| 초록 |
Polymer solar cells (PSCs) have received great attention due to its advantages (flexibility, light weight and low fabricating costs).[1] In this study, 6-(2-thienyl)-4H-thieno[3,2-b]indole (TTI) and isoindigo (ID) were used for conjugated polymers. Alternating and random copolymers including TTI and ID units were designed. From the UV-vis absorption spectra of the random copolymers, a significant red shift from the maximum peaks and a broader full width at half maximum (fwhm) with higher ID unit ratio can be observed. Conjugated polymers exhibited lower gap between highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels with increased percentage of ID as electron accepting groups. The device composed of PTTIID-7 and PCBM (1:2) had shown VOC, JSC and fill factor (FF) value of 0.63 V, 12.3 mA/cm2, and 0.52 respectively which gives the PCE of 4.03%. [1] Su, Y.-W; Lan, S.-C.; Wei, K.-H. Organic photovoltaics. Mater. Today, 2012, 15, 554-562. |
