Process parameters affecting plasma enhanced crystallization of a-Si:H using a PECVD equipment [TFTs]

Abstract

Reports low temperature polysilicon layers obtained by plasma enhanced crystallization performed in the same PECVD system where the a-Si:H layers are deposited. We analyze the effects of phosphorous concentration in the layer, hydrogen dilution of silane, temperature of the hydrogen plasma process and annealing temperature on the crystallization time, surface texture and resistivity of the layers. Layers were characterized electrically, by X-ray diffractometry and by atomic force microscopy. The characteristics of the polycrystalline films are discussed and compared with those of polycrystalline layers obtained by other methods.