Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.200
Publication date: 7th February 2022
Carbon electrode based perovskite solar cells (C-PSC) are promising candidates for commercialization of perovskite devices considering their low processing costs and extraordinary stability. However, due to the lack of hole selective layers, this device architecture still suffers from severe performance losses at the perovskite/carbon electrode interface. [1]
Recent advances in interface engineering by low dimentional 2D perovskites have proven to effectively passivate the surface of the 3D perovskite absorber.[2] We introduce a 2D perovskite passivation layer as an electron blocking layer at the perovskite/carbon interface in hole selective layer free carbon electrode based perovskite solar cells. The successful passivation of the interface was assessed through X-ray diffraction, X-ray photoemission spectroscopy, and an advanced spectrally resolved photoluminescence (PL), revealing the formation of a high band gap 2D perovskite layer. We confirm the electron blocking characteristic of the 2D perovskite through electrochemical impedance spectroscopy and illumination intensity dependent JSC-VOC measurements of carbon electrode based perovskite devices implementing the 2D perovskite at the 3D perovskite/carbon interface. We show a substantial reduction in charge extraction and interfacial recombination yielding a record efficiency of 18.5% with an improved stability over 500 hours of continuous illumination.
We thus employ a 2D-perovskite as an electron blocking layer in hole selective layer free carbon electrode based perovskite solar cells with printable low temperature carbon electrode. We demonstrate its electron blocking characteristic at the perovskite/carbon interface effectively allowing for less charge recombination losses leading to highly efficient devices.
This work was partially funded by the project UNIQUE, supported under the umbrella of SOLARERA.NET. Cofunded by ANR, PtJ, MIUR, MINECOAEI, and SWEA. SOLAR-ERA.NET was supported by the European Commission within the EU Framework Programme for Research and Innovation HORIZON 2020 (Cofund ERA-NET Action, no. 691664).
S. Z. gratefully acknowledges the Ph.D. scholarship support of the German academic exchange service (DAAD).
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