EFFECT OF THIOPHENE,3-HEXYLTHIOPHENE,SELEPHENE,AND THIENO(3,2-B)THIOPHENE SPACERS ON OPV DEVICE PERFORMANCE OF NOVEL 2,1,3 BENZOTHIADIAZOLE BASED ALTERNATİN COPOLYMERSJournal of Electroanalytical ChemistryMakaleAli ÇIRPAN / Cansu Zeytun Karaman / Erol Yıldırım / Gonul Hizalan / Levent TOPPARE / Serife O. Hacioglu / Seza Göker / Sultan Taşkaya Aslan / Tuğba Hacıefendioğlu / Ümmügülsüm ŞahinEFFECT OF THIOPHENE,3-HEXYLTHIOPHENE,SELEPHENE,AND THIENO(3,2-B)THIOPHENE SPACERS ON OPV DEVICE PERFORMANCE OF NOVEL 2,1,3 BENZOTHIADIAZOLE BASED ALTERNATİN COPOLYMERS