ELECTROCHIMICA ACTA
·
2012
·
IF 3.832
Xingtian Yin,Wenxiu Que,Duan Fei,Haixia Xie,Zuoli He,Gangfeng Wang
Strategies employed to fabricate an efficient photoanode with ZnO nanowires (NWs) arrays and CdS–CdSe co-sensitizers were investigated. A detailed procedure for growing long ZnO NWs which are suitable for the application in quantum dot sensitized solar cells was discussed, and several optimized parameters were obtained for fabrication of the ZnO NWs with large aspect ratio. CdS and CdSe layers were deposited on the surface of the ZnO NWs by a successive ionic-layer adsorption and reaction method and the deposition process was optimized according to the performance of the solar cells fabricated with the ZnO/CdS NWs and the ZnO/CdS/CdSe NWs arrays, respectively. The relationship between the thickness of the sensitizer layer and the performance of the devices was also discussed in detail. Transmission electron microscopy observation shows that ∼7 nm thick CdS layer and ∼5 nm thick CdSe layer can be easily achieved on the ZnO NWs at an optimal deposition condition. UV–vis absorption spectra demonstrate that the light absorption range of the ZnO/CdS/CdSe NWs can be almost extended to the whole visible range. Through an optimization of the photoanode fabrication, which mainly includes the synthesis of the ZnO NWs arrays and the deposition of the CdS and CdSe layers, a short circuit current density as high as 18.63 mA/cm 2 with an overall efficiency of 3.06% can be obtained for the resulting device.
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
RSC Advances
·
2017
·Vol. 7
·期 17
·10494-10502
·
IF 3.108
Yanming Zhao,Futai Lu,Jie Zhang,Yuze Dong,Bao Zhang,Yaqing Feng
How to graft co-sensitizers with different binding strengths onto TiO2 surfaces for enhancing the performance of dye-sensitized solar cells (DSSCs) has not been discussed very much. Herein a ruthenium-based sensitizer (N719) and a porphyrin molecule (LP-2) with complementary absorption spectra (300–750 nm) have been chosen to investigate how the dye loading procedure would influence the photovoltaic performance of co-sensitized solar cells. Interestingly, it is found that 54.7% of the loading amounts of pre-adsorbed LP-2 are replaced by the post-adsorption of N719. The replacement adsorption is not observed when the two molecules are loaded in reverse order, which is attributed to their different adsorption configurations and binding energies. The competitive adsorption between co-sensitizers is thus systematically investigated by UV-visible absorption spectroscopy, energy dispersive spectrometry (EDS) and electron probe microanalysis (EPMA). Upon optimization, the device sequentially sensitized with LP-2 and N719 exhibits efficiency (7.72%) enhancement of 38.6% and 18.0% compared with those fabricated with single LP-2 and N719, respectively. The results provide a new vision on the stepwise sensitization of TiO2 films using co-sensitizers with a difference in adsorption properties, suggesting that complementary spectral absorption of co-sensitizers can lead to excellent cell performance by choosing an appropriate dye loading procedure.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 71
·43290-43298
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IF 3.119
Xinxin Wang,Xiuhua Hang,Altan Bolag,Wu Yun,Tana Bao,Jun Ning,Hexig Alata,Tegus Ojiyed
Aiming to explore the relationship between the molecular structure and photovoltaic performance, three pyran isomer dyes DO, DM and DP were synthesized and applied as a co-sensitizer with N719 dye in dye-sensitized solar cells (DSCs). These sensitizers were investigated by theoretical calculation, UV-vis absorption spectroscopy and cyclic voltammetry measurement to understand their structure, optical and electrochemical properties. The DSC devices based on N719 and the co-sensitizers were characterized using I–V tests, incident photon-to-current conversion efficiency and electrochemical impedance spectroscopy measurements. As compared to the standard N719-based DSCs, the co-sensitization system of N719 and DM with the most sterical structure exhibited an enhancement of the power conversion efficiency (PCE) by 18% from 7.60% to 8.96%. Both the short-circuit photocurrent density (Jsc) and open-circuit voltage (Voc) of the co-sensitized systems were increased resulting from the better maintained N719 dye loading amount on TiO2 as well as the prevention of dye aggregation. Co-sensitization of the DO molecule with less steric hindrance reduced the desorbed N719 dye amount by half leading to a decline of the photo-harvesting ability and photocurrent generation in DSCs.
