What about Phys. Rev. B? Can't be wrong..

Yes it is very good for mostly core theoretical base research. Apart from this Nanoletter and Small is very good journal for the aforesaid subject query.

Also, how about J. Appl. Phys. (if some aplication is intended) or J. Appl. Cryst. (deals a lot with crystalline materials, and in particular also single crystalline or epitaxial samples)

I am not into the field I mention hereafter, but there are people working on III-V materials (thin layers, epitaxial, so quasi-perfect i.e. could be assimilated to single crystalline) for optoelectronics applications; it seems to me they do publish in specialized journals and attend rather specific conferences related to the subject. It happened that I did some studies in collaboration with such a person, you can look at the profile and the publication list of J. Decobert - hopefully you'll find there some meaningful information as answer for your question