Journal of the American Chemical Society
·
2013
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IF 10.677
Yu Zou,Xiong Su,Jiang Jiang
Cu2ZnSnS4 (CZTS) nanocrystals with different morphologies and phases have been synthesized in hot organic solvents such as dodecanethiol and oleylamine. The crystallographic phases could be controlled by the sulfur precursor and the ligand species of the metal salts used for the synthesis. When a highly reactive sulfur precursor and metal acetates were used, wurtzite CZTS nanocrystals were obtained. On the other hand, using a low-reactivity sulfur precursor or metal chlorides produced CZTS nanocrystals in a kesterite phase. The experimental results from systematic investigations indicated that the reaction rate between Zn and S precursors played a determining role for the growth of CZTS nanocrystals with different crystalline phases. A relatively faster reaction between Zn and S precursors in comparison to the Sn–S reaction favored the formation of a metastable wurtzite phase, which could be accelerated by increasing the reactivity of the S precursor. This work provided a safe and economical way to synthesize high-quality phase-controlled Cu2ZnSnS4 nanocrystals, especially wurtzite nanorods, for potential photovoltaic applications. Moreover, preliminary results show that the proposed mechanism also applies to the phase-controlled synthesis of other quaternary Cu2MSnS4 (M = Cd2+, Mn2+) nanocrystals.
研究领域:
材料科学
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化学工程
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纳米技术
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DOI
PubMed
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 11
·1520
·
IF 4.034
Lei Qiu,Jiaxiong Xu,Xiao Tian
Ag and Mn dopants were incorporated into Cu2ZnSnS4thin film to reduce defects in thin film and improve thin film properties. Sol–gel and spin-coating techniques were employed to deposit Ag and Mn co-doped Cu2ZnSnS4thin films. The structures, compositions, morphologies, and optical properties of the co-doped thin films were characterized. The experimental results indicate the formation of kesterite structure without Ag and Mn secondary phases. The amount of Ag in the thin films is close to that in the sols. The co-doped Cu2ZnSnS4thin films have an absorption coefficient of larger than 1.3 × 104cm−1, a direct optical band gap of 1.54–2.14 eV, and enhanced photoluminescence. The nonradiative recombination in Cu2ZnSnS4thin film is reduced by Ag and Mn co-doping. The experimental results show that Ag and Mn incorporation can improve the properties of Cu2ZnSnS4thin film.Keywords:Cu2ZnSnS4;Ag and Mn co-doping;thin films;sol–gel preparation
研究领域:
材料科学
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半导体物理
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光电
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DOI
PubMed
高影响因子
Nanoscale
·
2013
·Vol. 5
·期 17
·8114-8121
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IF 6.233
Wei Zhang,Lanlan Zhai,Na He,Chao Zou,Xiaozhen Geng,Lujun Cheng,Youqing Dong,Shaoming Huang
Cu2ZnSnS4 is a promising solar absorbing material in solar cells due to its high absorption coefficient and abundance on earth. We have demonstrated that wurtzite Cu2ZnSnS4 nanoleaves could be synthesized through a facile solution-based method. Detailed investigation of the growth process indicates that α-Cu2S nanocrystals are first formed and then serve as a catalyst to introduce the Cu, Zn, and Sn species into the nanoleaf growth for fast ionic conduction. The structure of the as-synthesized nanoleaves is characterized by powder X-ray diffraction, high-resolution transmission electron microscopy, fast Fourier transform, and energy dispersive X-ray spectroscopy mapping. Photoresponses of Cu2ZnSnS4 nanoleaves are evaluated by I–V curves of a Cu2ZnSnS4 nanoleaf film. It is believed that the enhancement of the photoresponse current of the Cu2ZnSnS4 nanoleaf film can be attributed to fast carrier transport due to the single crystalline nature and enhanced light absorption resulting from larger absorption areas of the Cu2ZnSnS4 nanoleaves.
