ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Fangzhou Zhou,Fangqin Zeng,Xu Liu,Fangyang Liu,Ning Song,Chang Yan,Aobo Pu,Jongsung Park,Kaiwen Sun,Xiaojing Hao
Back contact modification plays an important role in improving energy conversion efficiency of Cu2ZnSnS4 (CZTS) thin film solar cells. In this paper, an ultrathin carbon layer is introduced on molybdenum (Mo)-coated soda lime glass (SLG) prior to the deposition of CZTS precursor to improve the back contact and therefore enhance CZTS solar cell efficiency. By introducing this layer, the short circuit current (Jsc) and device conversion efficiency increase for both nonvacuum (sol–gel) and vacuum (sputtering) methods. Specifically, for the sol–gel based process, Jsc increases from 13.60 to 16.96 mA/cm2 and efficiency from 4.47% to 5.52%, while for the sputtering based process, Jsc increases from 17.50 to 20.50 mA/cm2 and efficiency from 4.10% to 5.20%. Furthermore, introduction of this layer does not lead to any deterioration of either open circuit voltage (Voc) or fill factor (FF).
研究领域:
材料科学
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太阳能技术
·
薄膜电池研究
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Mengping He,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Yuena Meng,Sixin Wu
The earth-abundant Cu2ZnSnS4 (CZTS) quantum dots (QDs) have emerged as one potential substitute to toxic cadmium or rare indium QDs, but their application in quantum dot-sensitized solar cells (QDSSCs) is still limited by the improper particle size and the rigorous synthesis and ligand exchange conditions. Herein, we developed a one-pot hot injection method by using Tri-n-octylphosphine oxide (TOPO) as the solvent and oleylamine as the capping agent to synthesize Cu2ZnSn(S,Se)4 (CZTSSe) QDs with adjustable size and narrow size distribution. The key feature of this approach is that we can take advantage of the high-temperature nucleation, low-temperature growth, and strong reducibility of NaHB4 to prepare small-sized CZTSSe QDs without using 1-dodecanethiol (DDT) and to extend the light harvesting range through Se incorporation. After Se incorporation, it turns out that the conduction band (CB) level of CZTSSe QDs decreases, implying that the injection driving force of the electron to the CB of TiO2 films becomes weaker and a larger recombination would be induced at the TiO2/QDs/electrolyte interface. Benefiting from the broadened optoelectronic response range, the induced higher Jsc (16.80 vs 14.13 mA/cm2) finally leads to the increase of the conversion efficiency of CZTSSe QDSSC from 3.17% to 3.54% without further modification. Despite the fact that the efficiency is still far behind those of literature reported values through use of other chalcogenide sensitizers, this DDT-free approach solves the main hindrance for the application of CZTSSe QDs in QDSSCs and holds a more convenient way for ligand exchange, light absorption improvement, and particle size control.
研究领域:
材料科学
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能源技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Shaoping Chen,Yachao Wang,Yaning Wang,Wenhao Fan,Jingyun Guo,Jie Chen,Yu Jiang,Rasha Abdullah Ahmed Al-Yusufi,Zuhair A. Munir
In addition to the thermal and electrical characteristics of the thermoelectric material , the energy conversion efficiency of TE devices is influenced by other factors including the interface resistance, which in turn is affected by chemical changes or mechanical failure. We have investigated the use of FeTe as an electrode for iodine-doped PbTe. The telluride of iron has CTE and work function values that match well with those of PbTe. The FeTe/PbTe contact was determined as ohmic in nature with low resistance. Contact resistance and shear strength values were determined over aging times of up to 400 h at 573 K and were found to be nearly unchanged. In contrast, samples in which Fe was used as electrode showed significant decrease in shear strength and a significant increase in joint resistivity over the same aging conditions. From the electrical and thermal characterization, the conversion efficiency of the FeTe/Pb 1.0004 Te 0.997 I 0.003 /FeTe single leg was determined as 4.678% for T h = 673 K and T c = 300 K.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 19
·2000754
·
IF 4.948
Wenzhong Fang,Pan Wang,Zitao Ni,Tao Sun,Chaoyu Xiang,Kun Yue,Rongfei Wang,Jie Yang,Yao Zhou,Chong Wang,Yu Yang
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole injection layer plays an important role in planar Si/PEDOT:PSS heterojunction solar cells (HSCs). Herein, a MoO x mixed aqueous PEDOT:PSS cosolvent is developed and is applied into a Si/PEDOT:PSS solar cell preparation via a time-saving one-step spin-coating method. With an optimal concentration of MoO x dopants, the power conversion efficiency of the device exhibits from 10.26% up to 13.82% with all inherent photovoltaic parameters enhanced. The detailed characterization and analytical results indicate that an advanced electronic property is produced by MoO x dopants and interface optimization caused by synergistic effects from Mo 5+ and Mo 6+ species with PEDOT:PSS, which enhances its interface work function and promotes hole transportation capacity. The result paves a path for exploring efficient Si/PEDOT:PSS HSCs with suitable functional material and a simple solution-processable method.
