Ceramic semiconductor properties

Features:

Iyo resistivity yekeramics ine semiconductor properties inenge 10-5 ~ 107ω.cm, uye semiconductor zvinhu zveceramic zvinhu zvinogona kuwanikwa ne doping kana kukonzera kukanganisa kwelatisi kunokonzerwa nekutsauka kwe stoichiometric. Ceramics inoshandisa nzira iyi inosanganisira TiO2,

ZnO, CdS, BaTiO3, Fe2O3, Cr2O3 uye SiC. Hunhu hwakasiyana hwesemiconductor ceramicsndezvekuti maitiro avo emagetsi anoshanduka nemamiriro ekunze, ayo anogona kushandiswa kugadzira mhando dzakasiyana dzeceramic sensitive madivayiri.

Zvakadai sekunzwa kupisa, gasi rinonzwa, humidity sensitive, pressure sensitive, light sensitive uye mamwe masensor. Semiconductor spinel zvinhu, zvakadai seFe3O4, zvinosanganiswa ne-non-conductor spinel materials, zvakadai seMgAl2O4, mukugadzirisa kwakasimba mhinduro.

MgCr2O4, uye Zr2TiO4, inogona kushandiswa sezvidziviriro, izvo zvinonyatsodzorwa zvinodzivirira zvinosiyana nekupisa. ZnO inogona kugadziridzwa nekuwedzera maokisi akadai seBi, Mn, Co uye Cr.

Mazhinji emaokisi aya haana kunyungudika zvakasimba muZnO, asi kutsauswa pamuganhu wezviyo kuti aite barrier layer, kuitira kuti awane ZnO varistor ceramic materials, uye imhando yezvinhu zvine basa rakanakisa muvaristor ceramics.

SiC doping (yakadai seyemunhu kabhoni dema, graphite poda) inogona kugadzirirasemiconductor zvinhuine yakanyanya kugadzikana tembiricha, inoshandiswa seyakasiyana siyana yekudziya kupisa zvinhu, kureva, silicon kabhoni tsvimbo mune yakakwirira tembiricha yemagetsi mavira. Dzora iyo resistivity uye muchinjiko chikamu cheSiC kuti uwane chero chinhu chaunoda

Mamiriro ekushanda (kusvika ku1500 ° C), kuwedzera kwayo resistivity uye kuderedza chikamu chemuchinjikwa wechinhu chinopisa chichawedzera kupisa kunogadzirwa. Silicon carbon tsvimbo mumhepo ichaitika oxidation reaction, kushandiswa kwekushisa kunowanzo kugumira ku1600 ° C pazasi, iyo yakajairika mhando yesilicon kabhoni tsvimbo.

Iyo yakachengeteka tembiricha yekushandisa i1350°C. MuSiC, atomu yeSi inotsiviwa neatomu yeN, nokuti N ine maerekitironi akawanda, kune maerekitironi akawandisa, uye simba rayo riri pedyo nechepasi conduction bhendi uye zviri nyore kusimudza kune conduction bhendi, saka iyi simba inonziwo donor level, iyi hafu

Iwo maconductor ari N-mhando semiconductors kana zvemagetsi kuita semiconductors. Kana atomu yeAl ikashandiswa muSiC kutsiva atomu yeSi, nekuda kwekushaikwa kweerekitironi, iyo yakaumbwa simba renyika iri padyo nebhendi remagetsi revalence riri pamusoro, zviri nyore kubvuma maerekitironi, uye nekudaro inonzi inobvuma.

Iyo huru yesimba nhanho, iyo inosiya nzvimbo isina munhu mubhendi yevalence inogona kuitisa maerekitironi nekuti nzvimbo isina munhu inoita zvakafanana neyechaji inotakura zvakanaka, inonzi P-type semiconductor kana buri semiconductor (H. Sarman,1989).