title: Bond cutting in Cs-doped tris(8-hydroxyquinoline) aluminium.
abstract: A series of Cs 4d and Al 2p spectra associated with valence-band and cut-off spectra have been used to characterize the interaction between caesium and tris(8-hydroxyquinoline) aluminium (Alq(3)) molecules in a Cs-doped Alq(3) layer. The Cs 4d and Al 2p spectra were tuned to be very surface sensitive by selecting a photon energy of 120 eV at the National Synchrotron Radiation Research Center, Taiwan. A critical Cs concentration exists, above which a new Al 2p signal appears next to the Al 2p peak of Alq(3) in the lower binding-energy side. The Al 2p signal was analyzed and assigned as being contributed from a mixture of Alq(2), Alq and Al. Experimental data supported the observation that bond cutting of Alq(3) by the doped Cs atoms occurred at high Cs doping concentration.
authors: Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
authors: Hsin Han
authors: HH
authors: Lee
authors: J
authors: J
authors: Hwang
authors: Tun Wen
authors: TW
authors: Pi
authors: Y C
authors: YC
authors: Wang
authors: W J
authors: WJ
authors: Lin
authors: C P
authors: CP
authors: Cheng