SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
·
IF 6.984
Jie Liu,Jianqiang Liu,Chenglei Wang,Zhongwei Ge,Dali Wang,Lixin Xia,Liang Guo,Na Du,Xiaotao Hao,Hongdi Xiao
The surface passivation strategy is one of the effective ways to improve the power conversion efficiency (PCE) of quantum dots-sensitized solar cells (QDSSCs). In this work, a novel ZnS/SiO 2 coating serves as the passivation layers for the CdS/CdSe co-sensitized solar cells based on zinc titanium mixed metal oxides (MMOs) obtained from layered double hydroxides (LDHs) precursor. The incorporation of passivation layers effectively improved the performance of the corresponding CdS/CdSe quantum dots co-sensitized solar cells and the best PCE of 4.91% has been achieved, which represents an over 55% improvement than that of devices without passivation. The effects of ZnS/SiO 2 double passivation layers were systematically investigated, especially by 2D time-resolved fluorescence imaging and electrochemical impedance spectroscopy technique . It was revealed that the existence of ZnS/SiO 2 outer layers caused the suppression of charge recombination, higher electrons collection efficiency, and superior surface quality.
研究领域:
材料科学
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能源技术
·
光电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 24
·10712-10724
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IF 3.553
Li Wenhua,Chen Qianqiao,Zhong Qin
The nickel sulfide (NiS) nanoparticles were anchored on the mesoporous graphitic carbon nitride (g-C 3 N 4 ) by one-pot calcination with sulfur powder as sulfur source and pore-forming agent. It is the first attempt to use the g-C 3 N 4 /NiS as a counter electrode (CE) for quantum-dot-sensitized solar cells. The g-C 3 N 4 /NiS co-catalyst based on 0.74 wt% NiS loading for S 2− n reduction obtained a low interface charge transfer resistance ( R ct ) of 1.08 Ω. The power conversion efficiency of the QDSSC assembled with ZnSe/CdS/CdSe/ZnSe-sensitized TiO 2 photoanode and g-C 3 N 4 /NiS CE is up to 5.64%, which is 3.05 times as high as that of pure g-C 3 N 4 CE. The enhancement of cell efficiency is attributed to the synergistic effects of excellent morphology of g-C 3 N 4 and its co-catalysis with NiS nanoparticles. The mesoporous architecture contributes a large specific surface area and fast electrolyte transfer channels, and the coupling of g-C 3 N 4 with NiS promotes the transfer of charge between the interface g-C 3 N 4 /NiS and electrolytes. The presented strategy for fabricating mesoporous architecture with g-C 3 N 4 /NiS uses low-cost raw materials and a simple preparation method, which provides a feasible route to enhance the electrocatalytic activity of g-C 3 N 4 .
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
RSC Advances
·
2025
·Vol. 15
·期 18
·14463-14476
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IF 4.6
Huu Phuc Dang,Le Tran,Le Huu Bao,Hanh Ngoc Thi Le
Developing cost-effective high-performance counter electrodes (CEs) is critical for improving the efficiency of quantum dot-sensitized solar cells (QDSSCs). In this study, a CNT@rGO@Cu2S composite CE was synthesized using a hydrothermal method, incorporating carbon nanotubes (CNTs), reduced graphene oxide (rGO), and Cu2S nanoparticles to enhance the charge transfer and catalytic activity. Structural characterization (XRD, Raman, FESEM, and HRTEM) confirmed the successful integration of the Cu2S nanoflowers within the rGO matrix. CNTs formed a conductive network that prevented rGO restacking and facilitated electron transport. Electrochemical analysis (CV, EIS, and Tafel polarization) demonstrated the superior electrocatalytic activity of the 6% CNT@rGO@Cu2S composite, exhibiting the highest exchange current density (J0) and lowest charge transfer resistance (Rct1), indicating efficient polysulfide redox reactions. When employed in QDSSCs with a CdS/CdSe co-sensitized photoanode, the 6% CNT@rGO@Cu2S CE achieved a power conversion efficiency (PCE) of 5.965%, surpassing those of rGO@Cu2S (5.322%) and conventional Pt-based CEs (1.96%). The superior performance is attributed to the optimized Fermi level alignment with the redox couple, enhanced charge mobility due to the CNTs, and improved electrolyte penetration.
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
PubMed
高影响因子
THIN SOLID FILMS
·
2021
·
IF 2.183
Mei Xin Chen,Ya Qian Bai,Xin Na Guan,Jia Wei Chen,Jing Hui Zeng
Surface passivation is a powerful route to enhance the photovoltaic performance of quantum dot sensitized solar cells. In the present work, we graft the well-established phosphating process in metal surface treating to form the passivation layer. The results show that the passivation layer formed by phosphate improves the photovoltaic performance of the solar cell significantly by inhibiting the internal charge recombination process. The charge transfer resistance ( R re ) of the ZnPh passivated solar cell is 19.22 Ω with a champion power conversion efficiency (PCE) of 4.50 %. Compared to the PCE of 3.37 % with 5.97 Ω in R re of the unpassivated reference cell, an efficiency enhancement of 33.5% is received.
