The present article gives a summary of recent technology and scientific developments in the field of thin film solar cells in various substrates layers method. Cost effective fabrication methods and cheap substrate materials make poly-silicon thin film solar cells promising candidates for photovoltaic cells applications. However, it is still the challenge for research and development to achieve the necessary high electrical material quality known from crystalline silicon wafers on glass as a prerequisite to harvest the advantages of thin film technologies. Phase crystallization methods by laser or electron beam. The status of four different thin film solar cells concepts is summarized, by comparing the technological methods, as well as the structural and electrical properties and solar cell performance of the respective materials were discussed. In the second part, highly auspicious properties regarding material quality and throughout aspects were discussed during fabrication.