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Zhang, Jinbao
Publications (10 of 29) Show all publications
Zhang, J., Hao, Y., Yang, L., Mohammadi, H., Vlachopoulos, N., Sun, L., . . . Sheibani, E. (2019). Electrochemically polymerized poly (3, 4-phenylenedioxythiophene) as efficient and transparent counter electrode for dye sensitized solar cells. Electrochimica Acta, 300, 482-488
Open this publication in new window or tab >>Electrochemically polymerized poly (3, 4-phenylenedioxythiophene) as efficient and transparent counter electrode for dye sensitized solar cells
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2019 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 300, p. 482-488Article in journal (Refereed) Published
Abstract [en]

A new conducting polymer poly (3, 4-phenylenedioxythiophene) is synthesized by the electrochemical polymerization technique with different solvents. We find that solvents used in electrochemical polymerization play important roles for the catalytic activity and morphology of the formed conducting polymers. The obtained poly (3, 4-phenylenedioxythiophene) is for the first time employed as counter electrode electrocatalyst in dye sensitized solar cells with cobalt-based electrolytes. We demonstrate that a polymer prepared from a mixed acetonitrile-dichloromethane solvent exhibit higher catalytic activity for redox reactions, as compared to that from a single solvent, dichloromethane. The devices based on this mixed solvent-based polymer from a mixed solvents show a high power conversion efficiency of 5.97%. An additional advantageous feature of the electrochemically polymerized poly (3, 4-phenylenedioxythiophene) for solar cell applications is the high transparency in the visible and nearinfrared region. We also investigate the beneficial effect of the poly (3, 4-phenylenedioxythiophene) layer thickness on device performance, and concluded that the series resistance and charge transfer resistance are greatly influenced by the thickness of polymer, as evidenced by electrochemical impedance spectroscopy measurements. The optimal thickness for poly (3, 4-phenylenedioxythiophene) is about 100 nm. Furthermore, the high catalytic activity and transparency of the new conducting polymer as counter electrode shows great promise for other optoelectronic applications.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2019
Keywords
poly(PheDOT), Counter electrode, Dye sensitized solar cells, Electrochemical polymerization
National Category
Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-378620 (URN)10.1016/j.electacta.2019.01.006 (DOI)000458488200057 ()
Funder
Swedish Research CouncilSwedish Energy Agency, 94016777
Available from: 2019-03-11 Created: 2019-03-11 Last updated: 2019-03-11Bibliographically approved
Delices, A., Zhang, J., Santoni, M.-P., Dong, C.-Z., Maurel, F., Vlachopoulos, N., . . . Jouini, M. (2018). New covalently bonded dye/hole transporting material for better charge transfer in solid-state dye-sensitized solar cells. Electrochimica Acta, 269, 163-171
Open this publication in new window or tab >>New covalently bonded dye/hole transporting material for better charge transfer in solid-state dye-sensitized solar cells
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2018 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 269, p. 163-171Article in journal (Refereed) Published
Abstract [en]

A novel metal-free organic dye based on triarylamine functionalized by a carbazole unit is synthesized and used in solid state dye sensitized solar cells (sDSC). The carbazole is co-polymerized with bis-EDOT by in-situ photo-electrochemical polymerization leading to a hole transporting polymer material covalently bonded to the light active centre. These first photovoltaic performances results are promising in sDSCs applications.

Keywords
Solid-state dye-sensitized solar cells, In-situ photoelectrochemical polymerization, Poly(3, 4-ethylenedioxythiophene), Hole transporting material, Covalently bonded dye/HTM
National Category
Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-351625 (URN)10.1016/j.electacta.2018.02.119 (DOI)000428806700020 ()
Available from: 2018-06-13 Created: 2018-06-13 Last updated: 2018-06-13Bibliographically approved
Xu, B., Zhu, Z., Zhang, J., Liu, H., Chueh, C.-C., Li, X. & Jen, A.-Y. K. -. (2017). 4-Tert-butylpyridine Free Organic Hole Transporting Materials for Stable and Efficient Planar Perovskite Solar Cells. ADVANCED ENERGY MATERIALS, 7(19), Article ID 1700683.
Open this publication in new window or tab >>4-Tert-butylpyridine Free Organic Hole Transporting Materials for Stable and Efficient Planar Perovskite Solar Cells
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2017 (English)In: ADVANCED ENERGY MATERIALS, ISSN 1614-6832, Vol. 7, no 19, article id 1700683Article in journal (Refereed) Published
Abstract [en]

