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

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

doi:10.1063/1.3309595

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 journal › Article › peer-review

55 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 language	English (US)
Article number	063502
Journal	Applied Physics Letters
Volume	96
Issue number	6
DOIs	https://doi.org/10.1063/1.3309595
State	Published - 2010

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "High effective minority carrier lifetime on silicon substrates using quinhydrone-methanol passivation",

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.",

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T1 - High effective minority carrier lifetime on silicon substrates using quinhydrone-methanol passivation

AU - Chhabra, Bhumika

AU - Bowden, Stuart

AU - Opila, Robert L.

AU - Honsberg, Christiana

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

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

Abstract

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