A follow-up investigation: Organic solar cells based on chalcogenophene- Thieno[3,4-c]pyrrole-4,6-dione-chalcogenophene containing random conjugated polymersJournal of Electroanalytical ChemistryPaperAli ÇIRPAN / Eda Alemdar / Levent TOPPARE / Mustafa YasaA follow-up investigation: Organic solar cells based on chalcogenophene- Thieno[3,4-c]pyrrole-4,6-dione-chalcogenophene containing random conjugated polymers