研究领域:
材料科学
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光伏技术
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有机电子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiaoqing Yang,Huimin Xiang,Jianying Huang,Chuan Zhou,Ran Ran,Wei Wang,Wei Zhou,Zongping Shao
Lead-free inorganic Cs 2 AgBiBr 6 double perovskites have emerged as promising materials in perovskite solar cells (PSCs) to tackle the inferior stability and toxicity issues of organic–inorganic hybrid PSCs. However, the power conversion efficiencies (PCEs) of Cs 2 AgBiBr 6 solar cells are remarkably restricted by the intrinsic and extrinsic defects of Cs 2 AgBiBr 6 films. More specifically, the fast crystallization process in the formation of Cs 2 AgBiBr 6 films strongly prevents the homogeneous growth of perovskite crystals, leading to inferior Cs 2 AgBiBr 6 film quality. This work introduces a facile strategy to retard the crystallization of Cs 2 AgBiBr 6 perovskites by introducing Lewis base additives into the precursor solution. The incorporation of a strongly coordinated thiourea additive with a sulfur donor leads to the generation of a Lewis acid base adduct, which retards the crystallization process for Cs 2 AgBiBr 6 crystals, improves the quality of the Cs 2 AgBiBr 6 film, decreases the defect density and inhibits charge carrier recombination. After optimization, the cell delivers a superior PCE of 3.07%, surpassing that reported for most Cs 2 AgBiBr 6 -based solar cells in the literature, and exhibits outstanding stability with a PCE retention rate of 95% after 20 days of storage in air. This work provides an effective strategy for further improvements in the performance of inorganic lead-free Cs 2 AgBiBr 6 -based photovoltaic cells .
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 2
·1008-1012
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IF 1.134
Zhao Xiao-Chong,Wu Dong-Xue,Yang Li-Jun,Tang Jun,Yue Guo-Zong,Yang Pan
Institute of Materials, Chinese Academy of Engineering Physics, Jiangyou 621908, P. R. China To improve the stability of organic–inorganic hybrid perovskite, cesium-containing methylammonium lead iodide perovskite have been synthesized by one-step solution deposition. With the
increasing of Cs+ doping concentration, direct optical band gap of perovskite was increases, while defects and roughness of perovskite thin films were gradually augmented. A certain amount of Cs+ incorporated in perovskite absorb layer could improve power conversion efficiency
through the enhancing of open circuit voltage and fill factor. However, excessive Cs+ doping concentration results in the reduced of short-circuit current and fill factor, which reduced power conversion efficiency. The optimized ratio 10% Cs+ doping achieved the highest
power conversion efficiency (16.84%).
