CHEMICAL PHYSICS LETTERS
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2020
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IF 2.029
Chi Zhang,Jing Hui Zeng,Ye Feng Wang
Manganese doped titanium dioxide was synthesized using hydrothermal technique and applied to photo-anode films for quantum dot sensitized solar cells after combined with commercially available titania. The products and cells were characterized with XRD, TEM, and electrochemical methods. At the optimum Mn-doped TiO 2 content, an open circuit voltage of 0.61 V is received on CdS sensitized quantum dot solar cells with an overall efficiency of 2.9%. Mott-Schottky traces suggest that a more negative flat-band potential accounts for the higher voltage.
研究领域:
材料科学
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光电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2013
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IF 3.777
Xingtian Yin,Wenxiu Que,Duan Fei,Haixia Xie,Zuoli He
TiO 2 shell layer on the surface of ZnO nanowires (NWs) was synthesized by a layer by layer adsorption and reaction (LBLAR) method. Scanning electron microscopy image shows that the prepared ZnO–TiO 2 core–shell NW arrays have a similar morphology with the well-aligned ZnO core NW arrays, providing the LBLAR cycles is controlled within a certain number. The prepared ZnO–TiO 2 core–shell NW arrays were sensitized with CdS quantum dots to assemble quantum dots sensitized solar cells. Results indicate that a dramatic increase in open-circuit voltage and fill factor is achieved with an introduction of the TiO 2 shell layer with a thickness of about 7 nm, resulting in a substantial improvement of the overall energy conversion efficiency. A rapid electron transfer from the CdS QDs to the ZnO NWs and a reduced electron recombination rate due to the energy barrier occurred at the interface between the ZnO core and the TiO 2 shell are believed to contribute to the improved performance of the solar cells based on the ZnO–TiO 2 core–shell NW arrays. In addition, effects of the TiO 2 shell thickness on the performance of the as-fabricated devices are also discussed in detail.
研究领域:
材料科学
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能源技术
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纳米技术
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产品关联
DOI
高影响因子
OPTICS COMMUNICATIONS
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2015
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IF 1.449
Yibing Lin,Yu Lin,Yongming Meng,Yongguang Tu,Xiaolong Zhang
SnO 2 nanoparticles were synthesized by hydrothermal method and applied to photo-electrodes of quantum dots-sensitized solar cells (QDSSCs). After sensitizing SnO 2 films via CdS quantum dots , CdSe quantum dots was decorated on the surface of CdS/SnO 2 photo-electrodes to further improve the power conversion efficiency. CdS and CdSe quantum dots were deposited by successive ionic layer absorption and reaction method (SILAR) and chemical bath deposition method (CBD) respectively. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) were used to identify the surface profile and crystal structure of SnO 2 photo-electrodes before and after deposited quantum dots. After CdSe co-sensitized process, an overall power conversion efficiency of 1.78% was obtained in CdSe/CdS/SnO 2 QDSSC, which showed 66.4% improvement than that of CdS/SnO 2 QDSSC.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 7
·6656-6664
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IF 1.798
Lin Yibing,Lin Yu,Wu Jihuai,Zhang Xiaolong,Fang Biaopeng
In this study, after CdS quantum dots sensitized ZnO hierarchical spheres (ZnO HS), we used a simple process to deposit CdSe QDs on ZnO by spin-coating-based SILAR, and applied to photoanodes of quantum dots-sensitized solar cells. Before CdS and CdSe QDs deposition, the ZnO HS photoanodes were modified by Zn(CH 3 COO) 2 ·2H 2 O methanol solution to further enhance the open-circuit voltage and power conversion efficiency (PCE). The program of modifying photoanodes and the number of CdSe spin-SILAR cycles are evaluated on the optical and electrochemical properties of the cells. As a result, a high energy conversion efficiency of 2.49 % was obtained by using modified ZnO HS/CdS photoanode under AM 1.5 illumination of 100 mW cm −2 . And further decorated by the CdSe QDs, the ZnO HS/CdS/CdSe cell achieved a PCE of 5.36 % due to the modification of ZnO HS nanostructure, the enhanced absorption in the visible region, the lower recombination reaction and higher electron lifetime.
