Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Halide perovskite solar cells (PSCs) have emerged as a competitive photovoltaic technology with power conversion efficiencies (PCEs) surpassing the 22 % mark. Despite these advantages, their operational stability and the materials toxicity remain of foremost concern. Stability issues appear in the halide perovskite itself but also in other constituent materials, as well as at interfaces between the various layers of the device. Correspondingly, several options have been proposed to reduce device degradation: inverting the solar cell structure to reduce reactivity, replacing organic semiconductors with oxides at interfaces to improve moisture and oxygen stability, or tuning the composition of the halide perovskite to stabilize its crystal structure and improve thermal strength, for example. Carbon-based halide perovskite solar cells have emerged as a promising scalable and stable solar cell configuration. The technology avoids the use of unstable hole transport layers, like Spiro-OMeTAD. Instead, it employs a nanoparticulated TiO2 thin film, followed by a coating of an inert layer of ZrO2 nanoparticles used as a scaffold. It is finally completed with a carbon-based coating which acts as a back current collector and a water-retaining layer. The halide perovskite is introduced into the oxide thin films via infiltration. This promising fabrication method has already generated devices with lifetime stability up to 10,000 h (1 year) under continuous illumination. One of the reasons behind its excellent stability seems to be, in part, to the presence of the two TiO2/ZrO2 oxide layers. In this work, we present our most recent results on the functionalization of semiconductor oxides by different organic molecules applied in printable mesoscopic Carbon-based PSCs applying the triple-layer TiO2/ZrO2/carbon architecture. We analyze the effect of different organic modifiers and the improvement in photovoltaic performance, reduced hysteresis and stability.
References:
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