查找使用阿拉丁产品的科研文献

Above 10% efficient electrodeposited Cu2ZnSn(S,Se)4 solar cell achieved by modifying precursor

Xiatong Qin,Bin Xu,Jianjun Lin,Jiaqi Chen,Hanyu Tong,Ye Chen,Pingxiong Yang,Junhao Chu,Lin Sun

Electrodeposition is a promising method to fabricate Cu 2 ZnSn(S,Se) 4 (i.e., CZTSSe) absorber layer thanks to its many advantages such as low-cost and large-scale. However, the secondary phases and intrinsic defects in electrodeposited CZTSSe solar cells inevitably limit the photoelectric performance. Herein, two different kind of precursor films (binary-ternary selenide vs. quaternary selenide) are deliberately fabricated and the effect of these precursors on the secondary phases and intrinsic defects of CZTSSe absorber layer are investigated comprehensively. The absorber layer obtained from binary-ternary selenide precursor has a small amount of ZnSe secondary phases and Cu Sn deep defects , whereas that obtained from the quaternary selenide precursor exhibits the favorable V Cu shallow defects, which is beneficial to the efficiency improvement in CZTSSe. Based on the quaternary selenide precursor film, the CZTSSe solar cell with 10.03% total area efficiency (the active area efficiency is 10.9%) was obtained. This is the highest efficiency of CZTSSe solar cells prepared by the electrodeposition method.

Mechanistic insight into the bifurcated pH-dependent decontamination trends in zero-valent aluminum systems

Yang Liu,Xiaowen Zhang,Fashuai Yang,Cuili Xing,Peng Fan,Yuankui Sun,Xiaohong Guan

Zero-valent aluminum (ZVAl) shows promise for environmental remediation, yet its decontamination performance under circumneutral conditions remains debated. To unravel this paradox, we employed Se(IV) and nitrate (NO 3 − ) as model pollutants to probe how contaminant-specific modulation of Al 2 O 3 transformation dictates ZVAl performance across pH 0 2.0–11.0. Results revealed that Se(IV) sequestration exhibited U-shaped kinetics with minimum efficiency at pH 0 4.0–7.0 (5.8–14.2 %), whereas NO 3 − reduction displayed an inverted U-shaped trend with maximum efficiency (> 95 %) obtained in the same pH range. Mechanistic studies demonstrated that these contrasting trends originate from pollutant-mediated Al 2 O 3 evolution. Specifically, Lewis-basicity-dependent competition for Al 2 O 3 surface sites dictates whether hydration or dissolution dominates activation. Se(IV), acting as a strong Lewis base, inhibited Al 2 O 3 hydration by competing with OH − for Al 2 O 3 surface sites and/or forming passivating Al-O-SeO 3 2− complexes , thereby self-limiting its own removal. Conversely, NO 3 − with weak Lewis basicity negligibly affected Al 2 O 3 hydration to form porous Al(OH) 3 , which can enhance electron transfer by reducing interfacial charge transfer resistance. This work resolves the long-standing pH limitation paradox in ZVAl systems by elucidating the role of Al 2 O 3 evolution, thereby offering a mechanistic framework for the design of adaptive metal-based remediation technologies.

A novel polysaccharide isolated from mulberry fruits (Murus alba L.) and its selenide derivative: structural characterization and biological activities

Chun Chen,Bin Zhang,Xiong Fu,Rui Hai Liu

A novel polysaccharide (MFP3P) was isolated from Murus alba L. through the hot water extraction method followed by chromatographic purification. The chemical structure of MFP3P was elucidated by acid hydrolysis, Smith degradation and methylation analysis, along with FT-IR, GC-MS, 1H and 13C NMR spectroscopy. Its morphological properties were further characterized by SEM and AFM. The selenide of the polysaccharide (MFP3P-Se) was obtained by the Na2SeO3/BaCl2 method. The antioxidant properties showed that MFP3P-Se exhibited higher peroxy radical-scavenging capacity than MFP3P in vitro. Moreover, MFP3P-Se had more significant hypoglycemic effects than MFP3P through promoting pancreatic cell proliferation and increasing glucose metabolism and insulin secretion.

