Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Inverted lead halide perovskite solar cells have reached power conversion efficiencies (PCEs) > 18% compared to conventional perovskite solar cells with PCEs > 22%.[1-3] In order to further the performance of the inverted solar cells, different interlayers are being investigated. Among the different ideas and concepts under consideration, self assembled monolayers (SAMs) have shown significant influence on the solar cell properties.[4] In this study, we investigate the influence of functionalized benzylphosphonic acid SAMs (R-BPA SAMs) in inverted solar cells based on Cs0.1(FA0.83MA0.17)0.9Pb(I0.83Br0.17)3 triple cation perovskite absorber layers. We use nickel oxide (NiOX) and [6,6]-Phenyl C61 butyric acid methyl ester (PC60BM) as hole and electron transport material (HTM, ETM) respectively. For this study, functional groups were varied as Br, NO2, NH2, and OCH3. The presence of the SAM molecules was confirmed using X-ray photoelectron spectroscopy (XPS) and contact angle measurements. Upon the introduction of (4-bromobenzyl) phosphonic acid SAMs, we found an improvement in the solar cell performance compared to the solar cells without any SAM. The PCE increased (10.7 ± 1.2% to 13.5 ± 0.3%) and improvement in the fill factor (FF) was also observed (0.60 ± 0.06 to 0.66 ± 0.02). On the contrary, a reduction in open circuit voltage (VOC) was observed for (4-aminobenzyl) phosphonic acid SAMs. Furthermore, the influence of the different SAM layers on the perovskite films was studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD) studies to observe the crystallinity of the perovskite films.
Reference:
[1] M. Jahandar, N. Khan, H. K. Lee, S. K. Lee, W. S. Shin, J.-C. Lee, C. E. Song, S.-J. Moon, ACS Appl. Mater. Interfaces 2017, 9, 35871 – 35879.
[2] https://www.nrel.gov/pv/assets/images/efficiency-chart.png
[3] M. A. Green, Y. Hishikawa, W. Warta, E. D. Dunlop, D. H. Levi, J. Hohl-Ebinger, A. W. H. Ho-Baillie, Prog. Photovolt. 2017, 25, 668–676.
[4] Q. Wang, C. C. Chueh, T. Zhao, J. Cheng, M. Eslamian, W. C. H. Choy, A. K.-Y. Jen, ChemSusChem 2017, 10, 19, 3794–3803.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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