2h^s 2^2 la nang lupng lien ket cua exciton.
1.5.2 Cac phuong phap che tao mang dung dich ran
ạ Boc bay trong chan khdng: Phuang phap bdc bay vat lieu trong chan khdng
rdi cho lang dpng len de la phuong phap phd bien nhit d l thu nhan mang mong ban din. D l nhan dupe mang dung dich ran ban dan thi vat lieu bdc bay cd thi chinh la dung dich ran hoac cac hpp chit ban din thanh phan cua dung dich. Su bdc bay vat lieu xay ra dudi tic dung ciia nhiet dp. Nhiet dp bdc bay phu thupc vao thanh phan dung dich rin. Hau bet cac dung dich ran A B deu cd thi nhan bang phuang phip naỵ
b. Lang dpng hoa hpc tilt pha hai: Hoi cua hop chit ban dan thanh phan dupe
ling. Oxy hoac hoi nude ciing dupe nen vao budng đ. Tai đ hoi dupe phin bd deu va lang dpng I6n dl^ ndng. Phuang phip nay d l thuc hien va tiet kiem. Nhí6u tic gia
da su dung phuang phap nay di ch^ tao mang SnOs [64] va Zn^Cdi^^S [48].
c. Phuang phap phun ion: Chum ion dupe tao ra bdi ngudn plasmatron kep, sau
khi hoi tu, dupe chieu vao budng ling dpng trong do ap suit rit thip (10'^ - 10'^ pa). Chiim ion bin vao cac bia vat lieụ Vat lidu se dupe phun ra tii 8 bia đ len 20 de ndng. Cac bia vat lieu va cac d^ deu dupe quay trong budng ling dpng [64]. Bang phuang phip nay da tao ra chuyen ti6p p-n tren dung dich ran Zn^Cd^^Te [35].
d. Phuang phap phun dung dich: Phuong phap nay do Chamberlin de xudng
nam 1963 va hoan thien vdi ket qua phun mang CdS [45]. Bang phuang phap nay,dung dich mudi cd chiia thanh phan cua hpp chit ban dan dupe phun len de ndng va ling dpng tai đ thanh mang dung dich ran ban din. Thanh phan cua mang d l dang thay đi va dupe xac dinh bdi tuong quan giiia cac thanh phan hpp chit tdn tai trong dung dich . Khf nen dung d l tao ap suit d diu vdi phun dung dich thudng la khdng khf hoac khf trạ Phuang phap nay la phuang phap cd gia thanh re nhat va Cling de dang thuc hidn nhat. Ddng thdi phuong phap nay cho phep phun cac mang vdi difn tfch rpng, cd dp đng deu caọ Nhieu mang ban din A B da dupe phun bang phuang phap nay nhu: ZnO [81], CdTe [62,36], ZnS [53], CdSe [54], CdS [46]. Cac mang dung dich ran A " B ^ nhu CdS^Sej., [76] va Zn^Cd^xS [70,74] ciing dupe che tao bing phuong phap naỵ Ngoai ra mang dung dich ran ban din con dupe che tao bang phuang phap khac nhu bdc bay nd, thang hoa, ling dpng hda hpc, phiin xa catdt...