High effective minority carrier lifetime on silicon substrates using quinhydrone-methanol passivation

Bhumika Chhabra, Stuart Bowden, Robert L. Opila, Christiana Honsberg

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

Iodine-methanol (I2 /ME), a chemical passivation method, is extensively used in silicon (Si) solar cell fabrication for measuring minority carrier lifetime in bulk regions. We demonstrate that quinhydrone-methanol (QHY/ME) provides higher lifetimes than I2 /ME. For 0.01 mol/ dm-3 QHY/ME on float-zone (FZ) wafers at 1× 1015 cm-3 injection level, a high lifetime of 3.3 ms and surface recombination velocity of 7 cm/sec on n-type (100 Ω cm) and 1.1 ms on p-type (2 Ω cm) is reported. The surface recombination velocity is also measured out of solution for several days. Chemical characterization results indicate increasing surface oxidation with decreasing passivation, consistent with proposed bonding mechanism.

Original languageEnglish (US)
Article number063502
JournalApplied Physics Letters
Volume96
Issue number6
DOIs
StatePublished - 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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