Hybrid systems consisting of colloidal CdS/ZnS core shell quantum dots on ZnSe semiconductor substrates have been studied by continous-wave and nanosecond time-resolved photoluminescence. Depending on the size of the CdS cores the dominating transfer mechanism is changing. Comparing the photoluminescence transients of the dots with different diameter on ZnSe with respective results on ZnMnSe and quartz substrates we were able to reveal the dominant transfer mechanisms from the dots to ZnSe substrates. The considered transfer mechanisms being either resonance energy transfer, photon reabsorption and electron or hole tunneling. Finally, we were able to determine the conduction band offset between CdS and ZnSe to 0.56eV at 10K.

中文翻译：

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在 ZnSe 衬底上具有胶体核壳量子点的半导体杂化物的转移机制

通过连续波和纳秒时间分辨光致发光研究了由 ZnSe 半导体衬底上的胶体 CdS/ZnS 核壳量子点组成的混合系统。根据 CdS 内核的大小，主要的传输机制正在发生变化。将 ZnSe 上不同直径的点的光致发光瞬态与 ZnMnSe 和石英衬底上的各自结果进行比较，我们能够揭示从点到 ZnSe 衬底的主要转移机制。所考虑的转移机制是共振能量转移、光子重吸收和电子或空穴隧穿。最后，我们能够确定 CdS 和 ZnSe 之间的导带偏移在 10K 时为 0.56eV。