ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Lijian Huang,Song Wei,Daocheng Pan
Large-grained Cu2ZnSn(S,Se)4 (CZTSSe) absorber layers are highly desirable for high-performance CZTSSe thin film solar cells. However, solution-deposited CZTSSe thin films usually consist of a large-grained top layer and a smaller-grained bottom layer. In this work, we adopt a phase-separation strategy to promote the crystal growth of the CZTSSe thin film. By choosing ZnCl2, SnCl2, CuCl (instead of CuCl2), and thiourea as the starting materials, a Cu2S/SnS/ZnS hybrid precursor thin film can be prepared, the composition of which has been testified by X-ray diffraction, X-ray photoelectron spectroscopy, Raman, and scanning electron microscopy-energy-dispersive spectrometry characterization. Owing to the volume expansion caused by Se incorporation and the high migration abilities of Cu(I) and Sn(II) ions during selenization, large-grained and compact CZTSSe films with a thickness up to 5 μm can be obtained. The corresponding thin film solar cell devices have achieved active power conversion efficiencies above 10% (8.78% for total area), much higher than those of CuCl2-based CZTSSe devices in our lab.
研究领域:
材料科学
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能源科学
·
薄膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhenliang Yang,Bingqing Li,Jingkun Xu,Yi Zhong,Liang Xie,Mingfu Chu,Yun Wang,Rui Gao,Libing Yu,Mingshan Wang,Guoliang Zhao,Pengcheng Zhang,Bin Bai,Chen Xu
Two strategies have been extensively employed to develop advanced accident tolerant fuels (ATF): improving thermal conductivity and producing large grain sized pellets. However, there are few reports on the simultaneous utilization of both strategies. In this work, we fabricated Mo–Cr alloy reinforced UO 2 (UMC) composite pellet with both high thermal conductivity and large grain size by a simple in-situ alloying method for the first time. The average grain size of UO 2 increased from 6 μm to 113 μm. Thermal conductivity of the UMC pellet (with 2 vol% Mo) at 1200 °C increased by 36.46% compared with pure UO 2 . The increase rate of thermal conductivity per 1 vol% dopant reached about 18%. The Mo–Cr alloy formed continuous micro-cell layer around UO 2 particles. Such continuous micro-cell Mo–Cr alloy layer and increase of UO 2 grain size both helped improve the thermal conductivity of UMC composite pellets. Thermal expansion coefficient of the UMC under the operating temperature decreased by 11.90% compared with pure UO 2 . The oxidation resistance of the UMC pellet under high temperature steam was also improved. This work provides a new strategy towards fabricating ATF with both high thermal conductivity and large grain size.
研究领域:
核能工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 20
·2201241
·
IF 17.521
Yubo Cui,Mengyang Wang,Peizhe Dong,Shuangshuang Zhang,Junjie Fu,Libo Fan,Chaoliang Zhao,Sixin Wu,Zhi Zheng
A main concern of the promising DMF-based Cu 2 ZnSn(S x ,Se 1- x ) 4 (CZTSSe) solar cells lies in the absence of a large-grain spanning structure, which is a key factor for high open-circuit voltage ( V oc ) and power conversion efficiency (PCE). A new strategy to achieve CZTSSe large-grain spanning monolayer is proposed, by taking advantage of the synergistic optimization with a Cu 2+ plus Sn 2+ redox system and pre-annealing temperatures. A series of structural, morphological, electrical, and photoelectric characterizations are employed to study the effects of the pre-annealing temperatures on absorber qualities, and an optimized temperature of 430 ℃ is determined. The growth mechanism of the large-grain spanning monolayer and the effect of redox reaction rate are carefully investigated. Three types of absorber growth mechanisms and a concept of critical temperature are proposed. The devices based on this large-grain spanning monolayer suppress the recombination of carriers at crystal boundaries and interfaces. The champion device exhibits a high V oc (>500 mV) and PCE of 11.76%, which are both the maximum values among DMF-based solar cells at the current stage.
研究领域:
材料科学
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太阳能电池研究
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 43
·期 8
·6257-6262
·
IF 2.986
Zhongdong Zhao,Yihan Qi,Qiuying Chen,Xuerong Zheng,Qiuyan Hao,Wen Zhang,Jing Mao,Caichi Liu,Hui Liu
Compared with the expensive and complicated vacuum techniques, the solution-based process to deposit I-III-VI 2 chalcogenide thin films (I=Cu, III=In or Ga, VI=S or Se) has attracted great interests due to its lower cost, higher scalable production and better application in flexible substrate . Herein, a low-toxic and high-active mixture solvent comprised of 1, 2-ethanedithiol and 1,2-ethylenediamine is utilized to dissolve elemental Cu, In and S powders at 60 °C, forming the CuInS 2 (CIS) precursor solution . After spin coating and annealing in a both Ar gas and selenium atmosphere, a dense and large-grained chalcopyrite CuIn(S,Se) 2 (CISSe) thin films with a close-packed grain size of ~800 nm are prepared, eliminating a undesired fine fine-grained bottom layer. In addition, the selenization temperature of the CISSe thin films is also discussed, which influences the phase composition, crystallinity and morphology of CISSe thin films. Photovoltaic device of the CISSe-based thin films is fabricated, obtaining a power conversion efficiency of 6.2% with an active cell area of 0.5 cm 2 under AM 1.5 illumination.
