Metallophthalocyanine-Based Molecular Dipole Layer as a Universal and Versatile Approach to Realize Efficient and Stable Perovskite Solar Cells

Journal article

Authors/Editors

NOPPORN RUJISAMPHAN

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Publication Details

Author list: Li F., Yuan J., Ling X., Huang L., Rujisamphan N., Li Y., Chi L., Ma W.

Publisher: American Chemical Society

Publication year: 2018

Volume number: 10

Issue number: 49

Start page: 42397

End page: 42405

Number of pages: 9

ISSN: 1944-8244

eISSN: 1944-8244

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85058094935&doi=10.1021%2facsami.8b15870&partnerID=40&md5=94ef39aba1b7854bb8af44f6e066f81c

Languages: English-Great Britain (EN-GB)

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Abstract

It is well known that tailoring the interfacial structure is very important for perovskite solar cells, especially for its performance and stability. Here, we report a universal and versatile method of modulating the energetic alignment between the perovskite and hole-transporting layer by introducing a multifunctional dipole layer based on metallophthalocyanine derivatives copperphthalocyanine (CuPc) or highly fluorinated copper hexadecafluorophthalocyanine (F16CuPc). Both molecules were introduced through an "antisolution" process to treat the surface of organic-inorganic CH3NH3PbI3 perovskite. The dipole layer can well align the interfacial energy levels, passivate the CH3NH3PbI3 surface, and fill the grain boundaries, resulting in greatly suppressed charge recombination. As a result, our planar CH3NH3PbI3 perovskite devices exhibit the best power conversion efficiency of 20.2%, with significantly enhanced open-circuit voltages (Voc) of 1.112 V (CuPc) and 1.145 V (F16CuPc), which is a record high Voc value for CH3NH3PbI3 thin-film solar cells. More importantly, the use of highly fluorinated F16CuPc produces a significantly more hydrophobic surface, leading to drastically improved long-term stability under ambient conditions. We believe that our study offers a general approach to making multifunctional dipole layers, which are necessary for achieving both stable and efficient perovskite solar cells. ฉ 2018 American Chemical Society.

Keywords

and open-circuit voltage, fluorination, interfacial dipole, metallophthalocyanine