Transparent solar cells are an attractive energy conversion device because it can be used in various applications in our daily life such as building-integrated photovoltaics. However, the transparent solar cells developed so far have limitations in efficiency, stability. Crystalline silicon (c-Si) would be one of the best candidates to develop transparent solar cells with high efficiency and stability because conventional c-Si solar cells are known to exhibit high efficiency and long-term stability compared to other solar cells. However, the opaque characteristic of the c-Si wafer hinders the development of transparent solar cells using c-Si. In this project, we present a novel approach to develop the world's first neutral-colour transparent c-Si solar cells which show the highest efficiency achieved among neutral-colour transparent solar cells to date.