对于常规叉指背接触（IBC）太阳电池，除了电池制备工艺复杂，还面临背表面开孔处复合速率高的问题，这妨碍了太阳电池性能进一步提升及成本的降低。近年来，隧穿氧化物钝化接触（TOP-Con）技术既能实现表面钝化且无需开孔接触,已成为国内外研究的热点，其特点是采用遂穿氧化物钝化晶体硅表面，以高掺杂硅薄膜实现选择性接触，有效降低了表面复合速率。本项目基于TOP-Con技术的特点，将TOPCon与IBC电池相结合，彻底根除背面金属与硅的直接接触，改善表面钝化，省去扩散工艺，最终实现提高电池转换效率和简化制备工艺的目的。本申请将通过IBC-TOPCon太阳电池的结构设计与优化、隧穿氧化层对IBC-TOPCon太阳电池光生载流子输运的影响研究以及IBC-TOPCon太阳电池表面钝化工艺的研究来加深对IBC-TOPCon太阳电池技术的认识，提高IBC太阳电池转换效率，形成具有自主知识产权的太阳电池新技术。

For conventional interdigitated back contact (IBC) silicon solar cells, the problem of high recombination rate at the opening as well as the complex process hampered the further increase in solar cell performance and the decrease in cost. Recently, the Tunnel Oxide Passivated Contact (TOPCon) solar cell technology has been a study focus in the world due to the excellent passivation ability without opening. The main feature of TOPCon is the surface-passivation by tunnel oxide and realized selective contact by highly doped silicon thin films, resulting in a very low recombination rate. In this project, TOPCon will be applied into IBC solar cells to improve the surface passivation and enhance the output of solar cells. The research will be focused on the innovative design and optimization of the IBC-TOPCon solar cells, the impact of tunnel oxide on the photo-generated carrier transport in IBC-TOPCon solar cells, and the surface passivation techniques of IBC-TOPCon solar cells. A series of novel techniques about solar cell fabrication is expected to be achieved though clear understanding the mechanism of IBC-TOPCon solar cells.