| 1. |
- Huang, Yuting, et al.
(författare)
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Host-Guest Strategy Enabling Nonhalogenated Solvent Processing for High-Performance All-Polymer Hosted Solar Cells
- 2023
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Ingår i: Chinese journal of chemistry. - : WILEY-V C H VERLAG GMBH. - 1001-604X .- 1614-7065. ; 41:9, s. 1066-1074
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Tidskriftsartikel (refereegranskat)abstract
- The power conversion efficiencies (PCEs) of all-polymer solar cells (all-PSCs), usually processed from low-boiling-point and toxic solvents, have reached high values of 18%. However, poor miscibility and uncontrollable crystallinity in polymer blends lead to a notable drop in the PCEs when using green solvents, limiting the practical development of all-PSCs. Herein, a third component (guest) BTO was employed to optimize the miscibility and enhance the crystallinity of PM6/PY2Se-F host film processed from green solvent toluene (TL), which can effectively suppress the excessive aggregation of PY2Se-F and facilitate a nano-scale interpenetrating network morphology for exciton dissociation and charge transport. As a result, TL-processed all-polymer hosted solar cells (all-PHSCs) exhibited an impressive PCE of 17.01%. Moreover, the strong molecular interaction between the host and guest molecules also enhances the thermal stability of the devices. Our host-guest strategy provides a unique approach to developing high-efficiency and stable all-PHSCs processed from green solvents, paving the way for the industrial development of all-PHSCs.
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| 2. |
- Shifeng, Li, et al.
(författare)
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Molecular Design of D-pi-A Type II Organic Sensitizers for Dye Sensitized Solar Cells
- 2012
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Ingår i: Chinese journal of chemistry. - : Wiley. - 1001-604X .- 1614-7065. ; 30:10, s. 2315-2321
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Tidskriftsartikel (refereegranskat)abstract
- Four new type II organic dyes with D-pi-A structure (donor-p-conjugated-acceptor) and two typical type II sensitizers based on catechol as reference dyes are synthesized and applied in dye sensitized solar cells (DSCs). The four dyes can be adsorbed on TiO2 through hydroxyl group directly. Electron injection can occur not only through the anchoring group (hydroxyl group) but also through the electron-withdrawing group (?CN) located close to the semiconductor surface. Experimental results show that the type II sensitizers with a D-pi-A system obviously outperform the typical type II sensitizers providing much higher conversion efficiency due to the strong electronic push-pull effect. Among these dyes, LS223 gives the best solar energy conversion efficiency of 3.6%, with Jsc=7.3 mA center dot cm-2, Voc=0.69 V, FF=0.71, the maximum IPCE value reaches 74.9%.
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| 3. |
- Wang, Chuanfei, et al.
(författare)
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Organic Semiconductor Interfaces and Their Effects in Organic Solar Cells
- 2023
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Ingår i: Chinese journal of chemistry. - : WILEY-V C H VERLAG GMBH. - 1001-604X .- 1614-7065.
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Forskningsöversikt (refereegranskat)abstract
- Energy levels and energy level alignment at interfaces play a decisive role in designing efficient and stable organic solar cells (OSCs). In this review two usually used technologies in organic photovoltaic communities for measuring energy levels of organic semiconductors, photoelectron spectroscopy and electrochemical methods, are introduced, and the relationships between the values obtained from the corresponding techniques are compared. The energy level and energy level alignment across the interfaces involved in solution processed organic photovoltaics are described, and the corresponding integer charge transfer model for predicting and explaining energy level alignment is presented. The effects of the interface properties in designing efficient binary and ternary OSCs were discussed. The effects of environmental factors mainly including water vapor, oxygen gas and thermal annealing on energy levels and energy level alignment involved in photoactive layers, and the subsequent effects on the corresponding OSC properties are given.
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| 4. |
- Wang, Hongyan, et al.
