| Summary: | 碩士 === 國防大學理工學院 === 電子工程碩士班 === 100 === In this research, metal thin film coating on silicon base plate was grown by thermal evaporation and the nano-particles were formed by the following high-temperature annealing treatments. The nanoparticle size was dependent on three importance conditions which were deposition thickness of thin film, thermal annealing temperature and thermal annealing time. The island structures or condensed nano-scaling particles were nucleated from the original metal thin film by thermal annealing process (the particle size was controlled in range between several dozens and hundreds of nanometers). The absorption spectrums were measured and, which differences were analyzed from variant size of particles. These results were further applied to the solar cell and promoted its photoelectric conversion efficiency.
Experiment shows that grown the silver film thickness 28.7nm by thermal evaporation,and the environmental parameter as follow, vacuum degree is 4×10-7 Torr, the current is 40A keep in 30sec, the annealing temperature of 400℃, 20 minutes after heat treatment. the formation of silver particle size at 95~ 270nm which had the best electric characteristic, increased by 152 times compared to the non-light measurement was informed that the irradiation halogen.
The above parameters used in solar cells, and cpmpare with the sample which hadn’t coat thin film yet. the conversion efficiency is 9.55% before coat.After coat thin film ,the conversion efficiency rise up to 9.77%, the solar cell conversion efficiency totally rise up 2.3%.
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