%0 Journal Article
%T Electronic structure and chemical reaction of Ca deposition on regioregular poly(3-hexylthiophene) surfaces
%A Wei Zhao
%A YuXian Guo
%A XueFei Feng
%A Liang Zhang
%A WenHua Zhang
%A JunFa Zhu
%J Chinese Science Bulletin
%@ 1861-9541
%D 2009
%I 
%R 10.1007/s11434-009-0184-5
%X Conjugated polymer, regioregular poly(3-hexylthiophene) (rr-P3HT), films were prepared by spin-coating the rr-P3HT chloroform solution onto clean silicon wafer surfaces. The chemical reaction and electronic structure of Ca deposition on rr-P3HT surfaces were in situ investigated by synchrotron radiation photoemission spectroscopy (SRPES) and X-ray photoemission spectroscopy (XPS). Upon Ca deposition, Ca-induced band bending of rr-P3HT is observed. In addition, Ca atoms preferentially react with S atoms of rr-P3HT. No obvious reaction between Ca and C atoms can be found. Through the investigation of the evolution of valence band spectra and secondary electron cut-off of rr-P3HT during the process of Ca deposition, an energy level alignment diagram at the Ca/rr-P3HT interface is derived.
%K synchrotron radiation photoemission
%K XPS
%K rr-P3HT
%K calcium
%K chemical reaction
%K electronic structure
%U http://link.springer.com/article/10.1007/s11434-009-0184-5