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Direct Correlation of Organic Semiconductor Film Structure to Field-Effect Mobility



Dean M. DeLongchamp, S Sambasivan, Daniel A. Fischer, Eric K. Lin, Paul C. Chang, A R. Murphy, J M. Frechet, V Subramanian


Recent efforts towards the large-scale adoption of organic electronics have focused on maximizing device performance using new molecular designs and processing strategies. However, rational design and systematic progress are hindered by insufficient correlations between organic semiconductor film structure and field effect mobility. A particularly difficult challenge is the quantification of chemical conversion and concurrent molecular rearrangement in organic semiconductor precursor films. We demonstrate the use of near-edge x-ray absorption fine structure (NEXAFS) spectroscopy as a nondestructive technique to quantify the simultaneous chemical conversion, molecular ordering, and defect formation of soluble oligothiophene precursor films for application in organic field effect transistors. Variations in field-effect hole mobility with thermal processing are directly correlated to the orientation and distribution of molecules within 3 nm to 20 nm thick films.
Advanced Materials


NEXAFS, oligothiophene, organic electronics, sexithiophene, x-ray absorption spectroscopy


DeLongchamp, D. , Sambasivan, S. , Fischer, D. , Lin, E. , Chang, P. , Murphy, A. , Frechet, J. and Subramanian, V. (2005), Direct Correlation of Organic Semiconductor Film Structure to Field-Effect Mobility, Advanced Materials, [online], (Accessed April 23, 2024)
Created August 1, 2005, Updated February 19, 2017