Carrier-Funneling-Induced Efficient Energy Transfer in CdSxSe1-x Heterostructure Microplates
Carrier-Funneling-Induced Efficient Energy Transfer in CdSxSe1-x Heterostructure Microplates
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CdSxSe1-x 异质结构微孔板中载流子漏斗诱导的高效能量转移
DOI：
10.1021/acsenergylett.9b01942
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发表时间：
2019
影响因子：
22
通讯作者：
Dapeng Yu
中科院分区：
文献类型：
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作者：
Weihao Zheng;Huawei Liu;Jun Xu;Ying Tang;Peng Fan;Wei Huang;Feng Jiang;Lihui Li;Xiaopeng Fan;Xiaoli Zhu;Xiujuan Zhuang;Anlian Pan;Dapeng Yu
半导体异质结微板（H-MPs）的能量传递对其所构成的各种光电器件的性能起着至关重要的作用。与紧凑的异质结构相比，H-MP中的能量转移涉及额外的载流子扩散过程，这导致异质界面处的低载流子数量，从而导致差的能量转移效率。基于能量泛函机制，CdSxSe 1-x横向H-MPs与带隙渐变的施主被设计成有效地和定向地驱动载流子到异质界面。阴极发光研究直观地呈现了载流子输运效率的增强。我们通过时间分辨光致发光实验系统地研究了H-MPs中的能量传递过程。与普通H-MP的低能输入效率（EIE）为109.3%相比，CdSxSe 1-xH-MP的低能输入效率（EIE）提高到109.3%。这种带隙工程给出了提高H-MP能量传输效率的通用策略。
The energy transfer of semiconductor heterostructure microplates (H-MPs) plays a crucial role in the performance of various optoelectronic devices they construct. Compared to compact heterostructures, the energy transfer in H-MPs involves an additional carrier diffusion process which results in a low carrier population at the heterointerface and thereby leads to a poor energy-transfer efficiency. Based on an energy-funneling mechanism, CdSxSe1–xlateral H-MPs with a bandgap-graded donor are engineered to efficiently and directionally drive carriers to the heterointerface. The cathode-luminescence study visually presents the enhancement of the carrier transport efficiency. We systematically studied the energy-transfer process in the H-MPs through time-resolved photoluminescence experiments. Compared to the low-energy input efficiency (EIE) of ∼20.5% in a common H-MP without a bandgap-graded donor, the EIE for a CdSxSe1–xH-MP with a bandgap-graded donor can be improved to ∼109.3%. This bandgap engineering gives a general strategy to improve the energy-transfer efficiency in H-MPs.