研究领域:
材料科学
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纳米技术
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能源科学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2023
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IF 5.9
Yi Jiang,Yile Dai,Xianfei Xie,Qing Wang,Jianfeng Dai
In this work, we propose a strategy that is different from the traditional technology of increasing the specific area of the TiO2 film to improve the carrying capacity of QDs in QDSSCs. Transparent anatase TiO2 films are prepared by improving the optical transmittance of the photoanode TiO2 film so that the attached QDs can capture more photons and improve the efficiency of utilizing QDs. This QDSSC preparation technology sacrifices part of QDs loading but improves the utilization efficiency of QDs. At the same time, the transparent bulk TiO2 film decreases the transmission distance of photogenerated charge carriers, reduces the cross-interface transport, optimizes the transmission path, and reduces the carrier capture composite rate compared with the TiO2 particle film. Therefore, it not only increases the Voc, FF, and PCE of QDSSCs to 0.628 V, 54.7, and 6.166%, respectively, but also has greater transparency. It meets the demand for solar cell transparency in practical applications and has a wider range of applications and better aesthetics. The mechanism simulation and theoretical analysis of photothermal conversion and electromagnetic mechanism show that the barrier of carrier transfer in bulk transparent anatase TiO2 is lower than the physical barrier between anatase TiO2 NPs. The advantages of the anatase transparent TiO2 film in the process of photogenerated charge carrier transmission are verified. It provides an idea for the development of QDSSCs. It also brings the technology of transparent TiO2 film to related fields.
研究领域:
材料科学
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光伏技术
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界面物理
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产品关联
DOI
高影响因子
SOLAR ENERGY
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2018
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IF 4.374
Lianjing Zhao,Leilei Zhao,Weinan Xue,Wenjuan Fang,Yuan Wang,Yan Li
To improve the catalytic activity of carbons in counter electrodes (CEs), Cu nanoparticles (NPs) were introduced into mesoporous N-doped carbons (N-C) derived from metal-organic frameworks (MOFs) to prepare the composites of N-C and Cu NPs (N-C@Cu) via impregnation and subsequent reduction method in this work. The obtained N-C@Cu composites with 2–4 nm Cu NPs uniformly distributing in N-C were deposited onto fluorine doped tin oxide (FTO) substrates by screen-printing to fabricate CEs in quantum dot solar cells (QDSCs). The N-C@Cu CEs exhibit higher electrocatalytic activity than both pristine N-C/FTO and commonly used Cu 2 S/FTO CEs, which could be ascribed to the synergistic effect between Cu x S NPs with the excellent electrocatalytic ability and MOF derived N-C with high graphitization, large hydrophilic surface as well as the abundant dopant active sites on the reduction of polysulfide. The superior performance of N-C@Cu composites results in an improved fill factor and a high short circuit current density. Based on optimized N-C@Cu CEs and Zn-Cu-In-Se quantum dot sensitizers, the QDSCs obtained present a promising power conversion efficiency of 9.23%, significantly superior to those of pristine N-C/FTO (7.20%) and Cu 2 S/FTO (8.89%) CEs based QDSCs.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
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2018
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IF 3.886
Xing Du,Lei Zhao,Xuan He,Hui Chen,Weixin Li,Wei Fang
Power conversion efficiency (PCE) of quantum dot-sensitized solar cells (QDSSCs) was boosted in a TiO 2 composite film (TCSF) with delicate design in structure where TiO 2 hierarchical porous film (THPF) situated on the top of TiO 2 nanorod arrays film (TNAF). In this case, TNAF could supply efficient scattering centers for high light harvesting and direct electrical pathways for fast electron transfer while the THPF could offer porous channels for loading high quantity of previously synthetized quantum dots (QDs) and facilitate the penetration of electrolyte. Meanwhile, in this specific configuration, the presence of anatase–rutile heterojunction at the interface could help the rutile TNAF layer to efficiently collect photo-injected electrons from the anatase THPF layer thus suppressing the recombination of electrons and holes in electrolyte. The results showed that the PCE of QDSSC based on the TNAF photoanode was about 1.4-fold higher ( η = 3.05%, J sc = 15.86 mA cm −2 , V oc = 0.602 V, FF = 0.319) than that of device based on pure THPF ( η = 2.20%, J sc = 13.82 mA cm −2 , V oc = 0.572 V, FF = 0.278).
