Add time:08/04/2019         Source:sciencedirect.com

The development of solution-processed and dopant-free hole transporting materials (HTMs) are important for the future large-scale application of perovskite solar cells (PSCs). Here, a tetra-methoxyltriphenylamine substituted ZINC PHTHALOCYANINE (cas 14320-04-8) (OTPA-ZnPc) has been synthesized and utilized as a dopant-free HTM for PSCs. The introduction of 4,4′-dimethoxytriphenylamine side chains on ZnPc possesses a wonderful solubility in various solvents, such as dichloromethane, chlorobenzene, and N,N-dimethylformamide. The optimized devices achieved a power conversion efficiency of 16.23% under AM1.5 G standard conditions. What's more, due to the hydrophobic nature of the OTPA-ZnPc, the solar cells remained about 80% of its initial efficiency after 720 h of storage in ambient air with a humidity of approximately 45% without encapsulation, which is obvious better stability than the spiro-OMeTAD devices. Our results indicate that solution-processable OTPA-ZnPc is an encouraging dopant-free hole transporting material in perovskite solar cells.

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