Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Perovskite solar cells have gained great interest among the scientific community due to their rapid increase in efficiency. Even though perovskite solar cells are a low cost technology and have efficiencies exceeding 20%, they are not commercially available, mainly as a result of scalability, reproducibility and stability problems[1]. Regarding scalability, it is important to explore different techniques to deposit the layers that add up to make the solar cell. Addressing the need for a hole transporting materials (HTM), the electrodeposition of PEDOT is an interesting alternative to the traditional spin coated PEDOT:PSS because it does not generate much waste and it can be applied on substrates of different size and geometry. In addition, the electrochemical synthesis allows to obtain coatings with adjusted properties and great reproducibility [2, 3]. In this work we explore the use of electrochemically deposited PEDOT doped with Dodecyl sulfate and perchlorate anions (PEDOT:DS-ClO4) as an interesting HTM for devices employing ITO electrodes, since the use of detrimental PSS is avoided. The PEDOT:DS-ClO4 films were electrodeposited from an aqueous solution on ITO substrates through cyclic voltammetry. After the synthesis, the PEDOT films were thermally annealed at 120 and 150 °C in a hot plate and, to test their hole extraction capabilities, a MAPbI3 perovskite layer was then spin coated on top. The photoluminescence spectra of the MAPbI3/ PEDOT:DS-ClO4 /ITO substrates were measured and compared to MAPbI3/ITO samples. The results showed that the PEDOT:DS-ClO4 annealed at 120 °C has a strong quenching effect in comparison to the MAPbI3/ITO substrates. Interestingly, PEDOT:DS-ClO4 films annealed at 150 °C had a poor quenching effect, probably because at this temperature the films undergo some degradation. These results suggest that electrodeposited PEDOT:DS-ClO4 can be successfully employed as an excellent HTM.
The authors acknowledge the economic support of Universidad de los Andes, Faculty of Sciences project 2018-2 INV-2018-33-1308 and CEIBA foundation.
MTCM acknowledges the support from the Science Faculty (Programa de Investigación 2018-2019).
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