4-Tert-butylpyridine (tBP) is an important additive in triarylamine-based organic hole-transporting materials (HTMs) for improving the efficiency and steady-state performance of perovskite solar cells (PVSCs). However, the low boiling point of tBP (196 degrees C) significantly affects the long-term stability and device performance of PVSCs. Herein, the design and synthesis of a series of covalently linked Spiro[fluorene-9,9'-xanthene] (SFX)-based organic HTMs and pyridine derivatives to realize efficient and stable planar PVSCs are reported. One of the tailored HTMs, N2, N2, N7, N7-tetrakis(4-methoxyphenyl)-3', 6'bis( pyridin-4-ylmethoxy) spiro[fluorene-9,9'-xanthene]-2,7-diamine (XPP) with two para-position substituted pyridines that immobilized on the SFX core unit shows a high power conversion efficiency (PCE) of 17.2% in planar CH3NH3PbI3-based PVSCs under 100 mW cm(-2) AM 1.5G solar illumination, which is much higher than the efficiency of 5.5% that using the well-known 2,2', 7,7'-tetrakis-(N, N-di-p-methoxy-phenyl-amine) 9,9'-spirobifluorene (SpiroOMeTAD) as HTM (without tBP) under the same condition. Most importantly, the pyridine-functionalized HTM-based PVSCs without tBP as additive show much better long-term stability than that of the state-of-the-art HTM SpiroOMeTAD- based solar cells that containing tBP as additive. This is the first case that the tBP-free HTMs are demonstrated in PVSCs with high PCEs and good stability. It paves the way to develop highly efficient and stable tBP-free HTMs for PVSCs toward commercial applications.

Keywords
efficiency, hole transport materials, planar perovskite solar cells, pyridine, stable
National Category
Physical Chemistry Materials Engineering
Identifiers
urn:nbn:se:uu:diva-341664 (URN)10.1002/aenm.201700683 (DOI)000414918700026 ()
Available from: 2018-02-15 Created: 2018-02-15 Last updated: 2018-02-15Bibliographically approved
Liu, P., Xu, B., Hua, Y., Cheng, M., Aitola, K., Sveinbjörnsson, K., . . . Kloo, L. (2017). Design, synthesis and application of a pi-conjugated, non-spiro molecular alternative as hole-transport material for highly efficient dye-sensitized solar cells and perovskite solar cells. Journal of Power Sources, 344, 11-14
Open this publication in new window or tab >>Design, synthesis and application of a pi-conjugated, non-spiro molecular alternative as hole-transport material for highly efficient dye-sensitized solar cells and perovskite solar cells
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2017 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 344, p. 11-14Article in journal (Refereed) Published
Abstract [en]

Two low-cost, easily synthesized pi-conjugated molecules have been applied as hole-transport materials (HTMs) for solid state dye-sensitized solar cells (ssDSSCs) and perovskite solar cells (PSCs). For X1-based devices, high power conversion efficiencies (PCEs) of 5.8% and 14.4% in ssDSSCs and PSCs has been demonstrated. For X14-based devices, PCEs were improved to 6.1% and 16.4% in ssDSCs and PSCs, respectively.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2017
Keywords
Hole-transport materials, Dye-sensitized solar cells, Perovskite solar cells
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-320214 (URN)10.1016/j.jpowsour.2017.01.092 (DOI)000395956300002 ()
Funder
Swedish Research CouncilSwedish Energy AgencyKnut and Alice Wallenberg Foundation
Available from: 2017-04-18 Created: 2017-04-18 Last updated: 2017-11-29Bibliographically approved
Zhang, X., Zhang, J., Xu, B., Wang, K. & Sun, X. W. (2017). Synergistic effects in biphasic nanostructured electrocatalyst: Crystalline core versus amorphous shell. Nano Energy, 41, 788-797
Open this publication in new window or tab >>Synergistic effects in biphasic nanostructured electrocatalyst: Crystalline core versus amorphous shell
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2017 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 41, p. 788-797Article in journal (Refereed) Published
Abstract [en]

The recent study on active amorphous catalytic materials provokes rethinking of the previous research on atomic and electronic structures in the crystalline catalyst. Is there any active catalyst with biphasic structure, in particular the integration of crystalline and amorphous components? Inspired by this question, a crystalline-amorphous biphasic quaternary oxide catalyst is novelly fabricated via one-step solvothermal method in this work. The as-prepared catalyst displays a well-designed coreshell architecture composed of crystalline Co(ZnxNi2-x)O-4 nanorod (core) and amorphous NiO nanosheet (shell). This heterogeneous coreshell catalyst exhibits high activity in the oxygen evolution reaction by demonstrating a low over-potential of 1.57 V vs RHE, a high half-wave potential (0.89 V vs RHE), and long-term electrochemical stability for 25 h. It is found that the synergistic effects from the amorphization of the shell on the one hand, and the atomic/electronic structure of the crystalline core on the other hand, could significantly facilitate the catalytic activity both at the surface and in the bulk volume of the solid oxides. Therefore, this new developed crystalline-amorphous biphasic catalyst could provide instructive roles in the future design of new catalysts for O-2 evolution and other catalytic reactions.

