Study of (SOI)-S-Beta Epsilon MOSFET Reconfigurable Transistor for Biosensing Application

Autor(es)

Yojo, L. S. ^[1] ; Rangel, R. C. ^{[1, 2]} ; Sasaki, K. R. A. ^[1] ; Martino, J. A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, LSI PSI USP, Sao Paulo - Brazil

^[2] Fac Tecnol Sao Paulo, FATEC SP, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY; v. 10, n. 2 FEB 1 2021.
• Citações Web of Science: 0

Resumo

The Back Enhanced SOI ((SOI)-S-BE MOSFET) is a planar reconfigurable device, which transistor type (n- or p-type) can be programed by the back-gate bias. This transistor is explored in this paper for biosensing application through numerical simulation, based on the fabricated device experimental results. The permittivity value and the charges inside the biomaterial deposited on the underlap region (between gate and source/drain contacts) influence the (SOI)-S-BE MOSFET drain current. The dimensions of the device were evaluated in order to optimize the sensitivity. Among the studied parameters, the underlap length was the most relevant parameter. For short underlap devices, the fringe electric field from the front gate electrode benefits the permittivity-based sensors, while long underlap length devices have a bigger sensitive area in which the charge-based sensor presented better results. Also, the n-type biased device presented higher sensitivity to positively charged materials, while the p-type biased one presented better result for negatively charged materials. The parameters optimization resulted in one order magnitude improvement of the sensitivity for the permittivity-based sensor, for both n- and p-type. As for the charge-based sensor, the optimized device presented twice as bigger sensitivity for the n-type, and at least eight times improvement for the p-type device. This fact represents an advantage of the (SOI)-S-BE structure as the type of the device can be chosen by the back-gate bias. (AU)

• Processo FAPESP: 18/01568-4 - Otimização de transistores BE SOI MOSFET como plataforma para aplicação em biossensores
• Beneficiário: Leonardo Shimizu Yojo
• Modalidade de apoio: Bolsas no Brasil - Doutorado