Beijing Key Laboratory for New Energy Materials and Devices

Beijing, China

Beijing Key Laboratory for New Energy Materials and Devices

Beijing, China

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Liu X.,Tianjin University | Zhang F.,Tianjin University | Sun M.,Tianjin University | Wang S.,Tianjin University | And 3 more authors.
Journal of Energy Chemistry | Year: 2016

Two electron-rich, solution-processable phenonaphthazine derivatives, 5,12-bis(N-[4,4'-bis-(phenyl) -aminophen-4''-yl])-phenonaphthazine (BPZTPA) and 5,12-bis(N-[4,4'-bis(methoxy-phenyl)aminophen-4''-yl]) -phenonaphthazine (MeO-BPZTPA) have been designed and employed in the fabrication of perovskite solar cells. BPZTPA and MeO-BPZTPA exhibit excellent thermal stabilities, hole mobilities (∼10-4 cm2/(V .s)) and suitable HOMO levels (-5.34 and -5.29eV, respectively) relative to the valence band of the CH3NH3PbI3 and Au work function, showing their potential as alternative hole-transporting materials (HTMs). Meanwhile, the corresponding mesoporous TiO2/CH3NH3PbI3/HTM/Au devices are investigated, and the best power conversion efficiency of 10.36% has been achieved for MeO-BPZTPA without using p-type dopant. © 2016.


Zhou N.,Chinese Academy of Sciences | Zhou N.,Beijing Key Laboratory for New Energy Materials and Devices | Zhou N.,Beijing National Laboratory for Condense Matter Physics | Zhou N.,CAS Institute of Physics | And 24 more authors.
Electrochemistry Communications | Year: 2012

A new TiO 2 photoanode with hierarchical pore distribution was first employed to fabricate PbS/CdS co-sensitized quantum dot-sensitized solar cell (QDSC). Under AM 1.5 illumination of 100 mW·cm - 2, up to 3.82% of light-to-electricity conversion efficiency has been achieved, higher than the reported results of PbS/CdS QDSCs so far. The effects of PbS SILAR cycles, CdS deposition time and film thickness on cell performance were investigated. Furthermore, comparison between this photoanode with large spherical voids and conventional photoanode with large size TiO 2 scattering layer was carried out. This kind of photoanode can provide good scattering ability and large surface area, which is suitable for QDs efficient deposition and electrolyte penetration, exhibiting potential application in highly efficient QDSCs especially with high photocurrent. © 2012 Elsevier B.V. All rights reserved.


Li F.,Chinese Academy of Sciences | Li F.,Beijing Key Laboratory for New Energy Materials and Devices | Li F.,CAS Institute of Physics | Chen G.,Chinese Academy of Sciences | And 17 more authors.
Catalysis Science and Technology | Year: 2013

A facile aqueous co-precipitation method is successfully introduced to synthesize ZnS-In2S3 solid solution (labeled In 2xZn3(1-x)S3, x = 0-1) and Cu2+ doped In1.4Zn0.9S3 (x = 0.7) solid solution (labeled Cu(y)/In1.4Zn0.9S3, y = 0-4%). Their band gap energies are dependent on the compositional x and y values. The photocatalytic hydrogen generation rate can be remarkably improved to 438 μmol h-1 for Cu(1%)/In1.4Zn0.9S3 solid solution, in comparison with 79 μmol h-1 for un-doped In1.4Zn0.9S3 solid solution. It is suggested that the coupling of the two traditional band engineering strategies of making solid solution and metal ion doping is beneficial to obtain an appropriate conduction band position and effective charge separation of Cu2+ doped In2xZn3(1-x)S3 solid solution, thus improve the photocatalytic activity. This work provides a new opportunity to design novel efficient photocatalysts for water splitting into hydrogen. This journal is © 2013 The Royal Society of Chemistry.


Shi J.,Chinese Academy of Sciences | Shi J.,Beijing Key Laboratory for New Energy Materials and Devices | Shi J.,CAS Institute of Physics | Xu X.,Chinese Academy of Sciences | And 14 more authors.
Applied Physics Letters | Year: 2015

The intrinsic charge response and hysteresis characteristic in the perovskite solar cell has been investigated by an electrically modulated transient photocurrent technology. An ultraslow charge response process in the timescale of seconds is observed, which can be well explained by the ion migration in the perovskite CH3NH3PbI3 film driven by multiple electric fields derived from the heterojunction depletion charge, the external modulation, and the accumulated ion charge. Furthermore, theoretical calculation of charge transport reveals that the hysteresis behavior is also significantly influenced by the interfacial charge extraction velocity and the carrier transport properties inside the cell. © 2015 AIP Publishing LLC.


