The effect of Al$_2$O$_3$ on the performance of perovskite solar cells

Ajdič, Žan (author), Jošt, Marko (author), Topič, Marko (author)

Improving the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs) remain the two most important goals of perovskite research. Herein, the effects of Al$_2$O$_3$ interlayer on the performance of formamidinium-cesiums and “triple cation” PSCs by depositing a thin Al$_2$O$_3$ layer via atomic layer deposition on different interfaces are analyzed. It is found that it can efficiently serve as a passivation layer of perovskite absorber, as a seed layer for the compact growth of the subsequent SnO$_2$ layer, or as a capping layer to the whole cell in the superstrate configuration to prevent moisture ingress. The optimized devices utilizing Al$_2$O$_3$ have on average more than 1% absolute higher PCE, with reduced penetration of moisture inside the device. Especially, the capping layer has shown the greatest benefit, extending the stability of the devices by more than two times and allowing long-term operation without encapsulation. In the best case, a T$_{80}$ time of almost 900 h under day/night-cycling illumination is obtained. The observed trends are based on data from a large number of devices (more than 300 devices were tested in the maximum power point), which give statistical relevance to the promising results.

• Language: English
• Keywords: perovskites, perovskite solar cells, long-term stability, Al$_2$O$_3$, moisture, MPP tracking
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FE - Faculty of Electrical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: 9 str.
• Numbering: Vol. 8, iss. 12, art. 2400247
• PID: 20.500.12556/RUL-159119
• UDC: 5
• ISSN on article: 2367-198X
• DOI: 10.1002/solr.202400247
• COBISS.SI-ID: 197486339
• Publication date in RUL: 01.07.2024

Record is a part of a journal

• Title: Solar RRL
• Publisher: Wiley
• ISSN: 2367-198X
• COBISS.SI-ID: 11745620

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.