You can read some paper by prof. H. Bassler, if you are interested in the carrier transport (hopping) in the disordered (off- and diagonal disorder) system with a Gaussian distribution. Prof. Bassler mainly focused on the doped conducting polymers.

Here is a link to start with.

http://books.google.com.br/books?id=7LI2SNG6lt0C&printsec=frontcover&hl=pt-BR#v=onepage&q&f=false

Here is a classical "must read" book on the subject.

Thanks dear Sergei Sergeenkov for valuable books. can you send me Pdf of first book too?

Dear Kamran, unfortunately the first book is not available (even to read it online). Here is a link to a huge online library from where you can download similar books.

Best, Sergei

http://bookos.org/s/?q=Electrical+Transport+in+Semiconductors&t=0

Thanks again