Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy

Chongqing, China

Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy

Chongqing, China
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Zhou G.,Guizhou Institute of TechnologyGuizhou | Zhou G.,Southwest University | Zhou G.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy | Sun B.,Southwest Jiaotong University | And 4 more authors.
Composite Structures | Year: 2017

Composite particles (CPs) with an average diameter of 100 μm, containing the amorphous silicates, but crystal structures are dominated by the NaS2, Al2S3, Al0.55Mo2S4 and MoO3, are synthesized using hydrothermal method. Bipolar resistive switching (RS) memory behaviors with favorable resistance ON/OFF ratio, high retention and voltage cycling endurance performance are observed in the CPs-based device. The RS memory behaviors can be well controlled by stressing visible light at room temperature. The traps/deep traps based physical modes are proposed to interpret the RS memory behaviors for the quasi-bulk silicate-based composites. Different from conventional nano-scale RS memory device, the discovery of the RS memory behavior of micro-scale silicate composites may provide one new insight into the mechanism of resistive switching behavior. © 2017


Zhao X.,Southwest University | Zhao X.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy | Zhao J.,Southwest University | Wu R.,Xinjiang University | And 10 more authors.
Organic Electronics: physics, materials, applications | Year: 2017

Solvent additives are indispensable to achieve highly efficient organic solar cells. The additive residue is unavoidable especially when the devices are prepared at room temperature and atmospheric pressure. In this paper, we introduce 1,10-diiododecane (DID) as the additive, which has high boiling point, and investigate the effects of additive residue on the photodegradation of organic materials and photoelectric properties of solar cells after light illumination. The iodine from the residue of DID in the active layer could be confirmed by X-ray photoelectron spectroscope (XPS) measurements. Structural changes in the films upon illumination are probed using Fourier Transform Infrared Spectrometer (FTIR). The residual DID is found to dramatically decrease the photostability of the active layer and device performance under light illumination compared with those without additive residue, which are exemplified in current density–voltage (J-V) and electrochemical impedance measurements. Furthermore, the absorption of the film with additive residue is unchanged after light illumination, indicating that the conjugation of the polymer is not affected by the residue. © 2017


Li T.,Southwest University | Li T.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy | Tang D.,Southwest University | Tang D.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy | And 2 more authors.
International Journal of Hydrogen Energy | Year: 2017

Ionic liquid/carbon nanotubes (IL/CNTs) composite was applied as the precursor to prepare CNTs-supported cobalt phosphide via low-temperature phosphidation. CoP(MBMG)/CNTs, generated from N,N-bis(4-(methoxycarbonyl)benzyl)-N-methyl-d-glucaminium dibromodichlorocobaltate(II) (MBMG)2-CoCl2Br2), exhibits the best catalytic activity toward hydrogen evolution reaction with an onset overpotential of 55 mV, a Tafel slope of 58 mV dec-1, 95% Faradaic efficiency (FE), current densities of 10 and 20 mA cm-2 at overpotentials of 135 and 160 mV, and it can maintain the catalytic activity for at least 27 h. FT-IR, Raman spectroscopy, XPS and XRD were utilized to investigate the phosphidation process. All experimental results confirmed that anion from (MBMG)2-CoCl2Br2 can form CoP and glucaminium-based cation can become amorphous carbon after phosphidation to obtain the high HER activity of CoP(MBMG)/CNTs. © 2017 Hydrogen Energy Publications LLC.


Zhou G.,China Institute of Technology | Zhou G.,Southwest University | Zhou G.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy | Xiao L.,China Institute of Technology | And 4 more authors.
Journal of Alloys and Compounds | Year: 2017

Bilayer of NiOx/TiO2 thin film spin-coated and sputtering-deposited on the fluorine doped tin oxide (FTO) substrate is employed to develop a resistive random access memory device. An enhanced resistive switching (RS) behavior, which with appropriate resistance ratio of ∼103, switching cycle endurance for 102 and long retention time for 104 s, is observed in the bilayer NiOx/TiO2 based device. Construction of contact-potential barrier, formation and rupture of a localized conduction filaments and migration of oxygen vacancy existed in the interface near electrodes co-contribute to the enhanced RS memory effects, but the migration of Ag+, Ni2x+ and diffusion of oxygen vacancies are the dominated ones. This work might give an insight into the mechanism of RS memory behaviors of an oxide-stacked structure device. © 2017


Zhou G.,Southwest University | Sun B.,Southwest University | Sun B.,University of Hong Kong | Yao Y.,Southwest University | And 9 more authors.
Applied Physics Letters | Year: 2016

MoSe2-doped ultralong Se microwires of length/diameter ratio in the order of ∼240 are synthesized by hydrothermal method. An electronic resistive switching memory (ERSM) device using a single MoSe2-doped ultralong Se microwire is attained. The ERSM exhibits stable resistance ratio of ∼102 for 5000 s, highly stable performance during 500 stressing cycles, and excellent immunity to the frequency of the driving voltage. By investigating the dynamic processes of trap filling, de-trapping, and free-charge migration, trap-controlled space-charge-limited current mechanism is found to dominate the observed ERSM behaviour. © 2016 Author(s).


