Targeted transfer of self-assembled CdSe nanoplatelet film onto WS2 flakes to construct hybrid heterostructures

• 作者: Zeguo Song Yunkun Wang Yunke Zhu Peng Bai An Hu Yunan Gao
• 来源期刊: 半导体学报（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: ARTICLES
• 页码范围: 81-85
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-4926/42/8/082901

摘要

Colloidal CdSe nanoplatelets are thin semiconductor materials with atomic flatness surfaces and one-dimensional strong quantum confinement,and hence they own very narrow and anisotropic emission.Here,we present a polydimethylsilox-ane(PDMS)assisted transferring method that can pick up single layer CdSe nanoplatelet films self-assembled on a liquid sur-face and then precisely transfer to a target.By layer-by-layer picking up and transferring,multiple layers of CdSe films can be built up to form CdSe stacks with each single layer having dominant in-plane transition dipole distribution,which both materi-al and energic structures are analogous to traditional multiple quantum wells grown by molecular-beam epitaxy.Additionally,with the great flexibility of colloidal nanoplatelets and this transferring method,CdSe nanoplatelets films can be combined with other materials to form hybrid heterostructures.We transferred a single-layer CdSe film onto WS2 flakes,and precisely stud-ied the fast energy transfer rate with controlled CdSe nanoplatelet orientation and by using a streak camera with a ps time resol-ution.