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2020
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IF 6.215
Di Zhang,Sidong Zhang,Yanyan Fang,Dongmei Xie,Xiaowen Zhou,Yuan Lin
Introducing bifunctional linkers (COOH-R-SH) between TiO 2 electrodes and quantum dots (QDs) was an effective apprIntroducing bifunctional linkers (COOH-R-SH) between TiO 2 electrodes and quantum dots (QDs) was an effective approach in preparation of quantum dot-sensitized solar cells (QDSCs). Three types of linkers (4-mercaptobenzoic acid (MBA, R =phenyl), 3-thiophenecarboxylic acid (TPA, R =thiophene), and thioglycolic acid (TGA, R =alkyl)) were used to functionalize TiO 2 electrodes and prepare TiO 2 /CdSe QDSCs with photoelectric conversion efficiency (PCE) of 5.50%, 4.59% and 4.85%, respectively. Various properties of modified and blank TiO 2 electrodes, such as QDs loading, absorbance, work function, interfacial charge injection, recombination and their influence on PCE were investigated. In spite of low adsorption amounts of MBA on TiO 2 , the phenyl MBA-TiO 2 electrodes obtained the highest Cd content due to regular arrangement and strong affinity to QDs. The FTIR spectra proved strong interactions between MBA and TiO 2 electrodes, leading to fast electron injection from QDs to TiO 2 electrodes. The electron injection rate in MBA-TiO 2 electrodes was the same as blank-TiO 2 , larger than TGA- and TPA-ones. Work function of TiO 2 electrodes modified by linkers could reduce several eV , in which the MBA-one decreased less, corresponding to the highest applied potential difference. The open-circuit voltage-decay measurement demonstrated that the MBA-TiO 2 photoanodes had the least charge recombination. Enhanced light absorption capacity and fast electron injection rate were two key points for modified cell to improve short-circuit current, while low recombination and appropriate energy level positions increased open-circuit voltage. Those make MBA-TiO 2 photoanodes obtain the best efficiency of 5.50%. We expected this work to guide the selection of linkers for design and optimization of photoanodes interface of QDSCs.oach in preparation of quantum dot-sensitized solar cells (QDSCs). Three types of linkers (4-mercaptobenzoic acid (MBA, R =phenyl), 3-thiophenecarboxylic acid (TPA, R =thiophene), and thioglycolic acid (TGA, R =alkyl)) were used to functionalize TiO 2 electrodes and prepare TiO 2 /CdSe QDSCs with photoelectric conversion efficiency (PCE) of 5.50%, 4.59% and 4.85%, respectively. Various properties of modified and blank TiO 2 electrodes, such as QDs loading, absorbance, work function, interfacial charge injection, recombination and their influence on PCE were investigated. In spite of low adsorption amounts of MBA on TiO 2 , the phenyl MBA-TiO 2 electrodes obtained the highest Cd content due to regular arrangement and strong affinity to QDs. The FTIR spectra proved strong interactions between MBA and TiO 2 electrodes, leading to fast electron injection from QDs to TiO 2 electrodes. The electron injection rate in MBA-TiO 2 electrodes was the same as blank-TiO 2 , larger than TGA- and TPA-ones. Work function of TiO 2 electrodes modified by linkers could reduce several eV , in which the MBA-one decreased less, corresponding to the highest applied potential difference. The open-circuit voltage-decay measurement demonstrated that the MBA-TiO 2 photoanodes had the least charge recombination. Enhanced light absorption capacity and fast electron injection rate were two key points for modified cell to improve short-circuit current, while low recombination and appropriate energy level positions increased open-circuit voltage. Those make MBA-TiO 2 photoanodes obtain the best efficiency of 5.50%. We expected this work to guide the selection of linkers for design and optimization of photoanodes interface of QDSCs.
