Here's a list with research groups and institutions in photovoltaics: http://www.google.co.uk/#hl=en&expIds=25657,27026,27031,27033,27040,27817&xhr=t&q=photovoltaics+research&cp=15&pf=p&sclient=psy&aq=0&aqi=g4g-o1&aql=&oq=&gs_rfai=&pbx=1&fp=ec580a23bbcb13e1
perhaps it's worth informing with the scientists whether they have positions etc?