研究领域:
材料科学
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太阳能电池研究
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Chao-Qian Liu,Bin Wen,Nan Wang,Shi-Min Liu,Hua-Lin Wang,Wei-Wei Jiang,Wan-Yu Ding,Shi-Chong Xu,Wei-Ping Chai
The mechanochemical process was employed to synthesize Cu 2 ZnSnS 4 (CZTS) powder using elemental powders of Cu, Zn, Sn and S as the source materials. The phase evolution of the synthesized powders dependent on the milling parameters was systematically researched according to Raman and X-ray diffraction measurements . It is noteworthy that the kesterite CZTS phase were observed in the mechanochemical process milling only for 3 h, but some binary metal sulfides always existed in the synthesized powders. Moreover, the formation mechanism of the CZTS phase in the mechanochemical processes was proposed. Further, the sintering behaviors of the synthesized powders were systematically investigated also, i.e., the effects of sintering temperature and milling parameters were discussed on the phase, residual stress, composition, cross-section morphologies and relative densities. It was found that the longer the milling time and/or the higher the milling rotation speed, the better the sintering properties of the synthesized powders.
研究领域:
材料科学
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无机化学
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2019
·Vol. 49
·期 3
·1819-1826
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IF 1.676
Gu Kang,Hao Ruiting,Guo Jie,Aierken Abuduwayiti,Liu Xinxing,Chang Faran,Li Yong,Wei Guoshuai,Liu Bin,Wang Lu,Sun Shuaihui,Ma Xiaole
In this work, the (Ag,Cu) 2 ZnSnS 4 (ACZTS) thin films were fabricated via sputtering with a multi-target to form different layer stacks, i.e., (S1) ZnS/Sn/Cu/Ag/Mo,(S2) ZnS/Sn/Ag/Cu/Mo and (S3) ZnS/Ag/Sn/Cu/Mo. The stacked precursors were sulfurized through a soft annealing, followed by a two-step sulfurization in a chamber filled with N 2 at standard atmospheric pressure. The x-ray photoelectron spectroscopy elemental profile showed a vertical non-uniform distribution of Ag in the film. Based on the results of scanning electron microscopy and electron probe microanalysis, Ag enrichment of the upper surface was beneficial for the grain size. Moreover, a dense, uniform surface could be obtained and the stability of the elemental composition could be maintained. After optimizing the order of the Ag layers, the efficiency of the solar cells increased from 1.30% to 3.65%, an improvement of 181%. The open circuit voltage is increased from 448 mV to 630 mV because of the reduced voids, increased grain size, and reduced Cu Zn antisite defects.
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
高影响因子
Inorganic Chemistry Frontiers
·
2024
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IF 6.1
Lunyao Pan,Wen Li,Xiankan Zeng,Maolin Mu,Qungui Wang,Yongjian Chen,Chenglong Li,Shiyu Yang,Linzhu Dai,Li Tao,Weiqing Yang
Inorganic Cu2ZnSnS4 (CZTS) has garnered significant attention in the field of solar cells owing to its high hole mobility, suitable optical bandgap, cost-effective and earth-abundant elemental constituents. In particular, the deeper highest occupied molecular orbital (HOMO) of CZTS makes it an alternative for the traditional organic hole transport layer (HTL) material poly(3,4-ethyllenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), which can suppress acidic interface and hygroscopic problem in perovskite light-emitting diodes (PeLEDs). Herein, we demonstrate CZTS as a novel inorganic HTL for green FAPbBr3 PeLEDs, achieving a peak external quantum efficiency (EQE) of 7.59% and a maximum luminance of 27 000 cd m−2 (emitting at 529 nm). The fluorescence properties of the perovskite films and interfacial behaviors of CZTS/FAPbBr3 were investigated through surface state regulation of CZTS HTL. High hole mobility (0–30 cm2 V−1 s−1) of CZTS HTL and low hole injection barrier (∼0.13 eV) between CZTS and perovskite endow the CZTS-based PeLEDs with enhanced hole transport capability and suppressed interfacial carrier accumulation. In addition, an attractive cost-effectiveness advantage of about $0.24 per g synthesizing CZTS makes it a promising competitor to mainstream organic HTL materials such as PEDOT:PSS (∼$1.3 per g). An in-depth understanding of this novel CZTS HTL makes an essential step forward for the commercialization of PeLEDs.
