NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 20
·9243-9250
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IF 3.591
Rufeng Wang,Haiming Zhang,Siqi Han,Yizhi Wu,Zhanning Hu,Guixiang Zhang,Haoxuan Liu,Qingchen He,Xianjing Zhang
The all-inorganic perovskite CsPbIBr2 is a promising material in the photovoltaic (PV) field due to its acceptable optical bandgap and favorable air-stable phase stability. However, the conventional solution-processed poor-coverage thin films make it a challenging task to prepare high-performance solar cells. In this work, we introduce cadmium ions (Cd2+) into CsPbIBr2 perovskite and investigate how this doping treatment would affect the PV performance of the carbon-based CsPbIBr2 all-inorganic perovskite solar cells (FTO/SnO2/CsPbIBr2/carbon). We found that the crystallinity and morphology of CsPbIBr2 thin films are significantly improved after Cd2+ doping, leading to improved light absorption and carrier transportation with reduced carrier recombination in perovskites. The optimized device achieved the highest efficiency of 6.79% in comparison with 4.36% for the device without Cd2+ doping, an increase of 56% in efficiency. Meanwhile, the optimized device with Cd2+ doping exhibited enhanced stability (76% of initial efficiency after 10 hours) in ambient atmosphere. Furthermore, the whole fabrication process of these devices is performed at low temperatures, not more than 160 °C. The present work provides a simple and economical strategy for the fabrication of low-temperature-processed CsPbIBr2 solar cells and the improvement in their performance.
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
CHINESE JOURNAL OF CHEMISTRY
·
2017
·Vol. 35
·期 5
·567-571
·
IF 1.852
Man-bo Li,Shi-kai Tian,Zhikun Wu
Tuning the nanoclusters’ compositions and structures is critical for the performance improvement of nanoclusters. Herein, a well-known Au 25 (SCH 2 CH 2 Ph) 18 (Au 25 for short) nanocluster has been transformed to a rare cadmium doped gold nanocluster [Au 13 Cd 2 (PPh 3 ) 6 (SC 2 H 4 Ph) 6 (NO 3 ) 2 ] 2 Cd(NO 3 ) 4 (Au 26 Cd 5 for short) by peeling and doping. Although Au 25 exhibits no catalytic activity toward A 3 -coupling reaction under the investigated conditions, the novel cadmium doped gold nanocluster Au 26 Cd 5 shows high catalytic activity, as well as good recyclability and substrate tolerance for the same reaction. The high catalytic activity is attributed to the cooperation between the exerted cadmium atoms and the neighbor gold atoms on the surface of Au 13 icosahedron. This work has important implication for the tuning of nanoclusters’ compositions and structures targeting the improvement of catalytic performance by some unusual but effective strategies.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Fan Wu,He Ma,Xin Ye,Shaoyang Wu,Haodong Zhang,Kang Liang,Jianbin Li,Yurong Ren,Peng Wei
Mixed iron-based phosphate Na 4 Fe 3 (PO 4 ) 2 P 2 O 7 /C (NFPP) has gradually emerged as a promising cathode material for sodium-ion batteries (SIBs) owing to its affordability and convenient preparation. However, poor electrical conductivity and inadequate sodium-ion diffusion limit the exertion of its electrochemical properties. Herein, a structural modulation strategy based on Cd doping is applied to NFPP to address the above limitations. In situ X-ray diffraction analysis reveals that Cd-doped NFPP (NFCPP) undergoes an incomplete solid-solution reaction driven by Fe 2+ /Fe 3+ redox. Cd doping effectively stabilises the crystal structure, resulting in a minimal 1 % change in unit cell volume during cycling. Density of state calculations indicate that Cd doping reduces the band gap, increases the local electron density and significantly improves electron conductivity. Benefitting from the enhanced electrochemical kinetics and intercalation pseudocapacitance, the optimised Na 4 Fe 2.91 Cd 0.09 (PO 4 ) 2 P 2 O 7 /C (NFCPP@3%) exhibits exceptional rate performance (capacity of 62 mAh/g at 20 C) and ultra-long cycling life (82.7 % after 6000 cycles at 20 C). A full SIB prepared using NFCPP@3% and hard carbon, display a 91 % capacity retention rate at a current density of 130 mA g −1 over 200 cycles. This work demonstrates that doping can effectively enhance electrochemical performance and offers insights into future development of SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Zeliang Hou,Xingyue Liu,Guojun Wen,Shulan Jiang