(författare)
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Photo-Induced Water Oxidation Based on a Mononuclear Cobalt(II) Complex
- 2014
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Ingår i: Chinese journal of chemistry. - : Wiley. - 1001-604X .- 1614-7065. ; 32:6, s. 467-473
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Tidskriftsartikel (refereegranskat)abstract
- Photo-induced water oxidation based on first row transition metal complexes has drawn much attention recently as a part of the efforts to design systems for solar fuel production. Here, the classic tetradentate ligand TPA (tris(2-pyridylmethyl)amine) is used together with cobalt(II) in CH3CN to form a mononuclear cobalt complex [Co(TPA)Cl]Cl. Single crystal X-ray diffraction shows that [Co(TPA) Cl] Cl is composed of discrete cationic units with a penta-coordinate cobalt center, along with chloride counter ions. In borate buffer, the Co complex acts as a water oxidation catalyst, as shown by the presence of a catalytic wave in electrochemistry. Under visible light irradiation, in the presence of photosensitizer and electron acceptor, the Co complex catalyzes O-2 evolution with a turnover frequency (TOF) of 1.0 mol(O-2)center dot mol(Co)(-1)center dot s(-1) and a turnover number (TON) of 55 mol(O-2)center dot mol(Co)(-1) in pH 8 borate buffer.
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| 5. |
- Xu, Guodong, et al.
(författare)
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Reducing Energy Loss and Morphology Optimization Manipulated by Molecular Geometry Engineering for Hetero-junction Organic Solar Cells
- 2020
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Ingår i: Chinese journal of chemistry. - : WILEY-V C H VERLAG GMBH. - 1001-604X .- 1614-7065. ; 38:12, s. 1553-1559
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Tidskriftsartikel (refereegranskat)abstract
- A Summary of main observation and conclusion Molecular geometry engineering is an effective strategy to control the micromorphology and molecular energy level in organic photovoltaics (OPVs). Two novel copolymers based on alkylsilyl- and chloride-functionalized benzodithiophene (BDT) were designed and synthesized for wide bandgap copolymer donor materials in OPVs. It was found that the two copolymers exhibited distinctly different properties in active layer when blended with fullerene-free acceptor IT-4F. The chloride-functionalized copolymer PBDTCl-TZ with deeper molecular energy level and better coplanar structure induced more ordered aggregation in blend film. Thus, the device based on PBDTCl-TZ exhibits better energy alignment with IT-4F and smaller radiative recombination. Furthermore, the non-radiative recombination of PBDTCl-TZ:IT-4F based device is about 45 mV lower than the PBDTSi-TZ:IT-4F based device, contributing to a lower energy loss (E-loss), and a higher open-circut voltage (V-OC). As a result, the devices based on the blend of PBDTCl-TZ:IT-4F exhibit a high power conversion efficiency (PCE) of up to 12.2% with a highV(OC)of 0.837 V, higher than that of PBDTSi-TZ:IT-4F, of which the PCE is 11.2% with a V-OC of 0.781 V.
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| 6. |
- Yao, Huifeng, et al.
(författare)
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Critical Role of Molecular Electrostatic Potential on Charge Generation in Organic Solar Cells
- 2018
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Ingår i: Chinese journal of chemistry. - : WILEY-V C H VERLAG GMBH. - 1001-604X .- 1614-7065. ; 36:6, s. 491-494
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Tidskriftsartikel (refereegranskat)abstract
- Revealing the charge generation is a crucial step to understand the organic photovoltaics. Recent development in non-fullerene organic solar cells (OSCs) indicates efficient charge separation even with negligible energetic offset between the donor and acceptor materials. These new findings trigger a critical question concerning the charge separation mechanism in OSCs, traditionally believed to result from sufficient energetic offset between the polymer donor and fullerene acceptor. We propose a new mechanism, which involves the molecular electrostatic potential, to explain efficient charge separation in non-fullerene OSCs. Together with the new mechanism, we demonstrate a record efficiency of similar to 12% for systems with negligible energetic offset between donor and acceptor materials. Our analysis also rationalizes different requirement of the energetic offset between fullerene-based and non-fullerene OSCs, and paves the way for further design of OSC materials with both high photocurrent and high photovoltage at the same time.
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| 7. |
- Yin, Y-G, et al.