研究领域:
材料科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Bin Bin Jin,Hui Sheng Huang,Shu Ying Kong,Guo Qing Zhang,Biao Yang,Chu Xing Jiang,Ya Zhou,Dan Jun Wang,Jing Hui Zeng
Antimony tin oxide (ATO)/lead selenide (PbSe) composite was rationally designed and fabricated on fluorine doped tin oxide glass (FTO) for using as counter electrode (CE) of quantum dot sensitized solar cells (QDSSCs). The electrocatalytic activity of the CE is deeply investigated in the polysulfide electrolyte by employing the Tafel, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) of the symmetrical cells. The results confirm that the ATO/PbSe CE has better electrocatalytic activity and stability than that of PbSe CE obtained by pulse voltage electrodeposition (PVD). The enhanced electrocatalytic performance of ATO/PbSe CE can be attributed to its high specific surface area, excellent permeability, conductivity and interface connectivity, which provide more electrocatalytic active sites for the reduction of polysulfide species, as well as fast channels for ions diffusion and electron transport . As a result, the CdS QDSSCs and CdS/CdSe co-sensitized QDSSCs assembled by the ATO/PbSe CE exhibits better power conversion efficiency ( η ) of 1.72% and 5.59%, respectively than that of PbSe CE obtained by PVD. Furthermore, photovoltaic property of the ATO/PbSe CE in CdS/CdSe co-sensitized QDSSCs keeps stable for over 200 min. This present work provides a simple and effective strategy for the construction of high-performance CE materials of QDSSCs.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
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2017
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IF 1.815
Xiu Wei Wang,Ye Feng Wang,Jing Hui Zeng,Feng Shi,Yu Chen,Jiaxing Jiang
Sensitizer loading level is one of the key factors determined the performance of sensitized solar cells. In this work, we systemically studied the influence of photo-anode thicknesses on the performance of the quantum-dot sensitized solar cells. It is found that the photo-to-current conversion efficiency enhances with increased film thickness and peaks at around 20 μm. The optimal value is about twice as large as the dye counterparts. Here, we also uncover the underlying mechanism about the influence of film thickness over the photovoltaic performance of QDSSCs from the light harvesting and charge recombination viewpoint.
研究领域:
材料科学
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光伏技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 26
·13526-13534
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IF 8.867
Ruijuan Dang,Yefeng Wang,Jinghui Zeng,Zhangjun Huang,Zhaofu Fei,Paul J. Dyson
A novel solid-state electrolyte based on 1,3-dihexylbenzimidazolium ([DHexBIm]) cations combined with Br−, BF4− or SCN− anions is used in CdS/CdSe sensitized quantum dot sensitized solar cells (QDSSCs). A power conversion efficiency of 4.26% was achieved with a fill factor of 56.44% using the [DHexBIm][SCN]-based electrolyte. X-ray powder diffraction analysis reveals that [DHexBIm][SCN] is crystalline with a much higher symmetry than the other two salts. Differential scanning calorimetry and thermal gravimetric analysis of [DHexBIm][SCN] reveals a solid–solid phase transition at 50 °C together with a high thermal stability. Current density–voltage (J–V) tests, Tafel-polarization plots, cyclic voltammetry curves and electrochemical impedance spectroscopic methods were used to characterize QDSSCs and to probe the mechanism of device performance. These studies show that good ionic conductivity and a low RCE value lead to a good short-current density (Jsc) of 12.58 mA cm−2, which is the major effect factor for the high power conversion efficiency observed. In the stability test, this device shows excellent long-term stability, maintaining 67% of the initial efficiency after 504 h.
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
JOURNAL OF NANOPARTICLE RESEARCH
·
2015
·Vol. 17
·期 3
·1-15
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IF 2.184
Liu Yingbo,Li Zhen,Yu Libo,Sun Shuqing
In this work, the influences of cationic precursors on the quality of photoelectrode, consequently on the performance of the quantum dot-sensitized solar cells (QDSCs) have been studied. CdS QDSCs have been prepared using successive ionic layer absorption and reaction (SILAR) method. Three cadmium precursors including nitrate (Cd(NO 3 ) 2 ), chloride (CdCl 2 ), and acetate (Cd(Ac) 2 ) were employed for the synthesis and absorption of CdS nanoparticles on nanostructure TiO 2 film. The loading amount and nanoparticle size of the CdS on mesoporous TiO 2 film showed a significant difference while using various cadmium precursors in the same SILAR cycles. Both the light-harvesting ability and the obtained incident photon-to-current conversion efficiency values show the trend of deposition rate caused by cadmium precursors. Further, it was proposed that an effective cationic precursor could provide a good connection between QD sensitizer and TiO 2 interface by electrochemical impedance spectroscopy analysis. Under AM 1.5 G full one sun illumination, the final power conversion efficiency of CdS QDSC based on Cd(Ac) 2 was 2.10 %, and PCE values of 1.57 and 1.20 % were obtained for solar cells sensitized by CdS QDs prepared by CdCl 2 and Cd(NO 3 ) 2 , respectively. The cationic precursor effect was further applied in PbS/CdS co-sensitized solar cells. The PbS/CdS QDSCs based on acetate cationic precursors provide a photocurrent of 19.24 mA/cm 2 and PCE of 3.23 % in comparison with 11.26 mA and 2.13 % obtained with nitrate acetate salts. Noticeably, the CdS and PbS/CdS QDSCs based on various cationic precursors prepared by SILAR exhibited good photocurrent stability under several light on–off cycles.
