Development of New Phthalocyanine-Based Hole Transport Materials for High Efficient and Stable Perovskite Solar Cells
Zeynep Dalkilic a, Nilgun K. Yavuz b, Ayfer K. Burat a, Cheong B. Lee c, Hyosung Choi c
a Department of Chemistry, Istanbul Technical University, Istanbul, 34469, Turkey.
b Energy Institute, Istanbul Technical University, Istanbul, 34469, Turkey.
c Department of Chemistry, Hanyang University, Seoul, 133-791, South Korea.
Poster, Zeynep Dalkilic, 115
Publication date: 23rd October 2018

For perovskite solar cells, one of the most efficient device architectures explored is n-i-p type structure in which HTL plays a significant role to achieve both long-term stability and enhanced performance. In the literature, there are lots of papers relating to new hole-transporting materials that have potentials to replace the most used spiro-OMeTAD. A wide number of HTMs including inorganic, polymer, metal organic compounds and small organic molecule HTMs have been synthesized and investigated. Among these materials, phthalocyanine stand out for its excellent optical property as well as their high mobility and thermal stability. The performance of phthalocyanine is associated with its thin film properties as HTL. Especially molecular aggregation in solvents causes solubility problem and poor device results. To overcome these drawbacks, large steric hindrance units were introduced at the peripheral sites of MPc (Zn or Cu), which suppress the molecular aggregation and  improve utilization of solution-processing. In our work, 4,5-bis((2,4-dichorophenly)thio) phthalonitrile was used to synthesis of MPcs. Functionalized MPcs had good optical and thermal properties to be used as HTM. After the MPc concentration was optimized, cell performance of corresponding MPc HTL-based PSC compared with the spiro-OMeTAD based HTL.

This study is supported by the Scientific and Technological Research Council of Turkey (TUBITAK) (International Doctoral Research Fellowship Programme-1059B141800004)

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