Viable Strategy for Suppressing Antisite Defects and Band Tailing States in Solution-Processed Kesterite Solar Cells via IIIA Incorporation: Case of Aluminum

Boyang Han,Yongfeng Li,Rensheng Wang,Wenjie Zhu,Zhenyan He,Huanhuan Sun,Xiuqing Meng,Shihua Huang,Yanping Song,Jiayong Zhang,Bin Yao

Suppressing the CuZn antisite defects and band tailing states is paramount for Cu2ZnSn(S,Se)4 (CZTSSe) solar cells. To this end, cation doping has been widely adopted and investigated. Nevertheless, to the best of our knowledge, there is a scarcity of reports specifically addressing the doping of group IIIA elements to date. Herein, we present a viable strategy, incorporating the Al element, to achieve superior absorber quality and device performance. The addition of Al-doping not only improves the selenization degree but also enhances surface smoothness and induces a more Cu-deficient CZTSSe surface, thereby elevating both the quality of the absorber and heterojunction interface. Furthermore, we observe that the CuZn defect can be effectively mitigated through the substitution of Al dopants at the Zn site, consequently resulting in a reduction of band tailing states. Consequently, it significantly improves the efficiency from 6.24 to 9.25% with a low open-circuit voltage deficit of ∼0.291 V relative to the doping-free case, one of the highest values for the type of IIIA element doping cells. Our results demonstrate that Al incorporation is also a feasible pathway to suppress the antisite defects and band tailing states in solution-processed CZTSSe, thereby facilitating the realization of efficient kesterite solar cells.

Comparative study on the effects of substitutional Ag and substitutional Ge on kesterite thin-film solar cells

Hu Jiaming,Han Xiuxun,Zhu Wuzhi,Wu Fangfang,Tan Xiaohui

Incorporating substitutional elements from groups I, II and IV is an important approach to improve the quality of kesterite thin films. Among the elements, Ag and Ge are most effective in promoting the performance of Cu 2 ZnSn(S,Se) 4 solar cells. Although several theoretical and experimental studies have been conducted on the Ag/Ge-alloyed kesterite, there are significant differences in the reported morphological characteristics, photovoltaic performance and even the optimal Ag/Ge substitution ratio due to different preparation processes utilized, which leads to difficulties in comparing the Ag-incorporated and Ge-incorporated kesterite solar cells. Currently, there is little literature on the comparative study concerned. Herein, we fabricated Ag-alloyed and Ge-alloyed kesterite solar cells based on the same solution method and process conditions, and laterally compared the effects of Ag substitution and Ge substitution on the phase compositions, morphologies, optical bandgaps, minority carrier lifetime and device performance of kesterite Cu 2 ZnSn(S,Se) 4 thin films.

Alcohol-Mediated Abandoned Silk Textile Transformation to Self-Support Carbon Frameworks Anchoring with CoSe for Bifunctional Electrocatalytic Water Splitting

Lanlan Yang,Taoyi Shen,Xiang Chen,Zhongce Hu,Dan Ge,Rui Zhang,Kaifu Zhang,Houyong Yu

Developing a self-supported structure with an enriched active site is crucial for enhancing the water splitting performance of transition metal selenide electrocatalysts. Herein, we present a cobalt selenide/waste silk-derived carbon (CoSe/SC) hybrid catalyst synthesized through a synergistic alcohol-mediated solvothermal and controlled pyrolysis strategy. Notably, the incorporation of ethanol transforms silk from a random coil to a highly crystalline β-sheet conformation, which effectively preserves the hierarchical architecture during carbonization. The resulting self-supporting SC matrix demonstrates exceptional electrical conductivity, enabling optimal dispersion and electronic coupling of the CoSe nanoparticles. Electrochemical evaluations reveal the optimized CoSe/SC-2 catalyst achieves overpotentials of 254.4 mV and 278.7 mV to drive 10 mA cm–2 for the HER and the OER, respectively. Importantly, the formation of Se–C bonds endows a strong coupling between cobalt selenide and waste silk-derived carbon, leading to enhanced stability (130 h) of CoSe/SC-2 in overall water splitting. This work offers valuable insights for designing transition metal selenides supported on regenerated biomass to achieve efficient electrocatalytic water splitting.

