Thin silicon solar cells: Pathway to cost-effective and defect-tolerant cell design

André Augusto, Erin Looney, Carlos Del Cañizo, Stuart Bowden, Tonio Buonassisi

Research output: Contribution to journalConference articlepeer-review

15 Scopus citations

Abstract

Thinner silicon wafers are a pathway to lower cost without compromising the efficiency of solar cells. In this work, we study the recombination mechanism for thin and thick silicon heterojunction solar cells, and we discuss the potential of using more defective material to manufacture high performance thin solar cells. Modelling the performance of silicon heterojunction solar cells indicates that at open-circuit voltage the recombination is dominated by Auger and surface, representing nearly 90% of the total recombination. At maximum power point, the surface is responsible for 50 to 80% of the overall recombination, and its contribution increases inversely with the wafer thickness. The experimental results show that for lower quality CZ material with 1 ms bulk lifetime, 60 μm-thick cells perform better than 170 μm-thick cells. The potential efficiency gain is 1% absolute. The gains in voltage of using thinner wafers are significantly higher for the lower quality CZ material, 25 mV, than for standard CZ material, 10 mV.

Original languageEnglish (US)
Pages (from-to)706-711
Number of pages6
JournalEnergy Procedia
Volume124
DOIs
StatePublished - 2017
Event7th International Conference on Silicon Photovoltaics, SiliconPV 2017 - Freiburg, Germany
Duration: Apr 3 2017Apr 5 2017

Keywords

  • Thin silicon
  • defect
  • heterojunction
  • solar cells

ASJC Scopus subject areas

  • Energy(all)

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