Keywords
Amorphous-crystalline, Morphology evolution, Bifunctional electrocatalyst, Core-shell nanostructures, Biphase
National Category
Nano Technology
Identifiers
urn:nbn:se:uu:diva-342592 (URN)10.1016/j.nanoen.2016.01.008 (DOI)000415302600087 ()
Available from: 2018-02-23 Created: 2018-02-23 Last updated: 2018-02-23Bibliographically approved
Xu, B., Zhang, J., Hua, Y., Liu, P., Wang, L., Ruan, C., . . . Sun, L. (2017). Tailor-Making Low-Cost Spiro[fluorene-9,9′-xanthene]-Based 3D Oligomers for Perovskite Solar Cells. Paper presented at 2017/12/13. Chem, 2(5), 676-687
Open this publication in new window or tab >>Tailor-Making Low-Cost Spiro[fluorene-9,9′-xanthene]-Based 3D Oligomers for Perovskite Solar Cells
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2017 (English)In: Chem, ISSN 2451-9294, Vol. 2, no 5, p. 676-687Article in journal (Refereed) Published
Abstract [en]

The power-conversion efficiencies (PCEs) of perovskite solar cells (PSCs) have increased rapidly from about 4% to 22% during the past few years. One of the major challenges for further improvement of the efficiency of PSCs is the lack of sufficiently good hole transport materials (HTMs) to efficiently scavenge the photogenerated holes and aid the transport of the holes to the counter-electrode in the PSCs. In this study, we tailor-made two low-cost spiro[fluorene-9,9?-xanthene] (SFX)-based 3D oligomers, termed X54 and X55, by using a one-pot synthesis approach for PSCs. One of the HTMs, X55, gives a much deeper HOMO level and a higher hole mobility and conductivity than the state-of-the-art HTM, Spiro-OMeTAD. PSC devices based on X55 as the HTM show a very impressive PCE of 20.8% under 100 mW·cm?2 AM1.5G solar illumination, which is much higher than the PCE of the reference devices based on Spiro-OMeTAD (18.8%) and X54 (13.6%) under the same conditions.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Nano Technology Physical Chemistry
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
urn:nbn:se:uu:diva-336393 (URN)10.1016/j.chempr.2017.03.011 (DOI)000408621100014 ()
Conference
2017/12/13
Available from: 2017-12-13 Created: 2017-12-13 Last updated: 2018-01-10Bibliographically approved
Zhang, X., Xu, B., Zhang, J., Gao, Y., Zheng, Y., Wang, K. & Sun, X. W. (2016). All-Inorganic Perovskite Nanocrystals for High-Efficiency Light Emitting Diodes: Dual-Phase CsPbBr3-CsPb2Br5 Composites. Advanced Functional Materials, 26(25), 4595-4600
Open this publication in new window or tab >>All-Inorganic Perovskite Nanocrystals for High-Efficiency Light Emitting Diodes: Dual-Phase CsPbBr3-CsPb2Br5 Composites
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2016 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 26, no 25, p. 4595-4600Article in journal (Refereed) Published
Abstract [en]

A dual-phase all-inorganic composite CsPbBr3-CsPb2Br5 is developed and applied as the emitting layer in LEDs, which exhibited a maximum luminance of 3853 cd m(-2), with current density (CE) of approximate to 8.98 cd A(-1) and external quantum efficiency (EQE) of approximate to 2.21%, respectively. The parasite of secondary phase CsPb2Br5 nanoparticles on the cubic CsPbBr3 nanocrystals could enhance the current efficiency by reducing diffusion length of excitons on one side, and decrease the trap density in the band gap on the other side. In addition, the introduction of CsPb2Br5 nanoparticles could increase the ionic conductivity by reducing the barrier against the electronic and ionic transport, and improve emission lifetime by decreasing nonradiative energy transfer to the trap states via controlling the trap density. The dual-phase all-inorganic CsPbBr3-CsPb2Br5 composite nanocrystals present a new route of perovskite material for advanced light emission applications.

