Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.121
Publication date: 30th March 2023
Since lead-based perovskite solar cells still suffer several drawbacks such as a rather low stability against ambient conditions and severe toxicity of lead, lead-free double perovskite have emerged as new potential light-absorbing materials for solar cell applications. Among these materials, Cs2AgBiBr6 has so far been realized in solar cells exceeding a power conversion efficiency of 3 %.[1] To further optimize the solar cell performance, research focuses not only on the absorbing material itself but also on improving the charge-carrier transporting layers.[2] State-of-the-art perovskite solar cells often employ expensive organic hole transporting materials (HTM) such as Spiro-OMeTAD, motivating the search for more economical and better performing alternative HTMs.
Herein we report the crystal structure of EDOT-Amide-TPA from single crystal measurements as well as the first utilization of EDOT-Amide-TPA as a low-cost alternative to Spiro-OMeTAD as HTM in lead-free perovskite solar cells and link its stuctural properties to its superior charge carrier properties. It crystallizes in the triclinic space group P−1 with short intermolecular distances and very dense molecular packing, in contrast to the well-established HTM Spiro-OMeTAD. A comparison of EDOT-Amide-TPA with Spiro-OMeTAD shows an improved efficiency with the former when employed in lead-free double perovskite solar cells. Interestingly, in contrast to lead-based perovskites,[3] the better performance of EDOT-Amide-TPA cannot be attributed to higher VOC-values but rather to an improved charge carrier extraction, leading to higher JSC-values. This is confirmed by PL and EQE measurements and was explained by decreased recombination losses in the lead-free perovskite solar cells compared to the lead-based perovskites. The improved current densities were explained by the rather thin and compact HTM layer that is sufficient for EDOT-Amide-TPA, which is in line with the dense molecular packing in the solid state achieved by EDOT-Amide-TPA. The dense molecular packing of the HTM not only enables the formation of a thinner HTM layer but also increases the reproducibility of solar cell manufacturing.
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