Mechanism of Long-Range Energy Transfer from Quantum Dots to Black Phosphorus
Mechanism of Long-Range Energy Transfer from Quantum Dots to Black Phosphorus
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DOI：
10.1021/acs.jpcc.1c04562
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发表时间：
2021-07
期刊：
影响因子：
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通讯作者：
Suyog Padgaonkar;P. T. Brown;Yeonjun Jeong;Charles R Cherqui;K. Avanaki;Rafael López-Arteaga;Shawn Irgen-Gioro;Yue Wu;V. Sangwan;G. Schatz;M. Hersam;E. Weiss
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文献类型：
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作者：
Suyog Padgaonkar;P. T. Brown;Yeonjun Jeong;Charles R Cherqui;K. Avanaki;Rafael López-Arteaga;Shawn Irgen-Gioro;Yue Wu;V. Sangwan;G. Schatz;M. Hersam;E. Weiss
本研究探讨了从CdSe/ZnS核壳量子点（QD）自组装膜到剥离的黑磷（BP）纳米片通过不同厚度的AlOx封装层的长程能量转移（EnT）机制。EnT速率对供体-受体距离d的依赖性按比例缩放为Δ d-2.3，这比从零维（0 D）供体到2D或3D受体的Fo Errster型EnT的预期缩放要浅。电动力学模拟表明，有效的长程EnT主要归因于QD膜的高面积浓度，这导致相邻QD对施主QD偶极场的散射，从而有效地增加了施主和受主耦合的面积。通过钝化介电层对BP光敏化的定量理解将有助于指导基于环境反应性层状半导体的高性能光电器件的开发。
This study explores the mechanisms of long-range energy transfer (EnT) from a self-assembled film of CdSe/ZnS core–shell quantum dots (QDs) to exfoliated black phosphorus (BP) nanoflakes through an AlOxencapsulation layer of variable thickness. The dependence of the EnT rate on donor–acceptor distance,d, scales as ∼d–2.3, which is shallower than the expected scaling for Förster-type EnT from a zero-dimensional (0D) donor to a 2D or 3D acceptor. Electrodynamic simulations reveal that the efficient long-range EnT is primarily attributable to the high areal concentration of the QD film, which results in scattering of the donor QD dipole field by neighboring QDs, thereby effectively increasing the area over which the donor and acceptor couple. This quantitative understanding of the photosensitization of BP through a passivating dielectric layer will help guide the development of high-performance optoelectronic devices based on ambient-reactive layered semiconductors.