| Title | Lateral quantum confinement regulates charge carrier transfer and biexciton interaction in CdSe/CdSeS core/crown nanoplatelets |
| Authors | Yao, Yige Bao, Xiaotian Zhu, Yunke Sui, Xinyu Hu, An Bai, Peng Wang, Shufeng Yang, Hong Liu, Xinfeng Gao, Yunan |
| Affiliation | Peking Univ, Sch Phys, State Key Lab Artificial Microstruct & Mesoscop Ph, Beijing 100871, Peoples R China Natl Ctr Nanosci & Technol, CAS Key Lab Standardizat & Measurement Nanotechnol, Beijing 100190, Peoples R China Univ Chinese Acad Sci, Beijing 100049, Peoples R China Frontiers Sci Ctr Nanooptoelectron, Beijing 100871, Peoples R China Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R China Peking Univ, Yangtze Delta Inst Optoelect, Nantong 226010, Peoples R China Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China |
| Keywords | AMPLIFIED SPONTANEOUS EMISSION BINDING-ENERGY CDSE NANOPLATELETS EXCITON LOCALIZATION AUGER RECOMBINATION ELECTRON-TRANSFER EFFICIENT SPECTROSCOPY DOTS ZNO/ZNMGO |
| Issue Date | Mar-2023 |
| Publisher | NANO RESEARCH |
| Abstract | Charge carrier dynamics essentially determines the performance of various optoelectronic applications of colloidal semiconductor nanocrystals. Among them, two-dimensional nanoplatelets provide new adjustment freedom for their unique core/crown heterostructures. Herein, we demonstrate that by fine-tuning the core size and the lateral quantum confinement, the charge carrier transfer rate from the crown to the core can be varied by one order of magnitude in CdSe/CdSeS core/alloy-crown nanoplatelets. In addition, the transfer can be affected by a carrier blocking mechanism, i.e., the filled carriers hinder further possible transfer. Furthermore, we found that the biexciton interaction is oppositely affected by quantum confinement and electron delocalization, resulting in a non-monotonic variation of the biexciton binding energy with the emission wavelength. This work provides new observations and insights into the charge carrier transfer dynamics and exciton interactions in colloidal nanoplatelets and will promote their further applications in lasing, display, sensing, etc. |
| URI | http://hdl.handle.net/20.500.11897/673031 |
| ISSN | 1998-0124 |
| DOI | 10.1007/s12274-023-5542-0 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 人工微结构和介观物理国家重点实验室 |
