S1 Electronic Supplementary Information Rapid and Label-Free Bacteria Detection using Hybrid Tri-layer Dielectrics Integrated n-Type Organic Field Effect Transistor Anamika Dey, a Ashish Singh, a Deepanjalee Dutta, a Siddhartha Sankar Ghosh a,b, *and Parameswar Krishnan Iyer a,c, * a Centre for Nanotechnology, b Department of Biosciences & Biotechnology, c Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India. Corresponding Author *Prof. Parameswar Krishnan Iyer c Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India. Fax: (+) 91 361 2582314. E-mail: pki@iitg.ac.in *Prof. Siddhartha Sankar Ghosh b Department of Biosciences & Biotechnology, Indian Institute of Technology Guwahati, Guwahati- 781039, Assam, India. E-mail: sghosh@iitg.ac.in Table of Contents 1. Device Fabrication Method……………………………………………………………... 2 2. TiO 2 sol-gel dielectric synthetic protocol……………………………………..………… 2 3. Thin film growth structure of TiO 2 dielectric…………………………………………… 2 4. AFM analysis………………………………………………………………..…………... 3 5. Device standardization and characterization………………………………………......... 4 6. Electrical stability and compatibility study……………………………………………... 6 7. FESEM images………………………………….…………………………………….. 7 8. OFET device architecture……………………………………………………………….. 7 9. Bacterial plating…………………………..……………………………………………. 7 10. Summary of recent literature data …………………………..…………………………. 8 Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is © The Royal Society of Chemistry 2019