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Optical properties of HgTe colloidal quantum dots

机译:HgTe胶体量子点的光学性质

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Room temperature photodetection with HgTe colloidal quantum films is reported between 2 and 5μm for particles of sizes between ~5 and ~12nm diameter, and photodetection extends to 7mu;m at 80K. The size-tuning of the absorption of HgTe colloidal quantum dots, their optical cross section and the infrared absorption depth of films are measured. The tuning with radius is empirically given by λ _(BE) ~(QE),30.5/√1+(43/ R _(QD)) ~2 -1where R is in nm. The optical cross section of the colloidal dots at 415nm is approximately proportional to their volume and given by Q _(Hg) ~(415)=2.6±0.4× 10 ~(-17)atom. The size-dependent optical cross section at the band edge 1.5×10 ~(15)cm ~2 is consistent with the expected oscillator strength of the quantum dots. The absorption depth of HgTe colloidal dot films is short, about 12m, which is an advantage for thin film devices. These properties agree rather well with the expectation from the kp model. HgTe colloidal quantum dot thin films show a strong tuning with temperature with a large positive thermal shift between 0.4 and 0.2meVK ~1, decreasing with decreasing size within the size range studied and this is attributed primarily to electronphonon effects.
机译:HgTe胶体量子膜在室温下对2〜5μm的光电探测器被报道,直径在5〜〜12nm左右,在80K时光电探测扩展到7μm。测量了HgTe胶体量子点的吸收尺寸,其光学截面和薄膜的红外吸收深度。根据经验,半径的调谐由λ_(BE)〜(QE),30.5 /√1+(43 / R _(QD))〜2 -1给出,其中R的单位为nm。胶体点在415nm处的光学截面与它们的体积大致成正比,由Q_(Hg)〜(415)= 2.6±0.4×10〜(-17)原子给出。在1.5×10〜(15)cm〜2的能带边缘处,与尺寸有关的光学截面与量子点的预期振荡强度一致。 HgTe胶体点膜的吸收深度短,约为12m,这对于薄膜器件是有利的。这些特性与kp模型的预期非常吻合。 HgTe胶体量子点薄膜显示出随温度的强调谐,在0.4和0.2meVK〜1之间有较大的正热位移,在研究的尺寸范围内随着尺寸的减小而减小,这主要归因于电子声子效应。

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