مشخصات پژوهش

Wrapped poly[bis(triiso-propylsilylethynyl) benzodithiophene-bis(decyltetradecyl-thien) naphthobisthiadiazole] (PBDT-TIPS-DTNT-DT)/graphene quantum dot (GQD) and wrapped PBDT-TIPS-DTNT-DT/carbon quantum dot (CQD) supramolecules were constructed and employed in active layers of CH3NH3PbI3 perovskite solar cells. Mission of this research was to reach the most modified and stabilized CH3NH3PbI3 solar cells and it was realized through wrapped/ QD supramolecules. Although the function of pure perovskite devices was acceptable upon fabrication (10.79%), they lost their performance during longterm air exposure (0.00%). The QDs, before being wrapped by conjugated chains, were not capable of doing well. However, upon-constructed wrapped PBDT-TIPS-DTNT-DT/CQD and wrapped PBDT-TIPS-DTNT-DT/GQD devices manifested the best photovoltaic results (19.20 and 20.13 mA/cm2, 72% and 73%, 0.94 and 0.94 V and 12.99% and 13.81%). About 150 d of exposure to air at 30
C and 35% humidity had the lowest influence on wrapped/QD systems and perovskite crystal sizes of 264 and 255 nm were reached in wrapped/GQD and wrapped/CQD films, respectively. Arrangement of PBDT-TIPS-DTNT-DT conjugated chains onto either flat (GQD) or quasi-spherical (CQD) nanoparticles resulted in inducing a higher degree of crystallinity and also enhancing the perovskite crystal sizes. Efficacies of perovskite + wrapped PBDT-TIPS-DTNTDT/GQD and perovskite + wrapped PBDT-TIPS-DTNT-DT/CQD photovoltaics were maintained in 5.73% (14.05 mA/cm2, 60%, and 0.68 V) and 3.93% (11.53 mA/cm2, 55%, and 0.62 V), respectively, after 150 d air exposure. Indeed, wrapped PBDT-TIPS-DTNT-DT/QD supramolecules slowed down the decrement of photovoltaic characteristics during aging via appropriate interactions between additives and host precursors.