研究领域:
材料科学
·
能源工程
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DOI
PubMed
高影响因子
ACS Omega
·
2024
·
IF 3.7
Xiaoyan Gan,Kegui Li,Longtao Du,Ruoqi Wang,Yuge Chang,Liling Guo,Hanxing Liu
This study explores the optimization of (TMA)2MA4Pb5I16 perovskite films by regulating the film quality through the addition of MACl and MAAc additives. We found that adding MACl resulted in a film of larger grains with a power conversion efficiency (PCE) of 5.34%, while excessive MACl led to the formation of low-dimensional phases. Adding 7.5% MAAc improved the film quality with a PCE of 5.64%, although excessive MAAc induces pores and smaller grains. To address these issues, we proposed the combined use of MACl and MAAc additives, resulting in films with a larger grain size, smoother surface, and denser structure. Remarkably, the addition of MAAc + MACl achieved a champion PCE of 8.86% with good reproducibility. Mechanism studies revealed that TMA and MAAc formed a stable complex with PbI2 in solution, disrupting nucleation laws and promoting the formation of nuclei, leading to denser films with smaller grains. Additionally, the MACl treatment effectively promoted grain growth, resulting in high-quality films. This study presents novel insights into dual additive usage and their role in film crystallization, offering valuable guidance for the preparation of high-performance perovskite films.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
OPTICAL ENGINEERING
·
2025
·
IF 1.2
Xianzhen Huang,Yun Ye,Jiaqi Gao,Xingke Zheng
Color conversion layers are extensively utilized in flat panel display technology for their capacity to provide a wide color gamut and improved resolution, along with exceptional design flexibility. The uniformity and thickness of cadmium selenide (CdSe) quantum dot (QD) films are often difficult to control in the preparation of color conversion layers. Interestingly, it is possible to precisely deposit QDs by inkjet printing to improve material utilization. Color conversion layers with optimized spectral properties and light conversion efficiency are successfully prepared by inkjet printing. We employ inkjet printing technology to fabricate CdSe QD color conversion layers with precise control over layer thickness. The effects of layer thickness on spectral properties and light conversion efficiency are systematically investigated. It is found that a layer thickness of 5.5 μm achieves the highest light conversion efficiency at 20.4%, with efficiency decreasing as thickness increases to 6 μm. In addition, it is observed that blue light transmittance decreases from 47.2% to 11.4% with increasing layer thickness, highlighting the importance of thickness control in optimizing spectral properties.
研究领域:
材料科学
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显示技术
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产品关联
DOI
高影响因子
ACS Nano
·
2021
·
IF 15.881
Sisi Liu,Kao Xiong,Kang Wang,Guijie Liang,Ming-Yu Li,Haodong Tang,Xiaokun Yang,Zhen Huang,Linyuan Lian,Manlin Tan,Kai Wang,Liang Gao,Haisheng Song,Daoli Zhang,Jianbo Gao,Xinzheng Lan,Jiang Tang,Jianbing Zhang
Infrared (IR) solar cells are promising devices for significantly improving the power conversion efficiency of common solar cells by harvesting the low-energy IR photons. PbSe quantum dots (QDs) are superior IR photon absorbing materials due to their strong quantum confinement and thus strong interdot electronic coupling. However, the high chemical activity of PbSe QDs leads to etching and poor passivation in ligand exchange, resulting in a high trap-state density and a high open circuit voltage (VOC) deficit. Here we develop a hybrid ligand co-passivation strategy to simultaneously passivate the Pb and Se sites; that is, halide anions passivate the Pb sites and Cd cations passivate the Se sites. The cation and anion hybrid passivation substantially improves the quality of PbSe QD solids, giving rise to an excellent trap-state control and prolonged carrier lifetime. A high VOC and a high short circuit current density (JSC) are achieved simultaneously in the IR QD solar cells based on this hybrid ligand treatment. Finally, a IR-PCE of 1.31% under the 1100-nm-filtered solar illumination is achieved in the PbSe QD solar cells, which is the highest IR-PCE for PbSe QD IR solar cells at present. Additionally, the PbSe QD devices show a high external quantum efficiency of 80% at ∼1295 nm.