CsPbCl 3 perovskite is considered as an ideal light absorber for ultraviolet (UV) photodetectors in virtue of its suitable wide bandgap and salient optoelectronic property. Nevertheless, the detection performance of the reported self-powered CsPbCl 3 UV photodetectors is far from satisfactory since it still remains challenging to fabricate high-quality CsPbCl 3 polycrystalline films with low trap-state density. Herein, a novel cadmium (Cd)-doping strategy is demonstrated by an evaporation method to manipulate the optical, electrical and morphological property of the CsPbCl 3 polycrystalline film for the first time. The incorporation of Cd 2+ ions into CsPbCl 3 lattice can effectively improve the crystallinity , grain sizes and UV harvesting capability of the CsPbCl 3 perovskite, while the defect state of the film gets pronouncedly suppressed. Thus, the overall performance of the charge-transport-layer-free Cd-doped CsPbCl 3 photodetectors attains an obvious enhancement. A thin MnS modification layer is further introduced to ameliorate the interfacial charge transport dynamics between the CsPbCl 3 and carbon layers . It is found that the MnS buffer layer can effectively reduce the interfacial barrier and accelerate the hole injection process , yielding a lower interfacial charge accumulation and recombination. The best-performing MnS-modified device achieves an ultra-high current on/off ratio of 3.97 × 10 5 and a high specific detectivity of 5.47 × 10 12 Jones at 0 V bias. This comprehensive performance is comparable to that of any other CsPbCl 3 photodetectors. Besides, the as-prepared CsPbCl 3 photodetectors possess superior operational and thermal stabilities. Our work opens up a new approach for the defect passivation of CsPbCl 3 perovskite and highlights its great application potential in high-performance UV detection.
研究领域:
材料科学
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光电技术
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半导体物理
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 26
·2503496
·
IF 26.8
Kaiqi Zhang,Yuling Huang,Shuang Liu,Qihong Xiong,Sikang Zheng,Bin Zhang,Guiwen Wang,Yu Pan,Guang Han,Guoyu Wang,Xu Lu,Xihan Chen,Xiaoyuan Zhou
Thermoelectric materials, like other electronic materials, require high carrier mobility, which is governed by carrier scattering potential. In addition to intrinsic acoustic phonon scattering, the extrinsic factors such as microstructure and atomic arrangement also have great influence on carrier transport in solids, e.g., the emerging thermoelectric material AgSbSe 2 with strong cation disorder. However, the experimental evaluation of total carrier scattering potential and distinguishing the contributions from intrinsic and extrinsic scatterings is challenging at present. Here, the time-resolved ultrafast spectroscopy analysis utilizing a pump-probe scheme is performed to characterize the charge carrier dynamics of AgSbSe 2 with femtosecond time resolution quantitatively. A significantly lowered total carrier scattering potential energy in Cd-doped AgSbSe 2 crystal is determined, resulting from the elimination of grain boundaries and the presence of short-range order that leads to a negative extrinsic scattering potential. The reduction in carrier scattering potential leads to a threefold increase in the average power factor from 323 to 723 K. A maximum thermoelectric figure of merit of 1.7 is achieved in high-quality AgSb 0.973 Cd 0.017 Se 2 crystal at 723 K, with the output efficiency of the single-leg thermoelectric device reaching a competitive value of 8%. This work reveals how to effectively characterize and modulate carrier scattering potential in thermoelectric compounds.
研究领域:
材料科学
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热电学
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凝聚态物理
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超快光谱学
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固体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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