MoO2 Sacrificial Layer for Optimizing Back Contact Interface of Cu2ZnSn(S,Se)4 Solar Cells

Bin Xu,Xiaoshuang Lu,Chuanhe Ma,Yulin Liu,Ruijuan Qi,Rong Huang,Ye Chen,Pingxiong Yang,Junhao Chu,Lin Sun

Bi₂Se₃@BiSe heterostructures for triple-modal anticancer therapy: Integrating photothermal, photodynamic, and immunotherapeutic approaches

Shouning Yang,Ran Guo,Shuai Zhang,Fangxiao Li,Jinliang Liu,Huayan Yang

The integration of photothermal therapy (PTT), photodynamic therapy (PDT), and immunotherapy represents a promising strategy for enhancing anticancer efficacy. However, current approaches often rely on cocktail-based nanoplatforms that load multiple agents, which complicates preparation and raises concerns about stability and potential side effects. Therefore, developing structurally simple, easily synthesized nanomaterials with inherent multifunctionality is highly desirable. In this work, we report the first synthesis of biocompatible heterostructures. The interfacial contact within these heterostructures facilitates efficient charge carrier separation, enabling the simultaneous activation of photothermal conversion and photodynamic functionalities under near-infrared (NIR) irradiation. Beyond these photophysical effects, the obtained Bi₂Se₃@BiSe nanosheets effectively polarize M0 macrophages toward the tumor-suppressive M1 phenotype, a process which in turn promotes robust immunogenic cell death. Collectively, this work establishes Bi₂Se₃@BiSe as a versatile nanoplatform for triple-modal cancer therapy, seamlessly integrating PTT, PDT, and immunotherapy, thus proposing a novel paradigm for developing next-generation combinatory cancer therapeutics.

Efficient and stable TiO2/Sb2S3 planar solar cells from absorber crystallization and Se-atmosphere annealing

Hui Deng,Shengjie Yuan,Xiaokun Yang,Fensha Cai,Chao Hu,Keke Qiao,Jian Zhang,Jiang Tang,Haisheng Song,Zhubing He

Inorganic Sb 2 S 3 thin film solar cells show wide application prospects in low cost, non-toxicity and high stability solar cells comparing with well-developed CIGS , CdTe and organohalide perovskite materials. The present work successfully fabricated Sb 2 S 3 film utilizing rapid thermal evaporation (RTE) method. By optimizing the crystal growth technique, smooth and non-pinhole Sb 2 S 3 film was deposited on compact TiO 2 substrate. The corresponding planar TiO 2 /Sb 2 S 3 solar cells without hole transport material (HTM) assistance achieved an efficiency of 2.5%. To eliminate S-shape J-V curves and improve the fill factor, the as-deposited Sb 2 S 3 film was further annealed in selenium atmosphere. The efficiency and fill factor of Se-atmosphere annealed Sb 2 S 3 devices were improved to 3.2% and 55%, respectively. The device improvement mechanism of Se-annealing process were systematically illustrated by cryogenic measurements, impedance analysis and capacitance-voltage characterizations. The post-annealing could help to improve junction quality, passivate absorber defects and decrease back contact barrier. The Se-atmosphere annealed Sb 2 S 3 devices could stand continuous one sun illumination for 400 h and the efficiency was almost the same. After storing in air for six months, the average efficiencies still hold more than 90% of initial value . The present developed environment-friendly stable devices and efficient treatment technique were expected to enrich the research of thin film solar cell.

