biostudies-literatureChen LChongqing Science and Technology CommissionNational Natural Science Foundation of ChinaChongqing Municipal Education Commission15961-15966https://www.ebi.ac.uk/biostudies/studies/S-EPMC9080180biostudies-literatureUnknown8(29)As a thin cathode buffer layer (CBL) tris-(8-hydroxyquinoline), aluminum (Alq<sub>3</sub>) is successfully introduced into the planar p-i-n perovskite solar cells (PSC) between the PCBM layer and cathode with a device structure of ITO/PEDOT:PSS/CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>(Cl)/PCBM/Alq<sub>3</sub>/Ag. Due to the as-introduced thin Alq<sub>3</sub> CBL, a high performance planar PSC has been achieved with a fill factor (FF) of 72% and maximum power conversion efficiency (PCE) of 14.22%. The PCE value is approximately 29% higher than that of the reference device without Alq<sub>3</sub> CBL. Concerning the results of AC impedance spectra and transient photocurrent measurements, such a remarkable improvement of PCE is mainly attributed to the Alq<sub>3</sub>-caused better charge-RSC advancesHigh performance planar p-i-n perovskite solar cells based on a thin Alq<sub>3</sub> cathode buffer layer.PMC9080180KJ160032711504036KJ1500318CSTC2015jcyjBX003211274256CSTC2017jcyjAX033311774293Guan YYao YCui YChen LSong QWang GNiu LfalseHigh performance planar p-i-n perovskite solar cells based on a thin Alq<sub>3</sub> cathode buffer layer.As a thin cathode buffer layer (CBL) tris-(8-hydroxyquinoline), aluminum (Alq<sub>3</sub>) is successfully introduced into the planar p-i-n perovskite solar cells (PSC) between the PCBM layer and cathode with a device structure of ITO/PEDOT:PSS/CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>(Cl)/PCBM/Alq<sub>3</sub>/Ag. Due to the as-introduced thin Alq<sub>3</sub> CBL, a high performance planar PSC has been achieved with a fill factor (FF) of 72% and maximum power conversion efficiency (PCE) of 14.22%. The PCE value is approximately 29% higher than that of the reference device without Alq<sub>3</sub> CBL. Concerning the results of AC impedance spectra and transient photocurrent measurements, such a remarkable improvement of PCE is mainly attributed to the Alq<sub>3</sub>-caused better charge-2018-01-01T00:00:00Z2018 Apr2025-04-26T04:35:51.258Z2025-04-06T11:14:35.135ZS-EPMC90801803554221410.1039/c8ra01633j