Chen L.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy | Chen L.,Southwest University | Zhang Q.,Southwest University | Lei Y.,Southwest University | And 7 more authors.
Physical Chemistry Chemical Physics | Year: 2013

In this work, we report our effort to understand the photocurrent generation that is contributed via electron-exciton interaction at the donor/acceptor interface in organic solar cells (OSCs). Donor/acceptor bi-layer heterojunction OSCs, of the indium tin oxide/copper phthalocyanine (CuPc)/fullerene (C60)/molybdenum oxide/Al type, were employed to study the mechanism of photocurrent generation due to the electron-exciton interaction, where CuPc and C60 are the donor and the acceptor, respectively. It is shown that the electron-exciton interaction and the exciton dissociation processes co-exist at the CuPc/C60 interface in OSCs. Compared to conventional donor/acceptor bi-layer OSCs, the cells with the above configuration enable holes to be extracted at the C60 side while electrons can be collected at the CuPc side, resulting in a photocurrent in the reverse direction. The photocurrent thus observed is contributed to primarily by the charge carriers that are generated by the electron-exciton interaction at the CuPc/C60 interface, while charges derived from the exciton dissociation process also exist at the same interface. The mechanism of photocurrent generation due to electron-exciton interaction in the OSCs is further investigated, and it is manifested by the transient photovoltage characteristics and the external quantum efficiency measurements. © 2013 The Owner Societies.


Liu H.,Hong Kong Baptist University | Wu Z.,Hong Kong Baptist University | Hu J.,Yunnan University | Song Q.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy | And 5 more authors.
Applied Physics Letters | Year: 2013

High performance inverted bulk heterojunction organic solar cells (OSCs), based on the blend of poly[[4,8-bis[(2-ethylhexyl)oxy] benzo [1,2-b:4,5-b′] dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-b]thiophenediyl]] (PTB7): 3′H-Cyclopropa[8,25] [5,6]fullerene-C70-D5h(6)-3′-butanoicacid, 3′-phenyl-, methyl ester (PC70BM), were achieved using an aluminum-doped zinc oxide (AZO) front transparent cathode. A structurally identical PTB7:PC70BM-based OSC having an indium tin oxide (ITO) front cathode was also made for comparison studies. The surface of AZO and ITO was modified with a 10 nm thick solution-processed ZnO interlayer to facilitate the efficient electron extraction. This work yielded AZO-based OSCs with a promising power conversion efficiency of 6.15%, slightly lower than 6.57% of a control ITO-based OSC, however, a significant enhancement in the stability of AZO-based OSCs was observed under an ultraviolet (UV)-assisted acceleration aging test. The distinctive enhancement in the lifetime of AZO-based OSCs arises from the tailored absorption of AZO electrode in wavelength <380 nm, serving as a UV filter to inhibit an inevitable degradation in ITO-based OSCs caused by the UV exposure. © 2013 AIP Publishing LLC.


Li P.,Southwest University | Li P.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy | Wang G.,Southwest University | Wang G.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy | And 18 more authors.
Physical Chemistry Chemical Physics | Year: 2014

In this work, we investigate the effect of the thickness of the polyethylenimine ethoxylated (PEIE) interface layer on the performance of two types of polymer solar cells based on inverted poly- (3-hexylthiophene) (P3HT):phenyl C61-butryric acid methyl ester (PCBM) and thieno[3,4-b]thiophene/ benzodithiophene (PTB7):[6,6]-phenyl C71-butyric acid methyl ester (PC71BM). Maximum power conversion efficiencies of 4.18% and 7.40% were achieved at a 5.02 nm thick PEIE interface layer, for the above-mentioned solar cell types, respectively. The optimized PEIE layer provides a strong enough dipole for the best charge collection while maintaining charge tunneling ability. Optical transmittance and atomic force microscopy measurements indicate that all PEIE films have the same high transmittance and smooth surface morphology, ruling out the influence of the PEIE layer on these two parameters. The measured external quantum efficiencies for the devices with thick PEIE layers are quite similar to those of the optimized devices, indicating the poor charge collection ability of thick PEIE layers. The relatively low performance of devices with a PEIE layer of thickness less than 5 nm is the result of a weak dipole and partial coverage of the PEIE layer on ITO. © the Owner Societies 2014.


Zhang T.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy | Zhang T.,Southwest University of Science and Technology | Huang J.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy | Huang J.,Southwest University of Science and Technology | And 10 more authors.
Solar Energy Materials and Solar Cells | Year: 2013

The free carrier generation processes at the interface formed by fullerene (C60) and perfluorinated hexadecafluorophthalo-cyaninatozinc (F 16ZnPc) are investigated in detail. It is found that the exciton dissociation and recombination across the interface can happen at the same C60/F16ZnPc interface. And it is demonstrated in this study that both processes can be the dominant process for photocurrent generation by simply changing the direction of the built-in electric field. The observed superlinear dependence between photocurrent and light intensity confirms that the photocurrent indeed is the second order to the incident light intensity. Thus the photocurrent can be generated from the exciton recombination across the C60/F16ZnPc interface. © 2013 Elsevier B.V.


Li T.,Southwest University | Li T.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy | Cui Z.,Southwest University | Cui Z.,Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy | And 4 more authors.
RSC Advances | Year: 2016

For the first time, five kinds of ionic liquid functionalized multi-walled carbon nanotubes (IL-MWCNTs) were applied as metal-free electrocatalysts for the hydrogen evolution reaction (HER). 1-Aminopropyl-3-methylimidazolium bromide functionalized MWCNTs demonstrate the best HER performance due to their strongest proton adsorption ability and conductivity for the fastest reduction kinetics. © The Royal Society of Chemistry 2016.

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