| Perovskite solar cells(PSCs)are a successful case that can realize the direct conversion of light to electricity.Insufficient open circuit voltage(Voc),fill factor(FF)loss,and current-voltage hysteresis still limit the photoelectric performance of PSCs.In order to overcome these limitations and obtain higher device performance,a lot of researchs are being carried out to passivate defects or modulate energy levels at the perovskite/ETL or HTL interface.Most of the researches focus on the modification strategy of perovskite/ETL,and there are relatively few studies on the modification of the perovskite/HTL interface.This work provides two effective methods for interface modification by solution spin coating,usingtwoexcellentsmallmoleculematerials,tetraphenyldibenzocyclopentadiene(DBP)and tetracene(Tetracene)as the intermediate layer to modify the perovskite/HTL interface,optimize the energy level arrangement,and improve the performance of perovskite solar cells by reducing non-radiative recombination at the interface and improving hole extraction.The interface modification treatment between perovskite-HTL is carried out with different concentrations of DBP solution,and the device with 1.102V Voc,23.66 m A/cm~2 Jsc,80%FF,and 20.6%PCE can be obtained.The interface is modified between perovskite-HTL with different concentrations of Tetracene solutions,and the device with 1.110V Voc,23.09 m A/cm~2 Jsc,80%FF,and 20.44%PCE can be obtained.It is proved by TRPL that the DBP-modified device significantly accelerates the hole extraction ability,and the passivation effect of Tetracene can effectively inhibit the non-radiative recombination of the interface caused by defects,and significantly improve the current-voltage hysteresis effect of the device and the hydrophobicity of the film surface and the stability of the device also.These results also show that both Tetracene and DBP are excellent perovskite interface modification materials. |
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