研究领域:
材料科学
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物理化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 14
·5374-5381
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IF 3.069
Qiqian Gao,Liying Wang,Xueyu Zhang,Lianfeng Duan,Xuesong Li,Xijia Yang,Wei Lü
While the power conversion efficiency (PCE) of quantum dot-sensitized solar cells (QDSSCs) is still far below their theoretical efficiency, we herein provide a method to improve the solar cell performance by using carbon nanoparticles as a template to construct TiO2 mesoporous photoanodes. Carbon nanoparticles are obtained by microwave synthesis and are further mixed with TiO2 nanoparticles as a paste, and the photoanodes are prepared by spin-coating followed by thermal treatment. In comparison to the photoanodes fabricated from pure TiO2 nanoparticles, the performance of the cells that are prepared from the carbon nanoparticle template assisted mesoporous TiO2 photoanodes show obvious improvement. The best performance is achieved with a carbon nanoparticle content of 15 wt% in the photoanode. A maximum PCE of 4.41% is achieved, giving a 35.3% enhancement in cell efficiency. Systematic investigations are carried out to reveal the role of the carbon nanoparticles in the photoanode performance and the corresponding mechanism is proposed.
研究领域:
材料科学
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能源科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 28
·期 3
·2867-2876
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IF 1.798
Yu Libo,Li Zhen,Song Hai
Based on translucent TiO 2 nanotube (NT) film, CdS quantum dots (QDs) were anchored onto TiO 2 NT film using different linker molecules including thioglycolic acid (TGA), mercaptopropionic acid (MPA) and cysteine via hydrothermal method. The CdS QDs sensitized TiO 2 NT (CdS/TiO 2 NT) electrodes were constructed to quantum dots-sensitized solar cells (QDSSCs). The photovoltaic performance analysis results of the QDSSCs show that the linker molecule plays a significant role in the solar cell performance. The QDSSC using cysteine as linker molecule exhibits best power conversion efficiency than the other QDSSCs using TGA or MPA as linker molecules. The incident photon-to-current conversion efficiency (IPCE) and the electrochemical impedance spectroscopy (EIS) analysis results indicate that amino group of cysteine may has two aspects of the role to improve the power conversion efficiency of the QDSSC, one is that the good charge transfer properties of the cysteine might depend on the good donor–acceptor abilities of the free electron pair of the amino group, another is that distance between the TiO 2 NT and the CdS QDs could be slightly decreased due to the cysteine could anchor the CdS QDs via both amino and thiol group.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2019
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IF 6.019
Qiu Zhang,Zhanbin Jin,Fengyan Li,Zhinan Xia,Yi Yang,Lin Xu
For boosting the power conversion efficiency (PCE) of quantum dot sensitized solar cells (QDSSCs), metal oxide (CoO) has been prepared via a facile mean and applied for CE materials in CdS/CdSe/ZnS QDSSCs. The electrochemical properties of the CoO counter electrode (CE) and photovoltaic performances of QDSSCs are investigated in detail. Under analogous sunlight illumination, compared with traditional Cu 2 S CE, the QDSSCs fabricated with CoO CE showed an obvious enhancement in cell properties and increased the power conversion efficiency (PCE) by 32.7%. A PCE of 6.02% was achieved by the QDSSCs with CoO CEs, which deliver a short circuit current density (J sc ) of 20.42 mA/cm 2 , open circuit voltage (V oc ) of 0.655 V and fill factor (FF) of 0.45. Research so far has shown that metal oxide (e.g. CoO) has many excellent properties, such as good electrical conductivity , outstanding catalytic activity , relatively small charge transfer resistance , large surface area and cost-effective, so it is very promising to be a CE material for QDSSCs.
研究领域:
材料科学
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能源研究
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
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2020
·Vol. 10
·期 4
·631
·
IF 4.324
Zhen Li,Libo Yu,Hao Wang,Huiwen Yang,Huan Ma
Light harvesting and electron recombination are essential factors that influence photovoltaic performance of quantum dots sensitized solar cells (QDSSCs). ZnO hollow microspheres (HMS) as architectures in QDSSCs are beneficial in improving light scattering, facilitating the enhancement of light harvesting efficiency. However, this advantage is greatly weakened by defects located at the surface of ZnO HMS. Therefore, we prepared a composite hollow microsphere structure consisting of ZnO HMS coated by TiO2layer that is obtained by immersing ZnO HMS architectures in TiCl4aqueous solution. This TiO2-passivated ZnO HMS architecture is designed to yield good light harvesting, reduced charge recombination, and longer electron lifetime. As a result, the power conversion efficiency (PCE) of QDSSC reaches to 3.16% with an optimal thickness of TiO2passivation layer, which is much higher when compared to 1.54% for QDSSC based on bare ZnO HMS.Keywords:TiO2passivation layer;ZnO hollow microspheres;quantum dots sensitized solar cells
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）