研究领域:
材料科学
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物理化学
✓ 已验证
DOI
PubMed
高影响因子
OPTICS COMMUNICATIONS
·
2015
·
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
DYES AND PIGMENTS
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2016
·
IF 4.055
Hao-Liang Cheng,Zu-Sheng Huang,Lingyun Wang,Herbert Meier,Derong Cao
Two novel zinc porphyrin dyes containing either benzotriazole or 2 H -[1,2,3]triazolo[4,5- c ]pyridine as auxiliary acceptors, respectively, were synthesized for dye-sensitized solar cells. These two auxiliary acceptors were firstly applied into porphyrin based dyes. The photophysical and electrochemical properties of the dyes were investigated. These two dyes show the whole visible light absorption when they are adsorbed on the TiO 2 film, which means that they are promising sensitizers for dye-sensitized solar cells. The absorption intensity of the triazolopyridine containing dye is higher than that of the benzotriazole containing dye, resulting in a better light harvesting. Thus, the dye-sensitized solar cell based on the former dye achieved higher conversion efficiency of 6.65% than the cell based on the latter dye (6.17%) with chenodeoxycholic acid as the coadsorbant.
研究领域:
材料科学
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光化学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2015
·Vol. 27
·期 2
·1457-1462
·
IF 1.569
Sun Yunfei,Yang Lili,Wei Maobin,Chen Gang,Che Guangbo,Yang Jinghai,Wang Zhe,Gao Zhiyuan
Well aligned CoS NRAs with different length have been grown on ITO substrates by a simple chemical method without any catalyst. The morphology properties of the as grown CoS nanostructures were investigated by SEM and TEM images. From the SEM results measured from the tilt-view, with the reaction time increasing, the length of CoS nanorods increased. However these CoS(6) NRAs partially aggregated, which will decrease the surface area of CoS NRAs. The optimized photovoltaic performance with a Voc of 0.66 V, a Jsc of 1.96 mA/cm 2 , an FF of 0.43, and a η of 0.64 % is obtained from the device based on CoS(4) ANRAs electrode. Although the quantum dot sensitized solar cells (QDSSCs) with CoS NRAs show smaller η values than that of the QDSSC with sputtered Pt counter electrode, the CoS material will be an efficient alternative for the Pt electrode due to its excellent catalytic ability and low cost.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Hongtao Wang,Yueyue Li,Chenchang Wang,Yuan Li,Jihao Bai,Yueying liu,Linsheng Zhou,Fengmin Liu,Kengo Shimanoe,Geyu Lu
As one of the most promising “next generation” alcohol fuels, n-pentanol brings convenience to our lives as well as challenges. Realizing real-time monitoring of n-pentanol is important to the health of workers in chemical plants. In this work, a series of Au nanoparticles functionalized ZnO nanorods were prepared by a facile one-step solvothermal method. The electronic sensitization and chemical sensitization of Au nanoparticles regulate the thickness of initial depletion layer of ZnO nanorods and increase the amount of adsorbed oxygen species on the surface. The gas-sensing results showed that 2 mol% Au nanoparticles functionalized ZnO nanorods exhibited the highest response of 71.8 to 4 ppm n-pentanol at 260 °C, and showed much higher response than other various saturated monohydric alcohols with different carbon chain lengths. Moreover, the sensor possessed ultra-fast response speed (1 s), excellent stability, and a certain ability of moisture resistance. The sensor was heated at 350 °C to promote the desorption of n-pentanol. The surface depletion layer model and energy band theory were used to explain the enhanced gas-sensing performance. This work provides a suitable candidate for real-time monitoring of n-pentanol in chemical plants.
研究领域:
材料科学
·
传感器技术
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纳米材料
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环境监测
·
职业健康
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-7
·
IF 2.584
Chen Zeng,Wei Chaochao,Li Shengjun,Diao Chunli,Li Wei,Kong Wenping,Zhang Zhenlong,Zhang Weifeng
SnO 2 nanosheet-structured films were prepared on a fluorine-doped tin oxide (FTO) substrate using ZnO nanosheet as template. The as-prepared SnO 2 nanosheets contained plenty of nano-voids and were generally vertical to the substrate. TiO 2 nanoparticles were homogeneously deposited into the intervals between the SnO 2 nanosheets to prepare a hierarchically structured SnO 2 /TiO 2 hybrid film. The hybrid films were co-sensitized with CdS and CdSe quantum dots. The sensitized solar cells assembled with the SnO 2 /TiO 2 hybrid film showed much higher photoelectricity conversion efficiency than the cells assembled with pure TiO 2 films. The lifetime of photoinduced electron was also investigated through electrochemical impedance spectroscopy, which showed that the SnO 2 /TiO 2 hybrid film electrode is as long as the TiO 2 film electrode.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 7
·2214-2221
·
IF 4.099
Qiang Wu,Juan Hou,Haifeng Zhao,Zhiyong Liu,Xuanyu Yue,Shanglong Peng,Haibin Cao
ZnS as an inorganic passivation agent has been proven to be effective in suppressing charge recombination and enhancing power conversion efficiency (PCE) in quantum dot-sensitized solar cells (QDSCs). In the present study, we constructed a novel TiO2/ZnS/CdS/ZnCdS/CdSe/ZnS photoelectrode via successive ionic layer adsorption and reaction (SILAR) and chemical bath deposition (CBD). The complementary effects of multi-ZnS layers on the optical and electrochemical performance of the QDSCs were systematically investigated. The multi-ZnS can not only facilitate the growth and distribution of QDs, but also suppress the different interface charge recombination effectively. We suggest that the formation of the ZnCdS intermediate layers via ion-exchange route during CBD process contributes to the higher photoelectrochemical cell performance of the QDSCs with the middle ZnS layer. When the three-layer ZnS was employed in CdS/CdSe co-sensitized system, the PCE reached 6.05%, which is much higher than that observed for solar cells with the conventional single ZnS treatments and the two layers inserted at the interface between CdS QDs and CdSe QDs and electrolyte (4.80% and 5.42%, respectively).
