2D/3D Simulations of Black-Silicon Interdigitated Back-Contacted c-Si(n) Solar Cells

Eric Calle, I. Carrío, Pablo Ortega, Guillaume von Gastrow, Hele Savin, I. Martín , Ramon Alcubilla

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific


Black silicon (b-Si) reduces drastically light reflectance in the front side of c-Si solar cells to values near zero for the whole absorbed solar spectrum. In this work, we apply 2D and 3D simulations to explore the efficiency limits of interdigitated back-contacted c-Si(n) solar cells with line or point contacts respectively, using ALD Al2O3 passivated b-Si in the front surface. Realistic physical and technological parameters involved in a conventional oven-based fabrication process are considered in the simulations, especially those related to surface recombination on the b-Si as well as high doped p+/n+ strip regions. One important issue is the temporal stability of surface passivation on b-Si surfaces. In this work experimental long-term b-Si surface passivation data after two years and its impact on cell performance are studied. Simulations demonstrate initial and final photovoltaic efficiencies over 24.6% and 23.2% respectively for an emitter coverage of 80% independently of the cell contact strategy. A photocurrent loss about 1.3 mA/cm2 occurs when surface recombination velocity at the b-Si surfaces degrades from 6 cm/s to a final value of 28 cm/s.
Original languageEnglish
Title of host publicationProceedings of the 33rd European Photovoltaic Solar Energy Conference and Exhibition
Subtitle of host publicationEU PVSEC 2017
PublisherEU PVSEC
Pages857 - 860
ISBN (Electronic)3-936338-47-7
Publication statusPublished - 2017
MoE publication typeB3 Non-refereed article in conference proceedings
EventEuropean Photovoltaic Solar Energy Conference and Exhibition - Amsterdam, Netherlands
Duration: 25 Sep 201729 Sep 2017
Conference number: 33


ConferenceEuropean Photovoltaic Solar Energy Conference and Exhibition
Abbreviated titleEU PVSEC


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