709Recombination centres in luminescent crystals n-SiC(6H) doped with nitrogen and compensated with boron during the diffusion process are investigated by photocapacitance method. Boron diffusion results in appearance of a deep centre which is able to capture holes effectively. The ionization energy of this centre E , = (0.4 & 0.02) eV coincides with the boron ionization energy in p-SiC(6H) : B crystals and the spectral dependence of photoionization cross-section pp is similar to the spectral dependence of absorption near the long-wave edge of the absorption band of these crystals. But such centre is not observed in n-SiC(6H) : B original samples in spite of the large quantity of boron in them. Based on these facts the conclusion can be made that boron with respect to the capture of the holes may be either in active or in bound states depending on the method of doping. This results in different efficiency of photoluminescence of crystals doped with boron in the growth and diffusion processes. ~OTOeMKOCTHbIM MeTOHOM HCCJIenOBanHCb peIEOM6HHauHOHHbIe UeHTpbI B JIIOMHHeC-IIHPYIOIZIHX IEpHCTanJIaX n-SiC (6H), JIerHpOBaHHbIX a30TOM H HOMIIeHCMPOBaHHbIX 60-POM B npoqecce A M @ @~~E I H . J$u#@y311~ 6opa I I~H B O A H T K nomneHmo rny60~01-o qempa, ~@ @~K T H B H O ~~X B~T~I B~I O L Z I~~O AbIpm. 3~e p r m M O H M~~U M M 3~01-0 uempa ET = = (0,4 -J= 0,02) eV cosnaAaeT c a~e p r~e t H O H M~~~H H 6opa B KpMcTannax p-SiC(6H) : B Kpam nonocbi nornowemn B ~T M X me KpHcTannax. OEHaKo y~a 3 a~~u i i uemp He a ClleEtTpaJlbHaFI 3aBHCHMOCTb Ce' IeHHR @OTOkIOHH3aUHH qp n o~o 6~a AnMHHOBOJIHOBOMY Ha6nH)AaeTCH B MCXOAHbIX o6paaqax n-sic (6H): B, HeCMOTPFI Ha TO, 'IT0 B HIlX IIpM-CYTCTBYeT 60p B 6onbrunx KOJlH' IeCTBaX. Ha OCHOBaHHH 3THX @aKTOB AenaeTCFI BbIBOA, 'IT0 60p B n-SiC (6H) B 3aBHCHMOCTH OT cnoco6a JlerHpOBaHHH MOmeT HaXOnIlTbCfi B aK-THBHOM n~6 0 CBHBBHHOM COCTOEIHHFIX no OTHOUIeHMH) IE 3aXBaTy AbIPOK, YTO H 06yCmB-JIHBaeT pa3JlM' IHyIO 3@@eKTHBHOCTb @OTOJlIOMHHeCIJeHqHH KpHCTaJInOB, JIerHpOBaHHbIX 6 0~0~ B npoqecce pocTa M B npouecce A M @ @~~M M .
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