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Cu2ZnMS4-x (M: Al, Ga, In) nanocrystals are prepared by the colloidal hot-injection method starting with thermal decomposition of a 2:1:1 molar mixture of Cu(acac)2, Zn(acac)2, and M(acac)3 in oleylamine under N2 (Schlenk line, 150 °C) followed by quickly injecting a mixture of n-dodecanethiol and tert-dodecanethiol and subsequent heating (250 °C, 1 h), with the latter leading to a structural transition from the wurtzite to the stannite phase. [ABSTRACT FROM AUTHOR]