研究领域:
材料科学
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光电学
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半导体物理
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产品关联
DOI
高影响因子
Crystals
·
2024
·Vol. 14
·期 10
·910
·
IF 2.4
Meihong Huang,Junhui Lin,Zhiyong Liang,Shaowei Chen,Yuling Zhong,Feng Wang,Bixian Chen,Dongxia Zhang
The addition of flexible Cu2ZnSnS4 (CZTS) thin film solar cells to titanium (Ti) substrates is an attractive way to achieve the low-cost manufacturing of photovoltaics. Prior research has indicated that the appropriate diffusion of Ti elements can enhance the crystalline growth of CZTS films. However, the excessive diffusion of Ti has been shown to adversely affect the photovoltaic performance of CZTS photovoltaic devices. Therefore, it is essential to regulate the diffusion of Ti elements within CZTS thin films to optimize their photovoltaic properties. The tendency for Ti substrate elements to diffuse into CZTS films is also influenced by the activation energy associated with these Ti elements. The sulfurization temperature is posited to be a critical factor in modulating the diffusion and activation energy of Ti elements within CZTS thin films. Consequently, this research investigates the alteration of the sulfurization temperature of CZTS thin films in order to enhance the properties of these thin films and to examine the diffusion behavior of titanium elements. The results reveal that as the sulfurization temperature increases, the diffusion of Ti elements within the CZTS thin films initially increases, then decreases, and subsequently increases again. This pattern suggests that the diffusion of Ti elements is affected not only by the activation energy of the Ti elements but also by the defect hopping distance within the CZTS thin films. Notably, at a sulfurization temperature of 550 °C, the grains at the base of the CZTS thin film demonstrate an increased density, which is associated with a reduced defect hopping distance, thereby hindering the diffusion of Ti elements within the CZTS thin films. Furthermore, at this specific sulfurization temperature, the slope of the current–voltage (I–V) curve for the CZTS/Ti structure reaches its maximum, indicating optimal ohmic contact characteristics.
研究领域:
材料科学
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太阳能技术
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2017
·Vol. 164
·期 13
·H863
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IF 3.259
Xingzhi Wang,Zhuang Wang,Xishun Jiang,Miao Zhang,Yanfen Wang,Jianguo Lv,Gang He,Zhaoqi Sun
Highly ordered TiO2 nanorod (TNR) arrays decorated with Cu2ZnSnS4 (CZTS) nanocrystals were prepared via a facile and effective method. The TNR arrays were synthesized using a hydrothermal treatment, and the CZTS nanocrystals were deposited by a three-step successive ionic layer adsorption and reaction (SILAR) technique followed by annealing in a sulfur atmosphere. The morphology, structure, composition, optical, and the photoelectrochemical (PEC) properties of the CZTS/TNR arrays were investigated in detail. The results demonstrate that the CZTS/TNR arrays can effectively facilitate photoinduced carrier transport, reduce the recombination rate of electron-hole pairs, and as a result demonstrate improved light absorption properties and PEC performance. The CZTS/TNR arrays sensitized with 7 SILAR cycles showed a maximal photocurrent density of 2.17 mA/cm2 at 0 V and the longest electron lifetime of 47.39 ms, which is nearly 80 and 2.03 times higher than those of pure TNR, respectively. The improvement in performance can be attributed to the high absorption coefficient and narrow bandgap of CZTS and the type-II nanoheterostructures with a staggered alignment of band edges present at the heterointerface. Surface passivation with ZnS resulted in a further improvement in PEC performance in comparison to the untreated CZTS/TNR arrays with values of 2.53 mA/cm2 and 59.77 ms for the maximal photocurrent density and longest electron lifetime, respectively.
研究领域:
材料科学
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纳米技术
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光电化学
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 110
·90217-90225
·
IF 3.84
Xun Zhou,Weili Meng,Chao Dong,Changwen Liu,Zeliang Qiu,Juanjuan Qi,Junwei Chen,Mingtai Wang
High-purity Cu2ZnSnS4 quantum dots (CZTS-QDs) with a size of 3–5 nm and a band gap of 1.67 eV are synthesized by a facile solvothermal method using simple chemicals in ethanol solvent. The CZTS-QDs have an ionization potential (IP) of −5.96 eV and an electron affinity (EA) of −4.33 eV, which are almost not changed after removal of capping molecules on them. Due to the favorable IP and EA positions with respect to those of poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV), the CZTS-QDs act as effective electron acceptors for hybrid solar cells based on polymer/CZTS blends with MEH-PPV as the polymer. CZTS-QDs and MEH-PPV form type-II heterojunctions to enable the solar cells to have a promising open-circuit voltage of 0.63 V, and the efficient charge separation for neutral excited states produced either on the polymer or on the CZTS-QDs makes the solar cells have a wide spectral response extending to 900 nm. It is revealed that removal of capping molecules on the quantum dots mainly leads to a reduced polymer exciton diffusion effect on the electron transport dynamics due to the formation of wider CZTS charge transport channels and an increased short-circuit current (Jsc) in the solar cells, where the enhanced Jsc dominantly correlates with the increased charge transfer and collection efficiencies due to the improved charge transport property in CZTS channels.
