Abstract

This chapter discusses the development of interdigitated back-contact (IBC) solar cells. These cells have several advantages over conventional two-sided contacted solar cells, including low series resistance for concentrator application and reducing shadow loss. Several variants in the design have been investigated, including front surface field (FSF), front floating emitter (FFE), and point-contact (PC) solar cells. Edge recombination and its relation to efficiency are demonstrated. Finally the manufacture of back-contact solar cells is explored, including degradation mechanisms and possible resolutions to improve efficiency. Improving light trapping, reducing unit cell geometry and reducing external series resistance are discussed. A plan for the development of 30%-efficient concentrator cells is key within the content of this chapter.

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