| 초록 |
Here, we report an air-stable, hole-conductor-free (HCF), high photocurrent PSC based on CH3NH3PbI3-NiO nanoparticles (MAPbI3-NiO NPs) composite. The composite solution contains highly dispersed NiO NPs in solution of CH3NH3I (MAI) and PbI2 in dimethylformamide. By introducing the CH3NH3PbI3-NiO composite into the active layer, the HCF-PSCs with FTO/c-TiO2/mp-TiO2/MAPbI3-NiO/Au architecture have been fabricated under ambient conditions. Compared to the power conversion efficiency (PCE) of MAPbI3-based HCF-PSC (i.e., 5.43%), the MAPbI3-NiO NPs composite-based HCF-PSC showed a high PCE of 12.14 %. More interestingly, the composite-based HCF-PSCs without encapsulation showed remarkable air stability with retaining ~90 % of its original PCE and ~94% of both Jsc and FF for 60 days under ambient environment. XPS and IR spectra analysis revealed that Ni-O, Pb-O, C-O, Ni-N and N-NiO bonds attributed to strong chemical interaction between NiO and MAPbI3 molecules enhance the air stability of MAPbI3-NiO composite based HCF-PSCs. |
