Hydroxyl Functional Groups in Two-Dimensional Dion-Jacobson Perovskite Solar Cells

Bat El Cohen, Tal Binyamin, Tzipora Ben-Tzvi, Oren Goldberg, Adi Schlesinger, Isaac Balberg, Oded Millo, Elad Gross, Doron Azulay, Lioz Etgar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

In this work we demonstrate a new diammonium spacer molecule with hydroxyl functional groups forming a Dion-Jacobson perovskite. Polarization modulation infrared reflection absorption spectroscopy reveal hydrogen bonding between the iodide to the spacer molecule and in between the OH groups. As a result, we were able to demonstrate n = 5 low dimensional perovskite solar cell (LDPSC) with an efficiency of 10%. Photoconductivity measurements and scanning tunneling spectroscopy draw the band structure of this low dimensional perovskite (LDP) revealing in-gap states adjacent to the conduction band edge, consistent with Shockley-Reed-Hall modeling of the temperature-dependent photoconductivity. The LDPSC based on the diammonium spacer H3N-C4H6(OH)2-NH3 shows enhanced stability under a relative humidity of more than 50% over 1030 h. Evaluating the mechanism of the cell shows a misalignment of the hole selective contact with the LDP. Improving this interface can increase further the photovoltaic performance, demonstrating the potential of this new type of diammonium spacer in LDP.

Original languageAmerican English
Pages (from-to)217-225
Number of pages9
JournalACS Energy Letters
Volume7
Issue number1
DOIs
StatePublished - 14 Jan 2022

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