Rigosi Albert F, Kruskopf Mattias, Panna Alireza R, Payagala Shamith U, Jarrett Dean G, Newell David B, Elmquist Randolph E
National Institute of Standards and Technology, 100 Bureau Drive, Stop 8171, Gaithersburg, MD, 20899, USA.
University of Maryland, Joint Quantum Institute, College Park, MD, 20742, USA.
IEEE Trans Instrum Meas. 2020;1. doi: 10.1109/CPEM49742.2020.9191783.
This work presents one solution for long-term storage of epitaxial graphene (EG) in air, namely through the functionalization of millimeter-scale devices with chromium tricarbonyl - Cr(CO). The carrier density may be tuned reproducibly by annealing below 400 K due to the presence of Cr(CO). All tuning is easily reversible with exposure to air, with the idle, in-air, carrier density always being close to the Dirac point. Precision measurements in the quantum Hall regime indicate no detrimental effects from the treatment, validating the pursuit of developing air-stable EG-based QHR devices.
这项工作提出了一种在外延石墨烯（EG）在空气中长期存储的解决方案，即通过用三羰基铬-Cr(CO)对毫米级器件进行功能化。由于Cr(CO)的存在，通过在400 K以下退火可以可重复地调节载流子密度。所有调节在暴露于空气时都很容易逆转，闲置时在空气中的载流子密度始终接近狄拉克点。量子霍尔 regime中的精确测量表明该处理没有有害影响，验证了开发基于空气稳定的EG的QHR器件的追求。
