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Optical and electrical properties of laser ablated amorphous LiCoO2 thin film cathodes

Thin films of LiCoO2 were prepared by pulsed laser deposition technique. Two important deposition parameters such as substrate temperature and oxygen partial pressure during the thin film deposition were controlled. The optical absorbance of LiCoO2 thin films have been studied in the vicinity of the fundamental absorption edge. We observed a gradual increase of the optical absorption from 400 to 1000 nm with the appearance of a prominent step at 750 nm. Electrical transport plays an important role in the performance of the electrode in the lithium microbattery. The electrical conductivity of LiCoO2 varies from 10 -9 to 10 -4 S/cm in the temperature range from 180 to 500 K. FTIR supported the optical data. These results suggest that the open and porous structured LiCoO2 PLD films find potential applications as binder free electrode in the fabrication of all solid state microbatteries.