CPM Seminar

Single-walled carbon nanotube integrated charge sensor

Xin Zhou

Advanced Device Laboratory
RIKEN Advanced Science Institute

Here, we introduce our efforts for realizing single-walled carbon nanotube (SWCNT) integrated single electron devices. In order to achieve the integration, we developed growth technique to grow well aligned SWCNTs on quartz substrates by using CVD system. These well aligned SWCNTs are then transferred from quartz substrates to the SiO₂ substrates by transfer-printed technique. This transfer-printed technique effects on the quality of SWCNTs will be discussed based on the measurement results of SWCNT-SET devices, which were fabricated based on this technique. The SWCNT integrated charge sensor device has also been fabricated based on two parallel SWCNTs by taking advantage of this technique. The charge sensor is composed by SWCNT-dots and a SWCNT-SET, which are capacitively coupled with each other. The single charge sensing phenomenon is observed in the detector current when the electron numbers in SWCNT-dots is changed. Shifts of the Coulomb oscillation peaks in the SWCNT-SET due to the single electron event have also been observed. The success of charge sensor demonstrates one promising method to achieve the CNT integrated single electron devices and circuits.