20.500.12556/RUL-169254 Correlation of band bending and ionic losses in 1.68 eV wide band gap perovskite solar cells Perovskite solar cells (PSCs) are promising for high-efficiency tandem applications, but their long-term stability, particularly due to ion migration, remains a challenge. Despite progress in stabilizing PSCs, they still fall short compared to mature technologies like silicon. This study explores how different piperazinium salt treatments using iodide, chloride, tosylate, and bistriflimide anions affect the energetics, carrier dynamics, and stability of 1.68 eV bandgap PSCs. Chloride-based treatments achieved the highest power conversion efficiency (21.5%) and open-circuit voltage (1.28 V), correlating with stronger band bending and n-type character at the surface. At the same time, they showed reduced long-term stability due to increased ionic losses. Tosylate-treated devices offered the best balance, retaining 96.4% efficiency after 1000 h (ISOS-LC-1I). These findings suggest that targeted surface treatments can enhance both efficiency and stability in PSCs. photovoltaics solar cell perovskite loss analysis interface passivation ionic losses perovskite solar cells stability fotovoltaika sončna celica perovskit analiza izgub true false true Angleški jezik Slovenski jezik Članek v reviji 2025-05-21 07:57:50 2025-05-21 07:57:55 2026-06-02 04:34:14 0000-00-00 00:00:00 2025 0 0 15 str. iss. 16, art. 2404726 Vol. 15 Apr. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.383.51 1614-6840 10.1002/aenm.202404726 227503363 Advanced_Energy_Materials_-_2024_-_Scheler_-_Correlation_of_Band_Bending_and_Ionic_Losses_in_1_68_eV_Wide_Band_Gap.pdf Advanced_Energy_Materials_-_2024_-_Scheler_-_Correlation_of_Band_Bending_and_Ionic_Losses_in_1_68_eV_Wide_Band_Gap.pdf 1 485AA6E26FBE68EAE071838317354529 3c3ed2aaa0523236634a11a17c4a4f67cf4c1e9b7b806120e7e33d403a4fe0d9 2e6640af-5dc8-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=234810 https://advanced.onlinelibrary.wiley.com/doi/10.1002/aenm.202404726 1 49d1c2db-3607-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=210507 Fakulteta za elektrotehniko 0 0 0