Abstract
Several variants in the interdigitated back contact (IBC) design have been introduced over the past several years. The front-surface-field (FSF) solar cell has a high-low junction on the front side of the IBC solar cell. The function of the front surface field is to reduce the effective front-surface recombination velocity for the carriers in the bulk of a device. Point-contact solar cells are IBC cells with a reduced emitter area and reduced metal contact area on the backside of the cell to decrease as much as possible the emitter recombination. For one-sun or low-concentration applications, the backside emitter coverage fraction can be kept at almost 100% because the dominant recombination mechanisms are Shockley-Read-Hall (SRH) and surface recombinations. In this, a simple IBC design is preferred. IBC cells are subject to efficiency degradation in the same way many other high-efficiency silicon solar cells are. If float-zone (FZ) wafers are used, the degradation will be limited to the silicon-silicon dioxide interface.
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