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
高影响因子
JOURNAL OF MATERIALS RESEARCH
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2022
·Vol. 37
·期 11
·1835-1844
·
IF 2.909
Yang Meng,Zhou Guangyan,Wei Yajuan,Huang Zhengguo,Zhang Jingbo
The catalytic activity of quaternary Cu 2 ZnSnS 4 (CZTS) as counter electrode (CE) of dye-sensitized solar cells (DSSCs) was enhanced by covering Co 9 S 8 on CZTS thin film prepared by the spin-coating method. The effect of the repeating number of spin coating process on morphologies and catalytic properties of CZTS thin films was investigated. When the repeating number of spin coating processes is 3, the CZTS thin film thickness is moderate and the formed nanoparticles are tightly bound. The conversion efficiency of DSSC based on the CZTS thin film CE prepared by 3 spin coating cycles reaches 4.79%. By forming a CZTS/Co 9 S 8 composite electrode via vulcanizing the deposited ZIF-67, the highest photoelectric conversion efficiency of DSSC based on the optimized composite CE further reaches 6.41%. The higher photoelectric conversion efficiency is attributed to the good interfacial transferring of electrons and redox properties for electrolyte of the composite CE. Graphical abstract
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
Electrocatalysis
·
2023
·
IF 3.1
Hu Xuemei,Zhou Jianping,Bao Jianqin,Zhang Yadong,Qiao Junqiang
In this work, hierarchical Cu 2 ZnSnS 4 electrocatalysts with different morphologies and stoichiometries were synthesized via the hydrothermal method and their electrocatalytic performances in hydrogen evolution reaction were evaluated. The morphologies of Cu 2 ZnSnS 4 electrocatalysts were modulated by adjusting the content of surfactants during the hydrothermal process. The stoichiometries of as-prepared Cu 2 ZnSnS 4 were found to be Cu 2 Zn 0.8 Sn 0.7 S 2.9 , Cu 2 Zn 0.7 Sn 1.2 S 4.7 and Cu 2 Zn 0.5 Sn 0.7 S 3.2 for the absence of surfactant and the addition of polyethylene glycol-(400) (PEG 400) and octylphenol polyoxyethyleneether-10 (OP 10) respectively. The Cu 2 ZnSnS 4 synthesized with the addition of PEG 400 displayed superior electrocatalytic activity in acid medium with an overpotential of 295 mV obtained at 10 mA cm − 2 and a Tafel slope of 133 mV dec − 1 . This work reveals that the stoichiometry and microstructure of Cu 2 ZnSnS 4 are critically important for its electrocatalytic activity while have less impact on the electrocatalytic durability, and provides useful information to explore the utilization of chalcogenides as the attractive electrocatalysts.
研究领域:
材料科学
·
电催化
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Li Guo,Kailai Zhang,Xuanxuan Han,Qiang Zhao,Yuanyuan Zhang,Mian Qi,Danjun Wang,Feng Fu
In this work, a set of novel Cu 2 ZnSnS 4 /Bi 2 WO 6 (CZTS/BWO) two-dimensional (2D)/two-dimensional (2D) type-II heterojunctions with different CZTS weight ratios (1%, 2%, and 5%) were successfully synthesized via a brief secondary solvothermal process. The successful formation of the heterojunctions was affirmed by characterization methods such as X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy. The photocatalytic activity results showed that the prepared CZTS/BWO heterojunctions had excellent photocatalytic behaviors for organic degradation, especially when the mass fraction of CZTS with respect to BWO in the composite was 2%. Moreover, the addition of hydrogen peroxide (H 2 O 2 ) could further improve the dye and antibiotic degradation efficiencies. The reinforced photocatalytic and photo-Fenton degradation performance were primarily attributable to the introduction of BWO, which afforded increased active sites, expanded the solar spectral response range, and accelerated the cycle of Cu(II)/Cu(I); after four cycling times, its catalytic activity did not decrease significantly. In addition, reasonable hypotheses of the photocatalytic and photo-Fenton catalytic mechanisms were formulated. This study is expected to provide a visual approach for designing a novel photo-Fenton catalyst to jointly utilize the photocatalytic and Fenton activities, which can be better applied to the purification of residual organics in wastewater.
研究领域:
材料科学
·
环境科学
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化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）