As I mentioned in my answer to Producing my own energy options in urban area with windows but no roof access? photo-voltaic double glazing - a form of Building-integrated photovoltaics (BIPV) may become more popular in the future as the economics of scale improves for low efficiency thin film PV.
Low cost thin film PV has the potential to be substantially cheaper than using crystalline silicon cells, but since it generally has a lower efficiency it isn't as interesting. For windows though, low efficiency has its advantages. Since thin films are layered on top of transparent glass, any light not converted into electricity passes through. Many glass fronted buildings already attenuate the incident light anyway, to minimise air-conditioning costs or reduce glare, so converting that light into energy rather then turning it into heat or reflecting it out of the building has a certain appeal.
I don't know of anyone producing home double glazing units featuring BIPV modules yet, but I know that machines for creating the glass panels for large scale BIPV projects have been around for years (I used to work on them in the mid to late naughties).
It is certainly an area I will be keeping an eye on, as the idea of unclipping my existing double glazing units and clipping in replacement double glazing units with integrated PV holds a lot of appear for me personally.
I can't suggest any specific suppliers† but the important thing is the term BIPV, which should allow you to search out current suppliers.
†Even if I knew that information (which I don't, I worked at the B2B end of the industry) that side of the question is a poor fit for stack exchange as the information goes out of date too quickly, so is unlikely to benefit future visitors. For more information, see Q&A is Hard, Let’s Go Shopping!.