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High‐Efficiency Interdigitated Back Contact Silicon Solar Cells with Front Floating Emitter
摘要： Silicon interdigitated back contact (IBC) solar cells with front floating emitter (FFE-IBC) put forward a new carrier transport concept of “pumping effect” for minority carriers compared with traditional IBC solar cells with front surface field (FSF-IBC). Herein, high-performance FFE-IBC solar cells are achieved theoretically combining superior crystalline silicon quality, front surface passivation, and shallow groove structure using 2D device model. The improvement of minority carrier transport capacity is realized in the conductive FFE layer through optimizing the doping concentration and junction depth. It is shown that the shallow groove on the rear side of FFE-IBC solar cells can effectively enhance the carrier collection ability by means of minimizing the negative impact of undiffused gap or surface p–n junction. The high efficiency exceeding 25% can be realized on silicon FFE-IBC solar cells with the novel cell structure and optimized cell parameters, where the back surface field and emitter region width can be made for the same with only a slight sacrifice of photocurrent density and conversion efficiency. It is demonstrated theoretically that the realization of high-efficiency and low-cost silicon IBC solar cells is feasible due to the increase of the module fabrication tolerance.
关键词： shallow grooves,numerical simulations,high performance,front floating emitters,silicon interdigitated back contact solar cells
更新于2025-09-19 17:13:59
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AIP Conference Proceedings [AIP Publishing 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Fes, Morocco (25–27 March 2019)] 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Woven multi-ribbon interconnection for back-contact cells: Extending the functionality of the encapsulant
摘要： Back-contact solar cells have shown their potential in the past, with record efficiencies approaching the theoretical maximum value. In parallel, industry-relevant fabrication methods of efficient cells are being developed. Next to this increased power yield, the absence of frontside metallization on the cells greatly improves their aesthetics. The main challenge to manufacture modules using back-contact cells is finding a cost-effective method to electrically interconnect them. In this work, we introduce a novel way of doing so. The interconnection concept is based on a fabric with interwoven metal interconnection ribbons and polymer encapsulant ribbons. It has the advantage of optimized material consumption, low manufacturing cost and low manufacturing temperatures, which lowers the induced thermo-mechanical stress. First proof-of-concept single cell modules have been fabricated and have shown to pass 200 thermal cycles (-40 oC to 85 oC) with no decrease in performance. These reliability tests prove the potential of the concept.
关键词： back-contact solar cells,woven fabric,encapsulant,interconnection,reliability testing
更新于2025-09-11 14:15:04