriftsartikel (refereegranskat)abstract
- Interfacial compatibility between the electrode and organic semiconductor plays a critical role in controlling the charge transport and hence efficiency of organic solar cell. Here, we introduce a novel small-molecule zwitterionic electrolyte (S1) combined with ZnO as electron transporting interlayer employed for the inverted PTB7:PC71BM bulk heterojunction solar cell. The resulting device with the S1/ZnO stacked interlayer achieves a high PCE of 8.59%, obtaining a 16.2% improvement over the control device performance of 7.4% without the S1 attributed to the significant increased short-circuit current density and fill factor. The interfacial properties are investigated. It is found that the S1/ZnO interlayer possess an ultralow work function of 3.6 eV, which originates from the interfacial double dipole step induced by the zwitterionic side chain electrostatic realignment at interface. The S1/ZnO interlayer exhibits the excellent charge extraction ability, suppresses the charge recombination loss and decreases the series resistance at the active layer/electrode contact.
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| 5. |
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| 6. |
- Xiao, Wei, et al.
(författare)
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Exploring Red, Green, and Blue Light-Activated Degradation of Perovskite Films and Solar Cells for Near Space Applications
- 2020
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Ingår i: Solar RRL. - : Wiley-VCH Verlagsgesellschaft. - 2367-198X. ; 4:3
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Tidskriftsartikel (refereegranskat)abstract
- Hybrid perovskite solar cells with a high specific power have great potential to become promising power sources mounted on spacecrafts in space applications. However, there is a lack of study on their photostability as light absorbers in those conditions. Herein, the stability of the perovskite films and solar cells under red, green, and blue (RGB) light illumination in medium vacuum that belongs to near space is explored. The perovskite active layers exhibit different degradations from morphological, chemical, and structural points of view. This is attributed to the strong coupling between photoexcited carriers and the crystal lattice and the diversity of RGB light absorption in the perovskite films. Device characterizations reveal that the efficiency loss of perovskite solar cells results from not only perovskite degradation, but also the photoexcited carriers reducing the energy barrier of ion migration and accelerating the migration to generate more deep-level trap defects. Moreover, comparative devices suggest that the well encapsulation can weaken the effect of vacuum on stability.
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| 7. |
- Zhang, Yanqing, et al.
(författare)
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HflX is a ribosome-splitting factor rescuing stalled ribosomes under stress conditions
- 2015
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Ingår i: Nature Structural & Molecular Biology. - : Springer Science and Business Media LLC. - 1545-9993 .- 1545-9985. ; 22:11, s. 906-913
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Tidskriftsartikel (refereegranskat)abstract
- Adverse cellular conditions often lead to nonproductive translational stalling and arrest of ribosomes on mRNAs. Here, we used fast kinetics and cryo-EM to characterize Escherichia coil HflX, a GTPase with unknown function. Our data reveal that HflX is a heat shock-induced ribosome-splitting factor capable of dissociating vacant as well as mRNA-associated ribosomes with deacylated tRNA in the peptidyl site. Structural data demonstrate that the N-terminal effector domain of HflX binds to the peptidyl transferase center in a strikingly similar manner as that of the class I release factors and induces dramatic conformational changes in central intersubunit bridges, thus promoting subunit dissociation. Accordingly, loss of HflX results in an increase in stalled ribosomes upon heat shock, These results suggest a primary role of HflX in rescuing translationally arrested ribosomes under stress conditions.
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| 8. |
- Bao, Qinye, et al.
(författare)
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Energy Level Alignment of N-Doping Fullerenes and Fullerene Derivatives Using Air-Stable Dopant
- 2017
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Ingår i: ACS Applied Materials and Interfaces. - : AMER CHEMICAL SOC. - 1944-8244 .- 1944-8252. ; 9:40, s. 35476-35482
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Tidskriftsartikel (refereegranskat)abstract
- Doping has been proved to be one of the powerful technologies to achieve significant improvement in the performance of organic electronic devices. Herein, we systematically map out the interface properties of solution-processed air-stable n-type (4(1,3-dimethyl-2,3-dihydro-1H-benzoimidazol-2-yl)phenyl) doping fullerenes and fullerene derivatives and establish a universal energy level alignment scheme for this class of n-doped system. At low doping levels at which the charge-transfer doping induces mainly bound charges, the energy level alignment of the n-doping organic semiconductor can be described by combining integer charger transfer-induced shifts with a so-called double-dipole step. At high doping levels, significant densities of free charges are generated and the charge flows between the organic film and the conducting electrodes equilibrating the Fermi level in a classic "depletion layer" scheme. Moreover, we demonstrate that the model holds for both n- and p-doping of pi-backbone molecules and polymers. With the results, we provide wide guidance for identifying the application of the current organic n-type doping technology in organic electronics.