研究领域:
材料科学
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纳米技术
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能源研究
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 34
·8020-8026
·
IF 5.066
Shixun Wang,Ting Shen,Huiwen Bai,Bo Li,Jianjun Tian
Transition metal chalcogenide nanocrystals have increasingly been used in quantum dot-sensitized solar cells (QDSCs) as a counter electrode (CE) to improve their power conversion efficiency (PCE) due to their high catalytic activity. Herein, we report a Cu3Se2 nanostructured CE composed of nanorods and nanosheets for high efficiency QDSCs. Cu3Se2 nanocrystals were directly grown on the surface of fluorine-doped tin oxide (FTO) glass to form a double-layer morphology via the chemical bath deposition (CBD) process. Nanorod arrays with the height of 100 nm were covered by nanosheets with the size of approximately 500 nm. When the CBD time is 3 h, the QDSC shows the highest efficiency due to the excellent catalytic ability and conductivity of the Cu3Se2 CE. As a result, the PCE of the QDSCs using Cu3Se2 CE has the highest value of 5.05% and average value 4.96%, which are much higher than that of the solar cell using the conventional CE of compact CuxS (4.10% for the highest value and 4.06% for the average value). This is attributed to the large surface area, high conductivity and good electrocatalytic ability of the nanostructured Cu3Se2 CE.
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 Chemistry A
·
2016
·Vol. 4
·期 37
·14194-14203
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IF 8.262
Huiyun Wei,Guoshuai Wang,Jiangjian Shi,Huijue Wu,Yanhong Luo,Dongmei Li,Qingbo Meng
For quantum dot sensitized solar cells (QDSCs), optimizing interfacial structures by specifically developing new interfacial modification methods to minimize recombination associated with photo-generated carrier transportation and collection is an effective way to achieve highly efficient devices. In this respect, fumed SiO2 nanoparticles have been used as a polysulfide electrolyte additive for improving the interface in a TiO2/QDs/electrolyte for the first time. It was found that the fill factor (FF), open-circuit voltage (Voc) and the cell performance of the devices are significantly enhanced. Additionally, a power conversion efficiency (PCE) of 11.23% is achieved, which is one of the highest efficiencies for liquid-junction QDSCs. Furthermore, the electron transport and recombination processes in the CdSexTe1−x QDSCs with the SiO2 modified electrolyte have been investigated. This revealed that the existence of SiO2 nanoparticles in the electrolyte can create an energy barrier for the recombination between photo-generated electrons from the QDs as well as the recombination between the electrolyte and the injected electrons from TiO2. It is encouraging that CdSexTe1−x QDSCs in SiO2 modified electrolytes can reach a higher electron collection efficiency (98%) and longer electron lifetime. This work provides a simple and convenient method to modify the TiO2/QDs/electrolyte interfaces of QDSCs.
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
·
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
SUPERLATTICES AND MICROSTRUCTURES
·
2018
·
IF 2.099
Tianjiao Huang,Xiaoshan Zhang,Huan Wang,Xueting Chen,Lingling Wen,Meixin Huang,Yangshuai Zhong,Hui Luo,Guo Tang,Liya Zhou
In this paper, we developed a simple and convenient method for incorporating graphene with anatase-rutile TiO 2 composite and applied it as photoanode to improve the photovoltaic performance of CdS QDSSCs. Our research indicated in a CdS QDSSC system, the photoelectric conversion efficiency (PCE) of anatase-rutile TiO 2 (TGr0) composite photoanode was 86% higher than that rutile TiO 2 NRs. We also found that the PCE increased first and then decreased with the change of graphene content after the graphene was introduced into the anatase-rutile TiO 2 photoanode. When the ratio of optimized graphene/anatase TiO 2 particles composite that spin-coated on rutile TiO 2 NRs photoanode was 5%, we attained a maximum PCE of 2.20%, which was 178% and 50% higher than that pure TiO 2 NRs (0.79%) and TGr0 (1.47%), respectively.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）