Hi , I didn't know how to write it properly in the title. I have a problem. The BJTs I use, have very very small beta (think about 1) which destroys my results. I want to use them in a bandgap reference. So when I connect in parallel 8 BJTs nothing happens in the bandgap core.

I want to know if there is a possibility to create npn or pnp transistors by myself, without using the technology's models so as to get a good beta. I know it is difficult, I just want some info. I've heard I can not create pnp. I think I can just make npn, with the use of epitaxial layer and a deep n well..something like that. This is not clear to my mind, can somebody help? where can I get some more info?

thank you

 

We still don't know what you're trying to accomplish. These other LEDs, did you make them too?

Context is important in this case. Transistors are cheap, after all. What kind of setup are you using to make them, and how are you connecting the wires (a subject I know something about).