Correlation of band bending and ionic losses in 1.68 eV wide band gap perovskite solar cells

Scheler, Florian (author), Mariotti, Silvia (author), Mantione, Daniele (author), Shah, Sahil (author), Menzel, Dorothee (author), Köbler, Hans (author), Simmonds, Maxim (author), Gries, Thomas W. (author), Kurpiers, Jona (author), Škorjanc, Viktor (author), Topič, Marko (author)

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.

• Language: English
• Keywords: photovoltaics, solar cell, perovskite, loss analysis
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FE - Faculty of Electrical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2025
• Number of pages: 15 str.
• Numbering: Vol. 15, iss. 16, art. 2404726
• PID: 20.500.12556/RUL-169254
• UDC: 621.383.51
• ISSN on article: 1614-6840
• DOI: 10.1002/aenm.202404726
• COBISS.SI-ID: 227503363
• Publication date in RUL: 21.05.2025

Record is a part of a journal

• Title: Advanced energy materials
• Shortened title: Adv. energy mater.
• Publisher: Wiley-VCH
• ISSN: 1614-6840
• COBISS.SI-ID: 522022169

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: fotovoltaika, sončna celica, perovskit, analiza izgub