研究领域:
材料科学
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薄膜制备
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光伏器件
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无机功能材料
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半导体材料
✓ 已验证
DOI
高影响因子
ACS Photonics
·
2025
·
IF 6.7
Weidong Song,Junxing Lv,Jiaquan Li,Xiaopeng Huang,Huimin Duan,Hainan Qin,Sheng Ma,Jun Wei,Xin He,Ziqing Li
Large-grained perovskite films are critical for mitigating carrier recombination and ensuring device robustness. Here, we report a microgap thermal sublimation (MGTS) method for fabricating high-quality, large-grained CsCu2I3 films designed for air-stable UV photodetection. By engineering a submillimeter sublimation zone under low-vacuum conditions, our approach enables self-regulated deposition that yields densely packed, highly crystalline films with preferential (221) orientation on both crystalline GaN and amorphous glass substrates. Kinetic gas theory analysis suggests that our microgap configuration maintains a vapor collision probability below 40%, facilitating efficient precursor transport and uniform film growth with grain sizes exceeding 20 μm. The resulting CsCu2I3/GaN heterojunction UV photodetectors, operating in self-powered mode, achieve a responsivity of 106.34 mA/W, a detectivity of 9.24 × 1011 Jones, and rise/fall times of 4.12 μs/2.12 ms. Notably, the devices demonstrate picowatt-level detection limits and imaging capability. This work establishes MGTS as a scalable, cost-effective platform for developing air-stable, wide-bandgap copper halide perovskites for next-generation UV optoelectronics.
研究领域:
光电子学
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材料科学
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半导体器件
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薄膜技术
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光子学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Peng Dai,Wenyun Su,Zhaokun Xian,Xiangfu Wei,Shengchang Tang,Guangyong Huang,Cuimin Sun,Wei Han,Ling Zhu,Hui You
Developing a rapid fabrication method for crack-free opal films is a significant challenge with broad applications. We developed a microfluidic platform known as the “filter paper-enhanced evaporation microfluidic chip” (FPEE-chip) for the fabrication of photonic crystal and inverse opal hydrogel (IOPH) films. The chip featured a thin channel formed by bonding double-sided adhesive poly(ethylene terephthalate) with a polymethyl methacrylate cover and a glass substrate. This channel was then filled with nanosphere colloids. The water was guided to evaporate rapidly at the surface of the filter paper, allowing the nanospheres to self-assemble and accumulate within the channel under capillary forces. Experimental results confirmed that the self-assembly method based on the FPEE-chip was a rapid platform for producing high-quality opal, with centimeter-sized opal films achievable in less than an hour. Furthermore, the filter paper altered the stress release mechanism of the opal films during drying, resulting in fewer cracks. This platform was proven capable of producing large-grain, crack-free opal films of up to 30 mm2 in size. We also fabricated crack-free IOPH pH sensors that exhibited color and size responsiveness to pH changes. The coefficient of variation of the gray color distribution for crack-free IOPH ranged from 0.03 to 0.07, which was lower than that of cracked IOPH (ranging from 0.07 to 0.14). Additionally, the grayscale peak value in 1 mm2 of the crack-free IOPH was more than twice that of the cracked IOPH at the same pH. The FPEE-chip demonstrated potential as a candidate for developing vision sensors.
研究领域:
材料科学
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纳米技术
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传感器
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微流控
·
光子学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Ranyun Wu,Jianjian Yao,Siliang Wang,Xiaowen Zhou,Qiang Wang,Liang Gao,Weisheng Ding,Xin Dang,Wei Zeng
Planar perovskite solar cells (PSCs) have exhibited a promising alternative for high efficiency recently because of a new record of certified power conversion efficiency (PCE) of 21.5%. At the present stage of PSCs, achieving further improvements for long-term stability and efficiency are the key issues. It is necessary to fabricate PSCs with good interface and film crystallinity. Here, planar PSCs are fabricated by a synergistic effect of dimethyl sulfoxide additive and a dropwise addition method in a two-step deposition method. Under the optimizing procedure, a large-grain perovskite film with well-packed flat crystals is induced with a largest grain size of about 5 μm, which reveals decreased defect states owing to reduced grain boundaries. Moreover, the film has a highly compact and flat surface, leading to high crystallinity, enhanced light absorption, and low carrier recombination rates. Corresponding PCE is significantly promoted to 20.63% from the original 16.02%. More importantly, the PSCs even without encapsulation exhibit excellent humidity stability, retaining 93% of its initial efficiency after 500 h in air with 40% humidity, whereas the pristine devices degrade by approximately 65% after only surviving for 256 h. Therefore, the result provides a promising route for preparation of large-grain perovskite films and high-performance and stable PSCs.
研究领域:
材料科学
·
太阳能
·
光伏技术
✓ 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）