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首页> 外文期刊>Journal of Crystal Growth >Influence of strain reducing layers on electroluminescence and photoluminescence of InAs/GaAs QP structures
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Influence of strain reducing layers on electroluminescence and photoluminescence of InAs/GaAs QP structures

机译:应变降低层对InAs / GaAs QP结构的电致发光和光致发光的影响

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摘要

We present a comparison of photo- (PL) and electro-luminescence (EL) spectra of quantum dot (QP) structures with different strain reducing layers (SRL). Simple QP structures without SRL have negligible difference between the PL and EL maxima, which are near 1250 nm. InGaAs and GaAsSb SRLs were used to shift the luminescence maximum towards telecommunication wavelengths at 1.3 or 1.55 μm. We have found that MOVPE prepared QD structures with SRL exhibit an EL maximum at a considerably shorter wavelength than the PL maximum measured on similar samples without doping in the absence of built-in electric field. A mechanism to explain this phenomenon is proposed for both types of SRLs. The GaAsSb SRL is more suitable for long wavelength EL due to the higher confinement potential of electrons compared to InGaAs SRL. EL maximum at 1300 nm and PL maximum at 1520 nm were achieved on InAs QD structures with GaAs_(0.87)Sb_(0.13) SRL (type I heterojunction).
机译:我们比较了具有不同应变减小层(SRL)的量子点(QP)结构的光(PL)和电致发光(EL)光谱。没有SRL的简单QP结构在PL和EL最大值之间的差异可忽略不计,接近1250 nm。 InGaAs和GaAsSb SRL用于将最大发光方向移向1.3或1.55μm的电信波长。我们已经发现,MOVPE制备的带有SRL的QD结构在比没有相似的样品在没有内置电场的情况下进行掺杂所测得的PL最大值短得多的波长下显示EL最大值。对于两种类型的SRL,都提出了一种解释这种现象的机制。 GaAsSb SRL与InGaAs SRL相比,具有更高的电子约束电位,因此更适合于长波长EL。在具有GaAs_(0.87)Sb_(0.13)SRL(I型异质结)的InAs QD结构上,实现了1300 nm处的EL最大和1520 nm处的PL最大。

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