| dc.description.abstract | The interface defects between perovskite absorber and hole transport layer (HTL) of perovskite solar cells (PSCs) will cause electrons and holes recombination, decreasing the power conversion efficiency and long-term stability of PSCs. In this study, non-fullerene small molecules (TIIQ-b16 and DPPQ-b16) were used as additives for perovskite precursor solutions and the resulting perovskite films were called T-PSK and D-PSK, respectively. Furthermore, when PDTON was used as an additive of antisolvent (CB) to crystallize perovskite films, the resulting films were called T-PSK@PD and D-PSK@PD. The perovskite film prepared without any additive was called PSK. FT-IR transmission spectra indicate that the cyano absorption peaks of TIIQ-b16 and DPPQ-b16 have a shift 10 cm⁻¹ and 8 cm⁻¹ to lower wavenumbers respectively when they were mixed with PbI₂, suggesting a coordination interaction between the lone pair electrons on the cyano groups and the unsaturated Pb²⁺ sites in perovskite film. SEM images show that T-PSK@PD is the smoothest film with the largest grains. PL intensity and XRD data suggested that T-PSK@PD is the best quality film. TRPL curve also show that Spiro-OMeTAD-coated on PSK-TD film has the shortest exciton half-life, these data reveal that perovskite film prepared with TIIQ-b16 (in precursor solution) and PDTON (in anti-solvent) additives has the highest quality. Devices based on PSK, T-PSK, D-PSK, T-PSK@PD, and D-PSK@PD absorbers achieve the maximum PCEs of 20.89%, 21.39%, 21.23%, 22.01%, and 21.70% respectively. Devices using T-PSK@PD and D-PSK@PD as the absorption layers maintained 95% and 94%, respectively of their initial efficiency after 1920 hours of storing in a glove box without encapsulation, while device used PSK as absorber retained only 82% of their initial efficiency under the same conditions, while device used T-PSK and D-PSK as the absorber retained 95% and 93%, respectively of their initial efficiency after 960 hours | en_US |