CHEMISTRY OF MATERIALS
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2016
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IF 9.407
Jie Fu,Qingwen Tian,Zhengji Zhou,Dongxing Kou,Yuena Meng,Wenhui Zhou,Sixin Wu
Additional elements in the Cu2ZnSn(S,Se)4 (CZTSSe) absorber layers can play a crucial role in improving the performance of thin film solar cells. In this paper, a significant performance enhancement of CZTSSe thin film solar cells was achieved by the partial substitution of the Zn2+ cation with Cd2+. A small amount of Cd2+ can be successfully incorporated into the host lattice of CZTSSe to form a homogeneous Cu2Zn1–xCdxSn(S,Se)4 (CZCTSSe) alloy material. We demonstrated that the crystal growth and the band gap of CZCTSSe thin films are affected by the Cd doping level. Additionally, the impact of Cd content on the space-charge density (Nc-v) and the depletion width (Wd) of CZCTSSe solar cells was systematically investigated. By this cation substitution approach, the power conversion efficiency of the solar cells based on the CZCTSSe absorber was successfully increased from 5.41 to 8.11% for the optimal composition (x = 5%).
研究领域:
材料科学
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光伏技术
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半导体物理
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高影响因子
Journal of Physical Chemistry C
·
2017
·
IF 4.536
Yiru Zhu,Shuwen Zhao,Bin Zhou,Hao Zhu,Youfa Wang
In this work, we report a phenomenon that upconversion emission intensity of Er3+ was enhanced by cadmium. Cd2+ was taken with 0, 3, 10, 20, 30, and 40 mol % as a new dopant to codope LiY0.78Yb0.20Er0.02F4, meanwhile the doping effects on the crystal structure, morphology, and upconversion fluorescence emission are investigated by XRD, Rietveld refinement, TEM, and upconversion spectroscopy analysis methods in detail. The green upconversion emission intensity was enhanced, and the maximum emission intensities were enhanced to twice when 10 mol % Cd2+ was codoped into tetragonal LiYF4, while its decay lifetime was reduced. Additionally, we further designed the synthesis of the homogeneous LiYF4:20%Yb,2%Er,10%Cd@LiYF4 of which the emission intensity is 11 times higher than that of the Cd2+-free nanocrystals, meanwhile an intriguing morphology of core–shell nanocrystals was obtained. This investigation may be useful for the design and improvement of upconversion materials for fulfilling the prerequisite of the practical application.
研究领域:
材料科学
·
光学
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DOI
高影响因子
ANALYST
·
2021
·Vol. 147
·期 2
·247-251
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IF 4.616
Jun-Tao Cao,Yi-Zhuo Fu,Xiao-Long Fu,Shu-Wei Ren,Yan-Ming Liu
Herein, a novel and facile dual-wavelength ratiometric electrochemiluminescence-resonance energy transfer (ECL-RET) sensor for hydrogen sulfide (H2S) detection was constructed based on the interaction between S2− and Cd2+-doped g-C3N4 nanosheets (NSs). Cd2+-doped g-C3N4 NSs exhibited a strong ECL emission at 435 nm. In the presence of H2S, CdS was formed in situ on g-C3N4 NSs by the adsorption of S2− and Cd2+, generating another ECL emission at 515 nm. Furthermore, the overlapping of the absorption spectrum of the formed CdS and the ECL emission spectrum of g-C3N4 NSs led to a feasible RET, thus quenching the ECL intensity from g-C3N4 at 435 nm. Through an ECL decrease at 435 nm and an increase at 515 nm, a dual-wavelength ratiometric ECL-RET system for H2S was designed. The sensor exhibited a lower detection limit of 0.02 μM with a wide linear range of 0.05–100.0 μM. In addition, the applicability of the method was validated by plasma sample analysis with a linear range of 80.0–106.0%. We believe that such a proposal would provide new insight into advanced dual-wavelength ECL ratiometric assays.
研究领域:
分析化学
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生物传感
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Cang Zhang,Ling He,Junhao Li,Kunpeng Shi,Peng Chang,Yujie Zheng,Yong Yang,Dacheng Zhou,Jianbei Qiu
Low-dimensional halide perovskites, as distinguished members of the perovskite family, have garnered significant attention due to their exceptional optical properties. However, strategies for dimensional phase-structure transition using low-dimensional precursors remain underexplored. Herein, a room-temperature two-step supersaturation recrystallization (SR) method was developed. The precursor perovskite Cs 3 Sb 2 Cl 9 was first synthesized, followed by the modulation of its luminescence properties. Subsequently, it was found that the addition of 1 mol CsCl and 1 mol MnCl 2 ·4H 2 O successfully yielded the two-dimensional (2D) metal halide perovskite Cs 4 MnSb 2 Cl 12 . Specifically, Mn 2+ ions were incorporated as luminescent centers, where equimolar CsCl and MnCl 2 ·4H 2 O (1 mmol each) induced a 2D phase-structure transition, enabling effective emission control. To address the weak orange-red emission of Cs 4 MnSb 2 Cl 12 , Cd 2+ was strategically doped to form Cs 4 Cd x Mn 1- x Sb 2 Cl 12 series. With increasing Cd 2+ content, non-monotonic luminescence enhancement was observed, reaching maximum intensity at x = 0.8. This is attributed to the Cd 2+ doping, which weakens the Mn–Mn coupling and breaks the symmetry of the [MnCl 6 ] 4− octahedra, thereby converting the parity-forbidden d–d transition of Mn 2+ into a partially spin-allowed transition and enhancing the Mn 2+ emission. Simultaneously, the improved crystallinity reduces the defect density, thus diminishing non-radiative decay via defect sites and ultimately leading to enhanced luminescence efficiency. This work enriches synthesis strategies for 2D metal halide layered perovskites and provides a novel approach for luminescence control of Sb-based systems.
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