Highly Efficient and Stable Hybrid Perovskite Solar Cells by Introducing Novel IDTT-based Small Molecule Additive
발표자
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초록
내용
The defects existing in the organic-inorganic halide perovsktie films could bring about an adverse effect to both stability and efficiency of perovskite solar cells (PSCs). Here, the novel indacenodithieno[3,2-b]thiophene-based small molecule, IDTT-ThCz, was introduced into the perovskite film during antisolvent treatment step. The p-type characeteristics of the IDTT-ThCz molecule and smooth perovskite film contributed to efficient charge extraction from perovskite. In addition, the IDTT-ThCz molecule interacted with perovskite precursors and suppressed the decomposition of perovskite, passivating the defect states and reducing the defect density. As a consequence, the highest PCE of 22.5% was achieved for IDTT-ThCz treated PSCs owing to these improvements. Furthermore, the stability of PSCs improved as well, maintaining up to 90% of their initial efficiencies after 458h storage in thermal condition (85 degree) and up to 70% after 25000s of continuous illumination.