Patent ID: 7033435

Claim:
A process for preparing a p-n junction having a p-type ZnO film and an n-type film wherein a net acceptor concentration is at least about 10 15 acceptors/cm 3 , the process comprising: cleaning a substrate; adjusting the temperature of the substrate in a the pulsed laser deposition chamber to between about 200° C. to about 1000° C.; growing a p-type ZnO film on the substrate by directing an excimer pulsed laser beam onto a pressed ZnO powder pellet containing a p-type dopant element to grow a p-type ZnO film containing at least about 10 15 10 18 acceptors/cm 3 on the substrate; and growing an n-type film on top of the p-type ZnO film by directing an excimer pulsed laser beam onto a pressed powder pellet containing an n-type dopant element to grow an n-type film on the p-type ZnO film on the substrate.