Publisher : The Korean Institute of Surface Engineering
DOI : 10.5695/JKISE.2014.47.5.227
Title & Authors
Study of the Diffusion of Phosphorus Dependent on Temperatures for Selective Emitter Doping Process of Atmospheric Pressure Plasma Kim, Sang Hun; Yun, Myoung Soo; Park, Jong In; Koo, Je Huan; Kim, In Tae; Choi, Eun Ha; Cho, Guangsup; Kwon, Gi-Chung;
In this study, we propose the application of doping process technology for atmospheric pressure plasma. The plasma treatment means the wafer is warmed via resistance heating from current paths. These paths are induced by the surface charge density in the presence of illuminating Argon atmospheric plasmas. Furthermore, it is investigated on the high-concentration doping to a selective partial region in P type solar cell wafer. It is identified that diffusion of impurities is related to the wafer temperature. For the fixed plasma treatment time, plasma currents were set with 40, 70, 120 mA. For the processing time, IR(Infra-Red) images are analyzed via a camera dependent on the temperature of the P type wafer. Phosphorus concentrations are also analyzed through SIMS profiles from doped wafer. According to the analysis for doping process, as applied plasma currents increase, so the doping depth becomes deeper. As the junction depth is deeper, so the surface resistance is to be lowered. In addition, the surface charge density has a tendency inversely proportional to the initial phosphorus concentration. Overall, when the plasma current increases, then it becomes higher temperatures in wafer. It is shown that the diffusion of the impurity is critically dependent on the temperature of wafers.