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.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)