Ambient Pressure XPS Investigation of Thermally Stable Halide Perovskite Solar Cells via Post-Treatment

Ning, Shougui; Zhang, Songwei; Sun, Jiaonan; Li, Congping; Zheng, Jingfeng; Khalifa, Yehia; Zhou, Shouhuan; Cao, Jing; Wu, Yiying

doi:10.1021/acsami.0c12044

Title: Ambient Pressure XPS Investigation of Thermally Stable Halide Perovskite Solar Cells via Post-Treatment

Journal Article · Fri Sep 04 00:00:00 EDT 2020 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.0c12044· OSTI ID:1657787

Ning, Shougui ^[1]; Zhang, Songwei ^[2]; Sun, Jiaonan ^[2]; Li, Congping ^[3]; Zheng, Jingfeng ^[2]; Khalifa, Yehia ^[2]; Zhou, Shouhuan ^[4]; Cao, Jing ^[3]; Wu, Yiying ^[2]

Sichuan Univ., Chengdu (China); The Ohio State Univ., Columbus, OH (United States)
The Ohio State Univ., Columbus, OH (United States)
Lanzhou Univ. (China)
Sichuan Univ., Chengdu (China)

Long-term thermal stability is one limiting factor that impedes the commercialization of perovskite solar cell. Inspired by our prior results from machine learning, we discover that coating a thin layer of 4,4’-dibromotriphenylamine (DBTPA) on top of a CH₃NH₃PbI₃ (MAPbI₃) thin film can improve the stability of the resultant perovskite solar cells. The passivated perovskite solar cells retained more than 96% of their initial power conversion efficiency over 1000 h at 85 °C in N2 atmosphere without encapsulation. Near-ambient pressure x-ray photoelectron spectroscopy (NAP-XPS) was employed to investigate the evolution of composition and evaluate thermal and moisture stability by in-situ studies. A comparison between pristine MAPbI₃ films and DBTPA-treated films shows the DBTPA treatment suppresses the escape of iodide and methylamine up to 150 °C under 5 mbar humidity. Furthermore, we have used ATR-FTIR and XPS to probe the interactions between DBTPA and MAPbI3 surface. The results prove that DBTPA coordinate with perovskite by Lewis acid-base and cation-π interaction. Compared with the 19.9% efficiency of pristine sample, the champion efficiency of passivated sample reaches 20.6%. Finally, our results reveal DBTPA as a new post-treating molecule that not only leads to the improvement of photovoltaic efficiency but also thermal and moisture stability.

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Research Organization:: The Ohio State Univ., Columbus, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-07ER46427

OSTI ID:: 1657787

Journal Information:: ACS Applied Materials and Interfaces, Vol. 12, Issue 39; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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