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| 9. |
- Bao, Qinye, et al.
(författare)
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The Effect of Oxygen Uptake on Charge Injection Barriers in Conjugated Polymer Films
- 2018
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Ingår i: ACS Applied Materials and Interfaces. - : AMER CHEMICAL SOC. - 1944-8244 .- 1944-8252. ; 10:7, s. 6491-6497
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Tidskriftsartikel (refereegranskat)abstract
- The energy offset between the electrode Fermi level and organic semiconductor transport levels is a key parameter controlling the charge injection barrier and hence efficiency of organic electronic devices. Here, we systematically explore the effect of in situ oxygen exposure on energetics in n-type conjugated polymer P(NDI2OD-T2) films. The analysis reveals that an interfacial potential step is introduced for a series of P(NDI2OD-T2) electrode contacts, causing a nearly constant downshift of the vacuum level, while the ionization energies versus vacuum level remain constant. These findings are attributed to the establishment of a so-called double-dipole step via motion of charged molecules and will modify the charge injection barriers at electrode contact. We further demonstrate that the same behavior occurs when oxygen interacts with p-type polymer TQ1 films, indicating it is possible to be a universal effect for organic semiconductOrs.
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| 10. |
- Cui, Peng, et al.
(författare)
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Hypothalamic DNA methylation in rats with dihydrotestosterone-induced polycystic ovary syndrome: effects of low-frequency electro-acupuncture.
- 2018
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Ingår i: Experimental physiology. - 1469-445X. ; 103:12, s. 1618-1632
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Tidskriftsartikel (refereegranskat)abstract
- What is the central question of this study? What is the role of hypothalamic DNA methylation in the development of PCOS and the response to electro-acupuncture treatment. What is the main finding and its importance? Global DNA methylation and expression of DNA methyltransferases (Dnmts) were increased in PCOS-like rats, and electro-acupuncture decreased global DNA methylation and Dnmt3b expression. Pyrosequencing showed that the DNA methylation of some PCOS candidate genes was changed in the PCOS and PCOS+EA groups, suggesting that hypothalamic DNA methylation plays an important role in the development of PCOS and in mediating the effects of electro-acupuncture treatment.Polycystic ovary syndrome (PCOS) is a common reproductive and endocrine disease of unknown etiology. Recently, epigenetic studies focusing on DNA methylation in PCOS have received much attention, but the mechanisms are still unclear. In the present study, we used the 5a-dihydrotestosterone-induced PCOS-like rat model and treated the rats with electro-acupuncture (EA). Rats were randomly divided into four groups - controls, diet-induced obesity (DIO), PCOS, and PCOS+EA. We examined the reproductive, metabolic, and behavioral phenotypes, validated the effect of EA, and explored the role of hypothalamic DNA methylation by analyzing the methylation of global DNA and selected candidate genes. The PCOS rats presented with reproductive dysfunctions such as lack of regular estrus cyclicity, metabolic disorders such as increased body weight and insulin resistance, and depression and anxiety-like behaviors. EA improved the reproductive functions, decreased body weight, and improved experimental depressive behavior. Furthermore, global DNA methylation and the expression of DNA methyltransferases (Dnmts) were increased in PCOS rats compared to the control group, and EA decreased the global DNA methylation and the expression of Dnmt3b. In addition, pyrosequencing showed that the DNA methylation of certain CpG sites in targeted genes (Plcg1, Camk2b, Esr2, and Pgr) was increased in the PCOS group, but the DNA methylation of Camk2b and Ar was decreased after EA treatment. These results indicate that hypothalamic DNA methylation might be correlated with the development of PCOS and that EA has an effect on hypothalamic DNA methylation in PCOS rats. This article is protected by copyright. All rights reserved.
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