研究领域:
材料科学
·
太阳能技术
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Yueli Liu,Qitao Li,Wenchao Zhang,Zifan Yang,Sijie Zhao,Wen Chen
All-inorganic CsPbI3 perovskite quantum dots (QDs) have attracted great attention since emerging as a new class of materials with superior light-harvesting properties and enhanced thermal stability compared to organic–inorganic hybrid perovskites. However, poor phase stability remains a bottleneck for practical applications. In the present work, CsPb(I1–xBrx)3 perovskite QDs are synthesized by Br doping to increase the tolerance factor for the improvement of phase stability, and the balance between the stability of solar cells and the power conversion efficiency (PCE) is considered by adjusting the Br doping content. It is found that the phase stability of CsPb(I1–xBrx)3 QDs is much improved, while their band gap increases from 1.77 to 1.89 eV when the Br doping content increases from 0 to 30%. CsPbI2.4Br0.6 QD-based perovskite solar cells (PSCs) achieve a proper balance between high PCE and stability; the PCE is 12.31%, approaching that of the CsPbI3-based PSCs (14.13%), and may retain 87% of the initial efficiency after 15 days of storage in ambient air.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 22
·13203-13211
·
IF 2.599
Zhang Li-Ying,Zhang Yong,Guan Wei-Bao,Wang Ke-Fan,Cheng Zhen-Xiang,Wang Yuan-Xu
Perovskite solar cells single-doped with Br − or Cs + ions have been proved to be an effective approach to improve their efficiency and stability. In our work, we took advantage of co-doping with Br − and Cs + . At our studied doping levels from CH 3 NH 3 I:PbI 2 :CsBr = 1:1:0 ( x = 0) to 0.85:1:0.15 ( x = 0.15), CsBr doping does not introduce any detectable impurity, and the crystal grains grow larger with increasing CsBr doping level. Furthermore, when the CsBr doping level is less than x = 0.1, it can progressively enhance the optical absorption of the perovskite film, although the absorption begins to decrease when the doping level rises above x = 0.1. X-ray photoelectron spectroscopy measurements show that Br − has successfully replaced I − and bonds with Pb 2+ after CsBr doping. At the optimized doping level of x = 0.1, the incorporation of CsBr in the reaction system can improve the morphology of perovskite films and greatly enhance the efficiency from 9.8% for undoped sample to 13.6%, better than single Br − or Cs + doping. Our result shows that CsBr doping is an effective method to enhance the efficiency of perovskite solar cells.
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
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2015
·Vol. 20
·期 1
·29-36
·
IF 2.446
Meng Ling,Liu Yingru,Zhang Jingbo,Bai Shouli,Luo Ruixian,Chen Aifan,Lin Yuan
A novel two-phase method was employed to directly deposit PbS quantum dots (QDs) on nanocrystalline SnO 2 thin films. In the two-phase method, the nanocrystalline SnO 2 thin film with adsorption of Pb 2+ ions was placed in an aqueous solution, and S 2− ions were dissolved in an oil solution. As two solutions were contacted, S 2− ions prefer to transfer to the aqueous solution and diffuse to the thin film surface with the adsorbed Pb 2+ ions to homogeneously form monodispersed PbS QDs on the nanocrystalline thin film. The homogeneous monodispersed QDs-sensitized thin film was used as a photoelectrode to fabricate QDs-sensitized solar cell. The loaded amount of PbS QDs and the thickness of ZnS passivation layer were optimized to obtain the highest light-to-electric conversion efficiency of 1.01 % under the simulated AM 1.5 illumination, which is increased by 61 % compared with that of the PbS QDs-sensitized solar cell employing the successive ionic layer adsorption and reaction (SILAR). The solar cell with homogeneous sensitization of QDs generates a photocurrent density of 11.09 mA·cm −2 , which is 2.4 times higher than that of the unhomogeneous one prepared by SILAR. The conversion efficiency enhancement mechanism due to the two-phase method was discussed in detail through the measurements of intensity-modulated photovoltage spectrum and electrochemical impedance spectroscopy.
研究领域:
材料科学
·
光电化学
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产品关联
DOI
高影响因子
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