| 초록 |
In this study, we developed two isomeric lactam acceptors, thieno[3,2-c]quinolin-4(5H)-one (TQO) and thieno[3,2-c]isoquinolin-5(4H)-one (TIQO), to compare the their optical and electrochemical properties. The wide bandgap D-A type polymers, PBDT-TQO and PBDT-TIQO, were synthesized using the BDT with TQO or TIQO for fullerene and non-fullerene organic solar cells. Polymers showed absorption range below 600 nm and low-lying highest occupied molecular orbital energy levels. The appropriate match of the energy levels between donors and acceptors could be applied for fullerene and non-fullerene OSC. PCEs of the fullerene based devices achieved 3.02 % for PBDT-TQO:PC71BM and 3.92 % for PBDT-TIQO:PC71BM, respectively. For better photovoltaic performances, the devices based on polymer:non-fullerene acceptor (ITIC or IT-4F) were fabricated. A PCE of device for PBDT-TQO:IT-4F achieved 7.62 %, while the device for PBDT-TIQO:ITIC was afforded PCE of 6.56 % thanks to increase Jsc and Voc. |
