Jeong Byeong Guk, Chang Jun Hyuk, Hahm Donghyo, Rhee Seunghyun, Park Myeongjin, Lee Sooho, Kim Youngdu, Shin Doyoon, Park Jeong Woo, Lee Changhee, Lee Doh C, Park Kyoungwon, Hwang Euyheon, Bae Wan Ki
SKKU Advanced Institute of Nano Technology and Department of Nano Engineering, Sungkyunkwan University, Suwon, Republic of Korea.
Samsung Display Research Center, Samsung Display, Yongin, Republic of Korea.
Nat Mater. 2022 Feb;21(2):246-252. doi: 10.1038/s41563-021-01119-8. Epub 2021 Nov 18.
The potential profile and the energy level offset of core-shell heterostructured nanocrystals (h-NCs) determine the photophysical properties and the charge transport characteristics of h-NC solids. However, limited material choices for heavy metal-free III-V-II-VI h-NCs pose challenges in comprehensive control of the potential profile. Herein, we present an approach to such a control by steering dipole densities at the interface of III-V-II-VI h-NCs. The controllable heterovalency at the interface is responsible for interfacial dipole densities that result in the vacuum-level shift, providing an additional knob for the control of optical and electrical characteristics of h-NCs. The synthesis of h-NCs with atomic precision allows us to correlate interfacial dipole moments with the NCs' photochemical stability and optoelectronic performance.
核壳异质结构纳米晶体（h-NCs）的势能分布和能级偏移决定了h-NC固体的光物理性质和电荷传输特性。然而，无重金属的III-V-II-VI h-NCs的材料选择有限，这给势能分布的全面控制带来了挑战。在此，我们提出一种通过调控III-V-II-VI h-NCs界面处的偶极密度来实现这种控制的方法。界面处可控的异价性导致了界面偶极密度，进而引起真空能级的移动，为控制h-NCs的光学和电学特性提供了一个额外的旋钮。具有原子精度的h-NCs的合成使我们能够将界面偶极矩与NCs的光化学稳定性和光电性能联系起来。
