H2O induced structural modification of pentacene crystal

作者：Lee Kyoung Jae; Ihm Kyuwook^*; Kang Tai Hee; Chung Sukmin

来源：Surface Science, 2009, 603(24): 3445-3447.

DOI：10.1016/j.susc.2009.10.013

• Near edge extended X-ray absorption fine structure (NEXAFS)
• Synchrotron radiation photoelectron spectroscopy
• Adsorption kinetics
• Atom-solid interactions
• Water
• Pentacene

Water is one of the obstacles for prolonged life-time of organic based field-effect-transistors (OFETs). Here, we show how H2O molecules adsorb and affect pentacene crystal by using photoelectron spectroscopic methods. Diffusion into the crystal is accompanied with accumulation of H2O onto the crystal. Valence band, core level, and X-ray absorption spectra show that H2O molecules physisorb on the pentacene surface via oxygen, resulting in the increase of the hole-injection barrier. The diffused molecules results in the deteriorated crystallinity, and they reflect the weakening inter-molecular interactions of pentacene crystal.

• 出版日期2009-12-15