| AVS 58th Annual International Symposium and Exhibition | |
| Nanometer-scale Science and Technology Division | Monday Sessions |
| Session NS+EM-MoM |
| Session: | Nanowires and Nanoparticles I: Assembly and Devices |
| Presenter: | SeongJoon Lim, Seoul National University, Republic of Korea |
| Authors: | S.J. Lim, Seoul National University, Republic of Korea J. Kwon, Seoul National University, Republic of Korea Y. Oh, Seoul National University, Republic of Korea B.L. Choi, Samsung Advanced Institute of Technology, Republic of Korea K. Cho, Samsung Advanced Institute of Technology, Republic of Korea Y. Kuk, Seoul National University, Republic of Korea |
| Correspondent: | Click to Email |
In our previous study, we were able to fabricate full-color, 4-inch display made of colloidal quantum dot (QD). Despite such a demonstration of QD light emitting device which is one of candidates for next-generation display, understanding the interface characteristics between QD layer and electron (or hole) accumulation layer is still lacking and further study for improvement of quantum efficiency is essential. Here, we report on a study of scanning tunneling microscopy (STM), spectroscopy (STS) and cathode luminescence induced by tunneling current, performed on individually manipulated QD. We control the distance between two QDs using STM to reveal the mechanism of interaction between QDs. STS measurement showed shift of energy levels as manipulating the distance between two QDs. This result suggests that there exists the optimal distance between QDs for efficient light emission. Besides by making contacts between separated QDs and organic molecules, we simulated contacts between QD layer and electron (or hole) accumulation layer. From these experiments, we could understand excitonic behavior and carrier hopping from QD to QD or surrounding materials. Our findings thus suggest optimal configuration for QD application in display.