Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Perovskite Solar Cells (PSCs) represent one of the most attractive photovoltaic (PV) technology exhibiting a max certified power conversion efficiency (PCE) close to 23% [1]. To decrease the energy payback time of PSCs, several solutions have been developed to avoid the use of dry and/or inert atmosphere (i.e. glove box) and the elimination of high temperature steps required for the sintering of transporting layers such the mesoscopic TiO2 scaffold. Several Electron Transporting Layers (ETL) can be processed at Low Temperature (L-T) such as SnO2 which has a good transmittance in the visible range and high electron mobility [2]. Despite the high PCE reached with this ETL (21.6%) several issues regarding the stability are to be clarify. In fact, no many reports shown the stability of the SnO2 based planar devices that generally suffer a faster degradation under illumination condition with respect to the mesoporous counterpart. In this work we report the PV performances and the stability of a FTO/SnO2/MAPbI3/Spiro-OMeTAD/Au fully processed in air (beside the thermal Au deposition in vacuum) by inserting a small amount of Cesium between the ETL and the active material. The PCE of a doped-SnO2 was 18.2% with respect to a PCE of 17.3% of the reference cell. The effect of the Cs+ insertion is evident also from the steady state efficiency after 180 s where the doped device shows a PCE of 18% with respect to the 17.3% of the un-doped counterpart. The shelf life of the doped ETL batch (unsealed devices) shows a decrease of the initial PCE after 1600 h of only 9% for cells stored in dark condition and with a constant relative humidity (RH) of 20%, with respect to a loss of 14% for the reference device. This result is in accordance with the improved efficiencies shown in literature by inserting a passivation layer [3-4]. Additional optimization in the ETL doping can further enhance the performances and stability of the planar structure.
[1] BestResearch-CellEfficiencies, 〈http://www.nrel.gov/ncpv/images/efficiency_chart.jpg〉 (accessed January 2018).
[2] J. Song, et Al, J. Mater. Chem. A, 2015, 3, 10837-10844.
[3] W. Ke, et al. Journal of Materials Chemistry A, 4 (2016) 14276-14283.
[4] S. Song, et al. ACS Energy Lett., 2017, 2 (12), 2667 -2673.
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