Our laboratory has been selected as the only nationwide for “Green Energy Technology (GET)-Future Project: Non-Silicon based Thin Film Solar Cells (TFSCs) Technology Project”, which is one of the human resource development programs of the Korea Energy Technology Evaluation & Research Institute under the Ministry of Commerce, Industry and Energy, South Korea. Under the GET-Future project, we are focusing on the development of low-cost and earth-abundant Cu2ZnSnS4 (CZTS)-based high efficiency TFSCs. Starting with 1.2% efficiency for CZTS-based TFSCs in 2012 at the initial stage of GET-Future project, the gradual and significant improvement in the efficiency has been achieved to 8.3% in 2014, 9.2% in 2015, 10.4% in 2016, and 11.8% in 2017 through the continuous technology development. Till the date, the achieved efficiency of 11.8% for CZTS-based TFSCs is very close to the world-record efficiency of 12.6% by the IBM group, USA. Four small and medium-sized enterprises (SNTEC Inc., Alpha Plus Inc, Isaac Research Inc., and Solardin Inc. ) and Korea Institute of Industrial Technology (Honam Regional Headquarters, Solar Center) have been participated in this project. We are doing our best to lead this CZTS-based TFSCs technology developed through GET-Future project to actual commercialization.