| 초록 |
Three small molecules, composed of two dimensional NDT donor core and end-capped with electron deficient unit such as TPD, Ester and Amide group, defined as 2D-NDT(TPD)2, 2D-NDT(Ester)2 and 2D-NDT(Amide)2 were designed and synthesized. The optical, electrochemical, morphological and photovoltaic properties of these small molecules were characterized and investigated. When organic solar cells were fabricated using these small molecules, the morphology of 2D-NDT(Ester)2 or 2D-NDT(Amide)2 and PC71BM blend film was optimized using a DIO additive. A device based on 2D-NDT(Ester)2:PC71BM(1:1, 1% DIO) shows efficiency of 1.22% with Jsc of 3.75 mA/cm2, Voc of 0.91V and FF of 35.50. Similarly for 2D-NDT(Amide)2:PC71BM(1:3, 1% DIO) device efficiency of 0.55%, with Jsc of 2.36 mA/cm2, Voc of 0.64V and FF of 36.95 was observed. Finally for 2D-NDT(TPD)2:PC71BM(1:2) device, efficiency restricted to 0.33% with Jsc of 1.66 mA/cm2, Voc of 0.73V and FF of 27.2. |
