Sorry, I do not make transistors. Instead I simply select ones that are already made and use them in circuits that I have designed properly.
None of my many transistor circuits had any proplems caused by icbo or iceo.
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I noticed that this OP called p11 has posted many threads about the very basics of transistors. It is like he is reading a book and looking only at the titles of chapters then is asking questions about them.
Remember Walters (aka Billy Mayo, Danny Davis, Castillovanv, Vancastillo, PrescottDan, davewalker, and haroldbrown)? Him and all these aliases have been banned here and on other electronics forums.