研究领域:
材料科学
·
纳米科技
·
光电子学
·
能源化学
·
半导体器件
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·
IF 3.7
Wen-Yuan Zhang,Yu-Xia Li,Wen-Le Zhang,Bo Wang,Xue-Qin Sun,Yu-Kui Hu,Jia-Cheng Liu
Dye-sensitized solar cells (DSSCs) are considered a promising solution to current energy challenges. In this study, three porphyrin sensitizers ZnP1–ZnP3 with donor-π-acceptor (D-π-A) configurations were synthesized. The donors included 9,9-dimethylfluorene, 4-biphenyl, and 1,1′:3′,1″-terphenyl groups, whereas alkynylbenzoic acid was used as the acceptor. The modification of the side alkyl chain addressed the poor solubility of the porphyrin sensitizer. The synthesized porphyrin sensitizers were structurally characterized by nuclear magnetic resonance, high-resolution mass spectrometry, and ultraviolet absorption spectroscopy. The introduction of electron donor groups into 1,1′:3′,1″-terphenyl and alkynylbenzoic acid into the acceptor group improved the light-harvesting ability of the sensitizer, increased the short-circuit photocurrent density, and enhanced cell efficiency ( η = 3.6%). Finally, density functional theory was used to verify the experimental results.
研究领域:
材料科学
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化学
·
可再生能源
✓ 已验证
DOI
高影响因子
Polymers
·
2020
·Vol. 13
·期 1
·113
·
IF 3.426
Zhihui Zhang,Zhengdong Zhao,Yujia Lu,Di Wang,Chengyu Wang,Jian Li
A CA-Eu(III) complex was synthesized by the coordination reaction of cellulose acetate (CA) and Eu3+to obtain a CA-Eu light conversion film. This product was then doped with Tb(III) to sensitize the luminescence of Eu3+, which could functionalize the CA film. FTIR and XPS showed that the oxygen atoms in C=O, C–O (O=C–O), and O–H were involved in the complexation with Eu3+and formed a Eu–O bond. SEM revealed that Eu3+filled in the pores of the CA film. By changing the experimental conditions, the best fluorescence performance was obtained at the CA: Eu3+ratio of 3:1 with a reaction time of 65 min. The energy transfer between Tb3+–Eu3+could be realized by doping Tb3+to enhance the luminescence of Eu3+. The best fluorescence performance of the CA-Eu-Tb light conversion film was at a Eu3+:Tb3+ratio of 3:1. Compared with the CA film, the light conversion film has high transparency, high tensile strength, and good flexibility. It can convert the ultraviolet light harmful to plants into red light that is beneficial to photosynthesis. This offers high efficiency and environmental protection in the field of agricultural films.Keywords:light conversion film;cellulose acetate;europium;sensitization
研究领域:
材料科学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Wen-Yuan Zhang,Yu-Xia Li,Wen-Le Zhang,Bo Wang,Xue-Qin Sun,Yu-Kui Hu,Jia-Cheng Liu
Porphyrin sensitizers were extensively studied due to their exceptional performance in dye-sensitized solar cells (DSSCs). In this study, three sensitizers (ZnP1, ZnP2, and ZnP3) with D-π-A structures containing heteroatom functional groups, such as triphenylamine, thianthrene and dibenzothiophene as electron donors, were designed and synthesized. The benzoic acid group, which functioned as an electron acceptor, and the strategically incorporated acetylene group enhance the light-harvesting abilities of the three sensitizers. Compared to ZnP2′s thianthrene and ZnP3′s dibenzothiophene, the incorporation of the triphenylamine electron donor in ZnP1 significantly improved electron transfer efficiency, short-circuit current density, and conversion efficiency. It also increased electron recombination resistance and prolonged electron lifetime, resulting in the best performance. Density functional theory (DFT) calculations confirmed these experimental findings.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）