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BO GIAO DUG VA OAO TAO DAI HOC QUOC GIA HA N O I TRLTCJNG DAI HOC KHOA HOC TlTNHIEN -oOo- Le Thi Thanh Birth Che tao va nghien cihi mot so tinh chat cua cac mang mong ban dSn dung dich ran A B Chuyen nganh: Vat ly Dien tijf J LUAN AN PHO TIEN SI KHOA HOC TOAN - LY NGUdl HU^6NG DAN KHOA HOC l.GSPTSLeKhacBinh PGS PTS Nguyen Ngoc Long O C r O N ' - '-:••:)'• MAf.OI; HA NOI -1996 MUC LUC Mord^u Chirang CAC HOP CHAT BAN DAN ZnS, CdS vA CAC DUNG DICH RAN BAN DAN Zn,Cd,.,S 1.1 Cft'u true dnh thi cua ZnS va CdS 5 1.1.1 CS^u tnic mang lap phuong gia kem 1.1.2 C^u tnic mang luc gidc Wurtzite 1.1.3 Mang tinh the ZnS va CdS 1.2 Ca'u tnic vising nSng lupng cua ZnS va CdS 10 1.2.1 Ca'u tnic viing nang lupng ciia mang I^p phuong 1.2.2 Ca'u true virng nang lupng cua mang luc giac Wurtzite 1.2.3 Viing nang lupng cua ZnS va CdS 1.3 Tinh ch^t h^p thu ciia ban dSn 1.3.1 Khai niem chung 1.3.2 Ha'p thu chuyin ddi thang 1.3.3 Ha'p thu chuyin ddi nghieng 1.4 Cac cach^'phat huynh quang ban dan 1.4.1 1.4.2 1.4.3 1.4.4 1.4.5 1.4.6 Khai niem chung Mo hinh tpa dp cau hinh Tai hop viing - viing Tai hop buc xa qua cac trang thai exciton Chuyin ddi vung - tap ch^t Chuyin ddi done - axepto 1.5 Mdt s6 phuong phap ch^'tao tinh thi va mang dung dich thi 1.5.1 Cdc phuong phap klo dan tinh the 1.5.2 Cac phuong phap che tao mang dung dich ran 10 12 13 15 15 17 18 20 20 21 25 28 33 35 37 37 38 1.6 T6ng quan v^ dung dich ran Zn^^Cdi.j^S 39 1.7 K6t luan 41 Chirang KY THUAT THl/C NGHIEM 43 2.1 He tao mang 43 2.1.1 L6 2.1.2 Bpgamau 2.1.3 He thdng vdi phun, nen 44 44 45 2.2 Ha bdc bay chan kh6ng 45 2.2.1 Bom chan khdng 2.2.2 Buong hoc bay 2.2.3 Ngudn bdc bay 2.2.4 D^bdc bay 45 45 47 47 2.3 H e phd huynh quang va phd truyen qua 47 2.3.1 H e phd huynh quang 2.3.2 H e ph6 truyen qua 2.3.3 Cac phep khac 47 50 51 2.4 K ^ luan Chuong3 CHE TAO VA NGHIEN 51 CLTU CAU TRUC CUA M A N G Zn^Cd,.,S 53 3.1 Tao mang Zn^^Cdj.^S bang phuong phap phun dung dich len de'ndng 53 3.2 Anh hudng cua nhiet dd d^d^n ch^t lupng m^ng 55 3.3 Ch^d6 u mang 60 3.4 Che^dOphatap 61 3.4.1 Phuong phap nhiing mang vao dung dich mudi tapcha'trdi ii d nhiet dp cao 61 3.4.2 Phuong phap hda dung dich mudi tap chat cung vao dung dich phun nen 63 3.5 Tao dien cue sudt Sn02 va l^m dien cue ohmic len mang Zn^^Cdi.^^S 66 3.6 Che'tao mau Zn^Cd^.^S bang phuong phap diing Id vi song 68 3.7 Ph6 nhilu xa tia X ciia mtlng Zn^Cdi.,S 70 3.8 Anh bfe mat cac mang Zn^Cd^^^S chup bang kinh hiln vi dien tu 73 3.9 K a luan 75 Chirang TINH CHAT QUANG vA HUYNH QUANG CUA M A N G Zn.Cdi KHONG PHA TAP ,S 78 4.1 Tfnh cha't quang cua mang Zn^Cd].xS 78 4.1.1 Ph6 hSp thu cua mang Zn.Cdi.^S 4.1.2 X^c dinh d6 r6ng viing ca'm cua cac mang Zn^^Cdi.^S 4.2 Huynh quang ciia cdc mang Zn^Cdi.^S khdng pha tap 78 80 82 4.2.1 Dang phd huynh quang 4.2.2 Su phu thudc ciia dinh ph6 huynh quang theo phan x 4.2.3 Pho huynh quang phan giai thai gian, su phu thupc ciia huynh quang v^o cudng dd kich thich Thdi gian sdng huynh quang 4.2.4 Anh hudng ciia che'dd li nhiet len huynh quang ciia mang Zn^Cdj.^S 4.2.5 Su phu thudc nhiet dd cua ph6 huynh quang cua cac mang Zn^Cdj.^S 83 86 87 91 92 4.2.6 Co che' biic xa cap dono - axepto phd huynh quang cua mang Zn^Cdi.^S khdng pha tap 4.2.7 Hien tupng quang hda ciia mang Zn^Cd,,^S 4.3 K^ luan 94 99 105 Chirang HUYNH QUANG CUA CAC M A N G ZnxCd,.xS PHA TAP Cu VA Mn 106 5.1 Phd huynh quang ciia m ^ g Zn^Cdi^^S : Cu 5.1.1 Dang huynh quang Anh hudng cua sir pha lap ddng len huynh quang 5.1.2 Ph6 huynh quang cua mang Zn^Cdj ^SiCu vdi cac thdng sd phan x khac = 5.1.3 Ph6 huynh quang cua mang Zn^^Cdi.^S : Cu kich thfch lien tuc vdi cac cudng dp khac va a cac nhiel khac 5.1.4 Ca che' biic xa ciia dai sdng dai phd huynh quang cua mang Zn^Cd,.^S:Cu 5.1.5 Tach ph6 huynh quang 5.2 Phd huynh quang ciia mang Zn^Cdi^^S : Mn 5.2.1 Dang phd huynh quang Anh hudng ciia su pha tap len ph6 huynh quang 5.2.2 Pho huynh quang ciia mang Zn^Cdi.^S : Mn vdi cac thong sd phan x khac 5.2.3 Sir phu ihupc cudng dp kich thfch va nhiet dp cua 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