(författare)
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Polymeric structure and solid NMR spectra of cadmuim (II) dialkyldithiophosphates (alkyl = propyl, butyl, isopropyl and isobutyl)
- 2003
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Ingår i: Chinese journal of chemistry. - : Wiley. - 1001-604X .- 1614-7065. ; 21:3, s. 291-295
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Tidskriftsartikel (refereegranskat)abstract
- By dropwise adding thio ligands to concentrated aqueous solutions of Cd(ClO4)26H2O, polymeric complexes, Cd(II) O,O′-dipropyl-dithiophosphate (1), O,O′-dibutyl- dithiophosphate (2), O,O′-diisopropyi-dithiophosphate (3) and O,O′-diisobutyl-dithiophosphate (4) were obtained. The structure of 4 was determined by X-ray diffraction analysis, showing that the metal ion sits in distorted tetrahedral sulphur coordination sphere and that the eight-membered bimetallic rings take the twist chair and boat conformations, alternately. Based on facts that the S(1)-Cd bond length [0.25099(12) nm] is shorter than the other S-Cd bond length [0.25399(12)-0.25701(18) nm] and that the S(1)-involving angles [113.45(4)°-118.43(5)°] are systematically larger than the normal angles of a tetrahedron, the ligands are hypothesized to be erratically functionalized to Cd(II). To certify the steric nonequivalence of ligands, the compounds were investigated by solid 13C, 31P and 113Cd NMR spectroscopy.
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| 8. |
- Zhang, P., et al.
(författare)
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Electrocatalytic Hydrogenation and Oxidation in Aqueous Conditions(dagger)
- 2020
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Ingår i: Chinese journal of chemistry. - : Shanghai Institute of Organic Chemistry. - 1001-604X .- 1614-7065. ; 38:9, s. 996-1004
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Tidskriftsartikel (refereegranskat)abstract
- Water molecule contains one oxygen and two hydrogen atoms, making it a potential oxygen and hydrogen source. Electrocatalytic organic reduction and oxidation using water as oxygen and/or hydrogen donors provide an environmentally friendly and sustainable strategy to replace traditional chemical-driven stoichiometric reactions that use sacrificial reagents. Furthermore, the development of electrochemical synthesis provides a potential application for low tension photoelectricity, which is not cost-effective during boosted voltage and application. In the last decade, electrocatalytic redox reactions of organic molecules in aqueous media had shown progress owing to the development of electrode materials and water-splitting technology. This paper highlights several electrocatalytic systems and corresponding mechanisms for both hydrogenation and oxidative transformation of representative compounds. The activation process of protons and water on the working electrode surface has received special focus. Furthermore, paired electrolysis using water as the oxygen and hydrogen source has been demonstrated. This paired system combines hydrogenation and oxidation half-reactions in one cell using water as the hydrogen and oxygen source, resulting in high atomic and electron utilization rates.
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| 9. |
- Zhiyun, Zhang, et al.
(författare)
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Novel Organic Dyes Based on Bulky Tri(triphenylamine)-Substituted Styrene for Dye-Sensitized Solar Cells
- 2012
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Ingår i: Chinese journal of chemistry. - : WILEY-V C H VERLAG GMBH. - 1001-604X .- 1614-7065. ; 30:12, s. 2779-2785
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Tidskriftsartikel (refereegranskat)abstract
- Three novel donor-p-acceptor (D-p-A) metal-free organic dyes (TB, TS and TF) based on tri(triphenylamine)-substituted styrene as donor with various conjugated linkers (benzene, thiophene and furan) were synthesized, characterized and used for the application of dye-sensitized solar cells (DSSCs). Under the same condition, The photo-to-electrical conversion efficiency of the DSSCs sensitized with TB, TS and TF reach 1.84%, 4.10% and 4.52%, respectively, which are lower than that sensitized with R1 (5.02%) with one triphenylamine unit. The results suggest that these bulky donor-based sensitizers are unfavorable to DSSCs.
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| 10. |
- Xie, Mingyi, et al.
(författare)
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Fluorescence of Single Conjugated Chains of MEH-PPV Dispersed in Polymer Matrix : What Do We See in the Microscope?†
- 2023
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Ingår i: Chinese Journal of Chemistry. - 1001-604X. ; 41:19, s. 2536-2544
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Forskningsöversikt (refereegranskat)abstract
- It has been a mystery that the detected fluorescence intensity of single MEH-PPV molecules is much lower than expected based on their chain length. In this review, after re-evaluating of the literature data in the light of new specially designed experiments, we present a comprehensive explanation of this issue: The actual size of MEH-PPV molecules at single molecule level is much smaller than expected due to de-aggregation and chain scission, while static quenching ("dark matter") also exists for large molecules, further reducing their brightness. (Figure presented.)
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