Research On Binary And Ternary Polymer Solar Cells Based On PIDTDTQx

the world’s development, human progress cannot do without energy, polymer solar cells as a potential renewable energy have attracted more and more attention with many advantages, including light weight, environmental protection, low consumption, easy fabrication, flexibility and so on. By changing the structure of polymer solar cells, adding solvent additives in the preparation process of device performance, the use of ethanol treatment methods can improve the active layer of organic solar cell. This paper studies the effect of a polymer material PIDTDTQx in the ternary blend polymer solar cells and play the role of morphology control as the active layer of the device performance for PIDTDTQx:PC7iBM.Solvent additive DIO is not almighty for improving performance of polymer solar cells (PSCs). In this paper, the effect of solvent additive DIO and ethanol treatment on the performance of PSCs with PIDTDTQx and PC71BM as the active layer was investigated. The power conversion efficiency(PCE) was decreased from4.57%to1.96%by adding4vol%DIO solvent additive for the active layer processed with1,2-dichlorobenzene (DCB) as solvent. The negative effect of DIO on PCE from1.94%to1.18%of PSCs processed with chlorobenzene (CB) as solvent was further demonstrated. The PCE values of PSCs with DIO additive can be effectively increased from1.96%to3.71%for DCB as solvent and from1.18%to1.89%for CB as solvent by ethanol treatment on the active layer. The crystalline and morphology of active layers play the key role in determining the performance of PSCs.A series of P3HT:PC7iBM PSCs with different PIDTDTQx doping concentrations were fabricated to investigate the effect of the PIDTDTQx as a complementary electron donor on the performance of PSCs. The PCE of the optimized ternary blend PSCs (with2wt%PIDTDTQx) reached3.87%, which is28%higher than that of the PSCs based on P3HT:PC7iBM (control cells). The short-circuit current density (Jsc) was increased to10.20mA/cm2compared with the control cells. The PCE improvement could be attributed to more photon harvest and charge carrier transport by appropriate doping PIDTDTQx. The energy transfer from P3HT to PIDTDTQx was demonstrated from the650-nm emission intensity decrease and the red-shifted emission peaks from725nm to737nm along with the increase of PIDTDTQx doping concentrations.