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Solution-Processable Cu(II) Phthalocyanine Derivative as Dopant-Free Hole Transport Layer for Efficient and Low-Cost Rutile TiO2 Array-Based Perovskite Solar Cells

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journal contribution
posted on 28.09.2018, 00:00 by Shufang Wu, Chi Chen, Qingwei Liu, Tianyou Peng, Renjie Li, Jing Zhang
The full-scale commercialization of the organometallic perovskite solar cells, as one of the most high-efficiency photovoltaic technology, needs to lower the cost and improve the long-term stability by further optimizing the device architecture and component materials. In this context, a solution-processable tert-butyl-substituted Cu­(II) phthalocyanine (CuPc­(tBu)4) is employed as dopant-free hole transport layer to fabricate a low-cost and high-efficiency perovskite solar cell with a low-temperature processed rutile TiO2 array as electron transport layer and a mixed-ion perovskite (Cs0.05(FA0.83MA0.17)0.95Pb­(I0.9Br0.1)3) as light absorber. It is found that the optimized rutile TiO2 array film-based solar cell with the dopant-free Cu­(II) phthalocyanine hole transport layer achieves a power conversion efficiency of 13.7% with less hysteresis, which can be further enhanced to 14.8% after introducing Al2O3 buffer layer between the Cu­(II) phthalocyanine hole transport layer and the perovskite layer due to the improvement of the interfacial contact. These results boost the potential of solution-processable Cu­(II) phthalocyanine derivatives as low-cost and stable hole transport layers for high-efficiency perovskite solar cells and thus provide an important future direction for the full-scale commercialization of perovskite solar cells.