Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Publication date: 27th October 2017
Spiro-OMeTAD is the de facto standard of hole transporting materials (HTMs) in perovskite solar cells (PSCs). The conversion efficiencies exceeding 20% has been reported for PSCs using this material. However Spiro-OMeTAD is relatively expensive among the materials used in PSCs. In order to reduce power generation costs, it is necessary to replace with cheaper materials.
Phthalocyanine is widely used as a pigment and known to have excellent durability. We have synthesized new phthalocyanine based HTMs (Pc-HTMs). These materials were soluble in chlorobenzene and toluene and could be deposited uniformly by spin-coating. The conductivity of as-deposited Pc-HTMs was lower than Spiro-OMeTAD, but improved to same level by post-annealing.
The efficiency when combined with K0.05(FA0.85MA0.15)0.95Pb(I0.85Br0.15)3 was above 15%. This was about 80% than that of PSCs using Spiro-OMeTAD. The Jsc was same as the case of Spiro-OMeTAD, but Voc and FF were lower than that case. The cells kept in low humidity and darkness maintained more than 80% of the initial efficiency after one month or more.
Acknowledgement: We acknowledge the grant from the New Energy and Industrial Technology Development Organization (Japan).
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