Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Perovskite Solar Cells (PSC) have attracted a lot of interest in the photovoltaic community due to the rapid improvement in power conversion efficiency from the mere 3.8% in 2009 to 23.7% reached in 2018 [1]. However, the long-term stability of these devices remain as a major concern for large-scale commercial utilisation. One of the well-known degradation mechanisms is the reaction of metal electrode (particularly silver) with the migrated halide ions from the perovskite film [2]. This results in the formation of an insulating metal halide, which eventually hampers the charge collection [2]. Carbon has been widely explored as a stable back electrode for PSC on glass substrates. However, the deposition of carbon paste on plastic films is challenging. This is due to the strong mechanical force exerted by the microns large carbon flakes that cause the device shunting. In this work, an ultra-thin compact protective layer was deposited between the charge transport layer and the solution-processed, low temperature carbon back contact. On top of mechanical protection, the buffer layer also improves the electronic contact providing efficient charge extraction. We demonstrate the fabrication of flexible PSC with carbon as the back contact in both p-i-n and n-i-p architecture. The devices preserve very good stability for more than 2000 hours kept under constant illumination and maximum power point.
MAESTRO project that has resulted in this poster has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 764787.
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