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SAM-Forming Agent for Efficient NBG-Type Perovskite Solar Cells: BrNH3-4PACz
Perovskite solar cells (PSCs) have attracted much attention as a potential next-generation solar cell. High-efficiency tandem PSCs can be fabricated by combining a wide-bandgap (WBG) Pb-PSC (top cell) with a narrow-bandgap (NBG) Pb/Sn-PSC (bottom cell). Based on this research background, in addition to conventional WBG-type PSCs, NBG-type PSCs have also been actively studied in recent years. PEDOT/PSS, a HTL material primarily used in p-i-n PSCs, has a drawback in that PSS oxidizes Sn2+ Therefore, in the fabrication of PSCs containing Sn, such as NBG-type PSCs, it is considered desirable to replace PEDOT/PSS with a self-assembled monolayer (SAM)-forming agent.1)
Product
The PACz series including BrNH3-4PACz are covered by a joint patent pending (PCT/EP2019/060586) of Helmholtz Zentrum Berlin für Materialien und Energie GmbH, Germany and Kaunas University of Technology, Lithuania. TCI has been granted the right to manufacture and sell these materials.
Advantages
- BrNH3-4PACz is suitable as a SAM-forming agent for Pb/Sn mixed NBG-type PSCs, and can achieve the highest level of efficiency among NBG-type PSCs.
- The phosphonic acid group treats the ITO surface, and the ammonium salt moiety (-NH3Br) bonded to the carbazole ring treats the perovskite layer surface (dual functions of passivation).
- SAMs based on BrNH3-4PACz have a smaller water contact angle and are relatively hydrophilic compared to SAMs based on other PACz series, improving wettability during perovskite layer formation.
References
- 1) Efficient Narrow Bandgap Pb-Sn Perovskite Solar Cells Through Self-Assembled Hole Transport Layer with Ionic Head
- 2) Tuning the Surface Energy of Hole Transport Layers Based on Carbazole Self-Assembled Monolayers for Highly Efficient Sn/Pb Perovskite Solar Cells
