Interface Engineering with a Thienothiophene-Based Ammonium Salt for Realization of Semitransparent Perovskite Solar Cells with Enhanced Efficiency and Improved Stability

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2021-9

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Güneş, Ümmügülsüm

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The stability issues of perovskite solar cells (PSCs) is one of the most important factors preventing commercialization. Various approaches have been proposed to overcome this problem, and among them, interface engineering is highlighted as one of the most convenient ways. In this study, a thienothiophene based ammonium salt (TTMAI) was coated on 3D FAMA (((FAPbI3)1−x(MAPbBr3)x))-based perovskite. GIXRD and SEM analysis revealed that TTMAI did not incorporate in the 3D perovskite but only resulted in a change at surface morphology. The solar cells treated with TTMAI showed enhancement in fill factor (FF), increasing their power conversion efficiencies (PCEs) from 17% to over 20%. Moreover, due to the hydrophobic nature of the TTMAI, a remarkable improvement in stability was obtained. The solar cell treated with TTMAI retained 82% of its initial PCE. In comparison, the reference cells maintained only 38% of initial efficiency under 15% humidity for over 380 h. In addition, semitransparent perovskite solar cells (ST-PSC) were fabricated, and 17.9% PCE was achieved with a treated 3D perovskite stack, which is one of the highest reported efficiencies for FAMA-based 3D perovskites. Additionally, the TTMAI- treated ST-PSC maintained 87% of its initial PCE, whereas 3D only reference retained 69% for six weeks (>1000 h). These results clearly show that this study fills a critical void in perovskite research where highly efficient and stable semitransparent perovskite solar cells are scarce.

Subject Keywords

Interface engineering, Semitransparent psc, Hole extraction, Stability, Novel organic spacers

URI

https://hdl.handle.net/11511/93034

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Ü. Güneş, “Interface Engineering with a Thienothiophene-Based Ammonium Salt for Realization of Semitransparent Perovskite Solar Cells with Enhanced Efficiency and Improved Stability,” M.S. - Master of Science, Middle East Technical University, 2021.