In this study, we propose the fabrication of monolithic crystalline silicon solar cells with Tb^(3+) and Yb^(3+)-doped silicon nitride(SiN_x) layers by low-cost screen-printing methods. The performances of c-Si solar ...In this study, we propose the fabrication of monolithic crystalline silicon solar cells with Tb^(3+) and Yb^(3+)-doped silicon nitride(SiN_x) layers by low-cost screen-printing methods. The performances of c-Si solar cells can be enhanced by rare-earth ions doped SiN_x layers via the mechanism of spectrum conversion.These SiN_x doped and codoped thin films were deposited by reactive magnetron co-sputtering and integrated as the antireflection coating layers in c-Si solar cells. The characterizations of SiN_x, SiN_x:Tb^(3+) tand SiN_x:Tb^(3+)-Yb^(3+) thin films were conducted by means of photoluminescence, Rutherford backscattering spectroscopy, Ellipsometry spectroscopy and Fourier transform infrared measurements. Their composition and refractive index was optimized to obtain good anti-reflection coating layer for c-Si solar cells.Transmission electron microscopy performs the uniform coatings on the textured emitter of c-Si solar cells. After the metallization process, we demonstrate monolithic c-Si solar cells with spectrum conversion layers, which lead to a relative increase by 1.34% in the conversion efficiency.展开更多
1 wt pct Nd2O3-doped tellurite bulk glass and fiber with the same composition of 75TeO2-15ZnO-5Na2O-5Li2O4(mol fraction, %) were fabricated. Judd-Ofelt analysis was carried out for the bulk. The emission from the 4F3/...1 wt pct Nd2O3-doped tellurite bulk glass and fiber with the same composition of 75TeO2-15ZnO-5Na2O-5Li2O4(mol fraction, %) were fabricated. Judd-Ofelt analysis was carried out for the bulk. The emission from the 4F3/2→4I13/2 transition in fiber is at 1.33 μm wavelength with a spectral bandwidth of 55 nm, which is similar to that in bulk. In the case of the fiber, the lifetime of 4F3/2 Ievel is 164 μs, and the quantum efficiency is -100%. The figure-of-merit for gain (<δpTo) for Nd3+-doped tellurite glass is about 2.8×10-24 cm2·S, which is quite comparable vvith that in Nd3+-doped fluoroaluminate glasses, and is an order of magnitude larger than Pr3+-doped fluoride glasses.展开更多
研究了 Sr S∶ Eu,Sm,Ce在紫外和蓝光辐照下的光激励发光 ,分析了不同写入光激发下光激励发射谱的差异 ,发现空穴束缚对其起决定性的作用。对电子发生转移的途径和光激励过程中电子的释放过程以及基质中不同稀土离子的作用进行了探讨。...研究了 Sr S∶ Eu,Sm,Ce在紫外和蓝光辐照下的光激励发光 ,分析了不同写入光激发下光激励发射谱的差异 ,发现空穴束缚对其起决定性的作用。对电子发生转移的途径和光激励过程中电子的释放过程以及基质中不同稀土离子的作用进行了探讨。与双掺杂的 Sr S∶Eu,Sm及 Sr S∶Ce,Sm相比 ,Sr S∶ Eu,Sm,Ce的存储密度有进一步的提高。展开更多
By using the re-derived formulae for both line-strength of electricdipole transition and simple J-mixing coefficients within the 4f shell in a rare-earthion, the spectroscopic properties of the luminescent material Eu...By using the re-derived formulae for both line-strength of electricdipole transition and simple J-mixing coefficients within the 4f shell in a rare-earthion, the spectroscopic properties of the luminescent material Eu3+ =Y2O3 and laser crystals Tb3+:=YAlO3 and Nd3+:YVO4, are investigated in detail. On the basis of three fitting Ω parameters and the effective reduced matrix elements, the spectral linestrengths, spontaneous emission probabilities, fluorescent branching ratios and lifetimeare calculated. The better agreement between theoretical results and experimental dataindicates the importance of J-mixing in the spectroscopic study of laser crystals.展开更多
基金Project supported by Ministry of Science and Technology,Taiwan(MOST 105-2911-I-259-501)the French Agence Nationale de Recherche through the GENESE Project(ANR-13-BSS09-0020-01)the French Ministry of Research through the ORCHID Project(33572XF)
文摘In this study, we propose the fabrication of monolithic crystalline silicon solar cells with Tb^(3+) and Yb^(3+)-doped silicon nitride(SiN_x) layers by low-cost screen-printing methods. The performances of c-Si solar cells can be enhanced by rare-earth ions doped SiN_x layers via the mechanism of spectrum conversion.These SiN_x doped and codoped thin films were deposited by reactive magnetron co-sputtering and integrated as the antireflection coating layers in c-Si solar cells. The characterizations of SiN_x, SiN_x:Tb^(3+) tand SiN_x:Tb^(3+)-Yb^(3+) thin films were conducted by means of photoluminescence, Rutherford backscattering spectroscopy, Ellipsometry spectroscopy and Fourier transform infrared measurements. Their composition and refractive index was optimized to obtain good anti-reflection coating layer for c-Si solar cells.Transmission electron microscopy performs the uniform coatings on the textured emitter of c-Si solar cells. After the metallization process, we demonstrate monolithic c-Si solar cells with spectrum conversion layers, which lead to a relative increase by 1.34% in the conversion efficiency.
基金This work was supported by the N ational Natural Science Foundation of China(Contract No.60207006)Project of Optical Science and Technology of Shanghai(Contract No.022261046)Science and Technique Qimingxing Fund of Shanghai(No.04QMX1448).
文摘1 wt pct Nd2O3-doped tellurite bulk glass and fiber with the same composition of 75TeO2-15ZnO-5Na2O-5Li2O4(mol fraction, %) were fabricated. Judd-Ofelt analysis was carried out for the bulk. The emission from the 4F3/2→4I13/2 transition in fiber is at 1.33 μm wavelength with a spectral bandwidth of 55 nm, which is similar to that in bulk. In the case of the fiber, the lifetime of 4F3/2 Ievel is 164 μs, and the quantum efficiency is -100%. The figure-of-merit for gain (<δpTo) for Nd3+-doped tellurite glass is about 2.8×10-24 cm2·S, which is quite comparable vvith that in Nd3+-doped fluoroaluminate glasses, and is an order of magnitude larger than Pr3+-doped fluoride glasses.
文摘研究了 Sr S∶ Eu,Sm,Ce在紫外和蓝光辐照下的光激励发光 ,分析了不同写入光激发下光激励发射谱的差异 ,发现空穴束缚对其起决定性的作用。对电子发生转移的途径和光激励过程中电子的释放过程以及基质中不同稀土离子的作用进行了探讨。与双掺杂的 Sr S∶Eu,Sm及 Sr S∶Ce,Sm相比 ,Sr S∶ Eu,Sm,Ce的存储密度有进一步的提高。
文摘By using the re-derived formulae for both line-strength of electricdipole transition and simple J-mixing coefficients within the 4f shell in a rare-earthion, the spectroscopic properties of the luminescent material Eu3+ =Y2O3 and laser crystals Tb3+:=YAlO3 and Nd3+:YVO4, are investigated in detail. On the basis of three fitting Ω parameters and the effective reduced matrix elements, the spectral linestrengths, spontaneous emission probabilities, fluorescent branching ratios and lifetimeare calculated. The better agreement between theoretical results and experimental dataindicates the importance of J-mixing in the spectroscopic study of laser crystals.
