Preparation of Semiconducting Polymer Films by High Intensity Photo-Chemical Processes with Excimer Laser Beams.

Abstract

Excimer laser ablation (ELA) of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA), 3,4,9,10-perylenetetracarboxylic diimide (PTCDI), 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA) and perylene with 193(ArF), 248(KrF) and 308nni(XeCI) beams results in formation of amorphous semiconducting polymer thin films consisting of fine particles on several temperature-controlled substrates. The structure and electric conductivity of each prepared film depend considerably on the target material, ablation wavelength and substrate temperature. The films prepared on substrates at 300°C by ELA at 308nm from PTCDA and PTCDI partially contain polyperinaphthalene(PPN) structure with conductivity ranging from 10-1 to 10-2 Scm-1.

Preparation of polyperinaphthlenic organic semiconductor nano-particles by excimer laser ablation and application of a few electronicdevices

“…In recent years, particularly, preparation of PPN films by laser ablation has been attracted a great deal of attention. [5][6][7] In our previous paper [6,7], we found that excimer laser ablation ( prepared on substrates at 300°C by ELA at various fluences, structure of the nano-particles depended strongly on fluence. While the peak at 1296 cm' due to in-plane C-H bending remained in each nano-particles prepared at less than 0.5 Jcm2pulse1, it disappeared and the spectrum turned into that of common amorphous carbon with a peak at 1600cm1 and broad band around 1400 cm1 for each film prepared at more than 1.0…”

Investigation of thresholds in laser-induced carbonization of sumanene derivatives through in situ observation utilizing a Raman spectroscope

“…These carbon-based compounds have been synthesized by the pyrolysis of various organic compounds, including polymers, such as polyimide and p-conjugated low-molecularweight compounds, using heat sources such as electric furnaces [4][5][6][7][8][9][10] and lasers. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] Among these sources, laser is an attractive heat source because it has advantages that other heat sources do not possess. For example, laser enables a target to be heated rapidly to a very high temperature.…”

Chemical structure change of thin films prepared from nonpolymeric organic compounds by pulsed laser deposition

“…The chemical change allows the preparation of promising functional organic films with unique structures different from the original target materials. 1,2 The other purpose is thin film preparation with accurate structure transfer from the target of various polymers and of some nonpolymeric compounds. It has been known that the PLD technique enables preparation of thin films with similar structure as the target from organic polymers that are difficult to process, such as polytetrafluoroethylene ͑PTFE͒.…”