Over 7% Efficiency of Sb2(S,Se)3 Solar Cells via V-Shaped Bandgap Engineering

Kanghua Li,Yue Lu,Xiaoxing Ke,Sen Li,Shuaicheng Lu,Chong Wang,Siyu Wang,Chao Chen,Jiang Tang

Antimony chalcogenides (including Sb 2 S 3 , Sb 2 Se 3 , and Sb 2 (S,Se) 3 alloy) have emerged as promising solar absorber materials. Notably, the Sb 2 (S,Se) 3 alloy possesses continuously tunable bandgap from 1.1 to 1.7 eV, which covers the ideal bandgap for single-junction photovoltaics governed by the Shockley–Queisser theory. Moreover, the bandgap gradient provides effective ways for photogenerated carriers collection and has the potential for high-efficient Sb 2 (S,Se) 3 alloy solar cells. Herein, a V-shaped distributional bandgap in Sb 2 (S,Se) 3 solar cells is reported through a simple dual-source vapor transport deposition process, enabling the synergetic increase of the open-circuit voltage ( V OC ) and short-circuit current ( J SC ). Through careful optimization, a power conversion efficiency of 7.27% under AM1.5G illumination is obtained, with V OC and J SC of 0.46 V and 29.6 mA cm −2 , respectively. This V-shaped bandgap engineering provides an effective method to enhance the device performance and can be extended to other chalcogenide thin-film solar cells such as Sn–X, Ge–X, Cu–Sb–X (X = S and Se), and so on.

Bi2O(XO4)(IO3)2 (X = S, Se, Cr): Three-dimensional frameworks containing [Bi4O2]8+ clusters

Long Shi,Dajiang Mei,Jingli Xu,Yuandong Wu

Three new bismuth-based compounds, Bi 2 O(XO 4 )(IO 3 ) 2 (X = S, Se, Cr) have been synthesized by hydrothermal method and characterized by single-crystal X-ray diffraction. Title compounds crystallize in the monoclinic space group P 2 1 /n (No.14) with lattice parameters: a  = 7.2391(5), b  = 17.9074(12), c  = 7.7964(5) Å, β  = 109.6521(15) °, Z = 4 for Bi 2 O(SO 4 )(IO 3 ) 2 ; a  = 7.2665(4), b  = 18.0115(10), c  = 7.9310(5) Å, β  = 109.7480(10) °, Z = 4 for Bi 2 O(SeO 4 )(IO 3 ) 2 ; and a  = 7.2708(6), b  = 17.9967(14), c  = 7.8998(6) Å, β  = 109.799(2) °, Z = 4 for Bi 2 O(CrO 4 )(IO 3 ) 2 , respectively. All compounds exhibit three-dimensional frameworks that are composed of [Bi 4 O 2 ] 8+ clusters, [IO 3 ] − and [XO 4 ] 2− (X = S, Se, Cr) groups. Bi atoms occur in two different coordination types, showing the stereochemical influence of the Bi 3+ lone electron pair. Title compounds were characterized by infrared spectra, solid state UV–vis–NIR diffuse reflectance spectroscopy and thermogravimetric analysis.

Altering the high-temperature stability and thermoelectric properties of Cu1.8S thermoelectric materials by Se incorporation

Siqi Xiang,Yihan Liang,Mengcheng Zhou,Xinfang Zhang

Thermoelectric materials based on Cu 1.8 S are not hampered by electric-field-driven degradation in real applications, but their high-temperature applications are problematic owing to their tendency to oxidize or spontaneously decompose. Here, we reveal that Cu 1.8 S powder is gradually oxidized to form a mixture of Cu 2 O, Cu(SO 4 ), and Cu 2 O(SO 4 ) at high temperatures under air. Although a dense oxide film is formed on the surface of the sintered Cu 1.8 S block at high temperature, hindering the oxidation process , the brittle oxide film fails to inhibit the spontaneous decomposition of the Cu 1.8 S block into the Cu 1.96 S phase and S vapor at high temperatures. Thus, Cu 1.8 S thermoelectric materials are unsuitable for applications above 300 °C in air. To address this issue, we partially replaced S atoms with Se; the sintered Cu 1.8 S 0.8 Se 0.2 blocks exhibited significantly increased anti-oxidation and anti-decomposition capacities in air. In addition, we found that the thermoelectric figure of merit of the sintered Cu 1.8 S 0.8 Se 0.2 block was 47% higher than that of traditionally prepared, pure Cu 1.8 S at 450 °C.