Shi J.,Chinese Academy of Sciences | Shi J.,Beijing Key Laboratory for New Energy Materials and Devices | Shi J.,CAS Institute of Physics | Xu X.,Chinese Academy of Sciences | And 8 more authors.
Small | Year: 2015

The interfacial atomic and electronic structures, charge transfer processes, and interface engineering in perovskite solar cells are discussed in this review. An effective heterojunction is found to exist at the window/perovskite absorber interface, contributing to the relatively fast extraction of free electrons. Moreover, the high photovoltage in this cell can be attributed to slow interfacial charge recombination due to the outstanding material and interfacial electronic properties. However, some fundamental questions including the interfacial atomic and electronic structures and the interface stability need to be further clarified. Designing and engineering the interfaces are also important for the next-stage development of this cell. Interfaces in perovskite solar cells are reviewed and discussed as an approach to understand the origin of the remarkable performance in this semiconductor photovoltaic device, in which the interfacial atomic and electronic structures, charge dynamics, and interface engineering are included. This review shows the importance of the interfaces and brings a better understanding to the workings of this cell. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Wang S.,Chinese Academy of Sciences | Wang S.,Beijing Key Laboratory for New Energy Materials and Devices | Wang S.,CAS Institute of Physics | Zhang Q.-X.,Chinese Academy of Sciences | And 14 more authors.
Journal of Power Sources | Year: 2013

Natural polysaccharide Konjac glucomannan (KGM) is, for the first time, applied as the polymer matrix for thin film gel electrolyte in CdS/CdSe quantum dot-sensitized solar cells (QDSCs). The predominance of this thin film quasi-solid state QDSCs lies in the in-situ preparation of the electrolyte and Cu2S counter electrode in one step without mold, which can significantly simplify the cell fabrication process. The cell based on this electrolyte presents an energy conversion efficiency of 4.0% under AM 1.5 illumination of 100 mW cm-2 with excellent stability compared to that of liquid-based QDSCs. © 2012 Elsevier B.V. All rights reserved.


Zhao E.,Harbin Institute of Technology | Ma C.,CAS Institute of Physics | Ma C.,Chinese Academy of Sciences | Ma C.,Beijing Key Laboratory for New Energy Materials and Devices | And 10 more authors.
International Journal of Hydrogen Energy | Year: 2013

In order to reduce the polarization resistance of the cathode, we have developed one-dimensional (1D) nanostructured La0.8Sr 0.2Co0.2Fe0.8O3-δ (LSCF) tubes/Ce0.8Gd0.2O1.9 (GDC) nanoparticles composite cathodes for solid oxide fuel cell. Uniform LSCF/PVP composite nanofibers have been firstly synthesized by a single-nozzle electrospinning technique, followed by firing at 800 C for 2 h to form one-dimensional LSCF tubes. Subsequently, the GDC phases were introduced into tube structured LSCF scaffold pre-sintered on a GDC pellet by a multi-impregnation process. Electrochemical Impedance spectra reveal that nanostructured LSCF tubes/GDC nanoparticles composite cathodes have a better electrochemical performance, achieving area-specific resistances of 4.70, 1.12, 0.27 and 0.07 Ω cm 2 at 500, 550, 600 and 650 C for the composite of GDC and LSCF in a weight ratio of 0.52:1. The low ASR values are mainly related to its optimal microstructure with larger triple-phase boundaries and higher porosity. These results suggest that LSCF tube/GDC nanoparticle composite can be an alternative cathode material for intermediate temperature solid oxide fuel cell (IT-SOFC). © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Yang W.,CAS Institute of Physics | Yang W.,Chinese Academy of Sciences | Yang W.,Beijing Key Laboratory for New Energy Materials and Devices | Salim J.,Indiana University – Purdue University Indianapolis | And 12 more authors.
Electrochemistry Communications | Year: 2013

Porous flowerlike Co3O4 microspheres/Cu nanoparticles composite has been synthesized via a combined solvothermal method, subsequent thermal treatment and polyol process. Due to the 3D mesoporous structure, the resulting Co3O4 microspheres/Cu catalyst shows an efficient and stable bifunctional catalytic activity. The cobalt oxide-based catalysts show better performance during the discharging and charging processes at a current density of 0.05 mA cm- 2 compared with that of the Vulcan XC-72. The cell with this novel catalyst can be reversibly charged/discharged and has a good cycle performance. The preliminary results indicate that the Porous flowerlike Co3O4 microspheres/Cu nanoparticles composite is a promising material for a metal/air battery or a PEM fuel cell as an efficient and stable bifunctional catalyst. © 2012 Elsevier B.V.


Shi J.-J.,Chinese Academy of Sciences | Shi J.-J.,Beijing Key Laboratory for New Energy Materials and Devices | Shi J.-J.,CAS Institute of Physics | Dong W.,Beijing Institute of Graphic Communication | And 25 more authors.
Chinese Physics Letters | Year: 2013

Metal-insulator-semiconductor back contact has been employed for a perovskite organic lead iodide heterojunction solar cell, in which an ultrathin Al2O3 film as an insulating layer was deposited onto the CH3NH3PbI3 by atomic layer deposition technology. The light-to-electricity conversion efficiency of the devices is significantly enhanced from 3.30% to 5.07%. Further the impedance spectrum reveals that this insulating layer sustains part of the positive bias applied in the absorber region close to the back contact and decreases the carrier transport barrier, thus promoting transportation of carriers. © 2013 Chinese Physical Society and IOP Publishing Ltd.

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