Keywords
all-inorganic, efficiency, light-emitting diode, perovskites
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-301424 (URN)10.1002/adfm.201600958 (DOI)000379905800019 ()
Available from: 2016-08-23 Created: 2016-08-23 Last updated: 2017-11-28Bibliographically approved
Sveinbjörnsson, K., Aitola, K., Zhang, J., Johansson, M. B., Zhang, X., Correa-Baena, J.-P., . . . Johansson, E. M. J. (2016). Ambient air-processed mixed-ion perovskites for high-efficiency solar cells. Journal of Materials Chemistry A, 4(42), 16536-16545
Open this publication in new window or tab >>Ambient air-processed mixed-ion perovskites for high-efficiency solar cells
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2016 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 4, no 42, p. 16536-16545Article in journal (Refereed) Published
Abstract [en]

Mixed-ion (FAPbI(3))(1-x)(MAPbBr(3))(x) perovskite solar cells have achieved power conversion efficiencies surpassing 20%. However, in order to obtain these high efficiencies the preparation is performed in a controlled inert atmosphere. Here, we report a procedure for manufacturing highly efficient solar cells with a mixed-ion perovskite in ambient atmosphere. By including a heating step at moderate temperatures of the mesoporous titanium dioxide substrates, and spin-coating the perovskite solution on the warm substrates in ambient air, a red intermediate phase is obtained. Annealing the red phase at 100 degrees C results in a uniform and crystalline perovskite film, whose thickness is dependent on the substrate temperature prior to spin-coating. The temperature was optimized between 20 and 100 degrees C and it was observed that 50 degrees C substrate temperature yielded the best solar cell performances. The average efficiency of the best device was 17.6%, accounting for current-voltage (I-V) measurement hysteresis, with 18.8% performance in the backward scan direction and 16.4% in the forward scan direction. Our results show that it is possible to manufacture high-efficiency mixed-ion perovskite solar cells under ambient conditions, which is relevant for large-scale and low-cost device manufacturing processing.

National Category
Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-310043 (URN)10.1039/c6ta06912f (DOI)000387166900031 ()
Funder
Göran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of TechnologySwedish Energy AgencyÅForsk (Ångpanneföreningen's Foundation for Research and Development)Swedish Research Council FormasSwedish Research Council
Available from: 2016-12-09 Created: 2016-12-09 Last updated: 2018-01-31Bibliographically approved
Zhang, J., Xu, B., Johansson, M. B., Hadadian, M., Baena, J. P., Liu, P., . . . Hagfeldt, A. (2016). Constructive Effects of Alkyl Chains: A Strategy to Design Simple and Non-Spiro Hole Transporting Materials for High-Efficiency Mixed-Ion Perovskite Solar Cells. ADVANCED ENERGY MATERIALS, 6(13), Article ID 1502536.
Open this publication in new window or tab >>Constructive Effects of Alkyl Chains: A Strategy to Design Simple and Non-Spiro Hole Transporting Materials for High-Efficiency Mixed-Ion Perovskite Solar Cells
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2016 (English)In: ADVANCED ENERGY MATERIALS, ISSN 1614-6832, Vol. 6, no 13, article id 1502536Article in journal (Refereed) Published
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-300464 (URN)10.1002/aenm.201502536 (DOI)000379314700002 ()
Funder
Swedish Energy AgencyStandUpSwedish Research CouncilKnut and Alice Wallenberg FoundationSwedish Research Council Formas
Available from: 2016-08-09 Created: 2016-08-09 Last updated: 2016-08-25Bibliographically approved
Zhang, J., Vlachopoulos, N., Hao, Y., Holcombe, T. W., Boschloo, G., Johansson, E. M. J., . . . Hagfeldt, A. (2016). Efficient Blue-Colored Solid-State Dye-Sensitized Solar Cells: Enhanced Charge Collection by Using an in Situ Photoelectrochemically Generated Conducting Polymer Hole Conductor.. ChemPhysChem, 17(10), 1441-1445
Open this publication in new window or tab >>Efficient Blue-Colored Solid-State Dye-Sensitized Solar Cells: Enhanced Charge Collection by Using an in Situ Photoelectrochemically Generated Conducting Polymer Hole Conductor.
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2016 (English)In: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 17, no 10, p. 1441-1445Article in journal (Refereed) Published
Abstract [en]

A high power conversion efficiency (PCE) of 5.5 % was achieved by efficiently incorporating a diketopyrrolopyrrole-based dye with a conducting polymer poly(3,4-ethylenediothiophene) (PEDOT) hole-transporting material (HTM) that was formed in situ, compared with a PCE of 2.9 % for small molecular spiro-OMeTAD-based solid-state dye solar cells (sDSCs). The high PCE for PEDOT-based sDSCs is mainly attributed to the significantly enhanced charge-collection efficiency, as a result of the three-order-of-magnitude higher hole conductivity (0.53 S cm(-1) ) compared with that of the widely used low molecular weight HTM spiro-OMeTAD (3.5×10(-4)  S cm(-1) ).

National Category
Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-300746 (URN)10.1002/cphc.201600064 (DOI)000381177600006 ()26919196 (PubMedID)
Funder
Swedish Energy AgencyStandUpSwedish Research CouncilKnut and Alice Wallenberg Foundation
Available from: 2016-08-15 Created: 2016-08-12 Last updated: 2017-11-28Bibliographically approved
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