Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Monolithically integrated tandem solar cells developed by combining silicon and perovskite cells are one of the most promising approaches for next-generation photovoltaics with performance beyond the single-junction limit at potentially low production costs. In such architecture perovskite solar cells (PSCs) are directly realized on the top of the silicon cell, using a transparent conductive oxide (TCO) as recombination layer followed by the deposition of the electron transport material (ETM) of the perovskite cell. Among all the n-type materials, SnO2 shows better optical and electrical properties, an appropriate band alignment to perovskite absorber, and easy low-temperature process respect to other n-type metal oxide commonly used [1].
In this work we investigate the potentiality of SnO2 on different TCOs, such as commercial FTO, sputtered AZO and ITO. The compact tin oxide layers are firstly deposited on glass/TCO by spinning process starting from a commercial SnO2 colloidal dispersion, then perovskite solar cells are completed. Promising results have been obtained on device architecture glass/ITO/SnO2/CH3NH3PbI3/Spiro-OMeTAD/Au with an efficiency of about 15%. We are currently studying how to further improve these results by doping the SnO2 with different nanoparticles, such as metals and metal oxides, or metal salts, thus enhancing the charge transport and reducing the charge recombination of PSCs, compared with the undoped SnO2 ETM. First results on glass/FTO/doped SnO2 perovskite solar cells show an enhancement of more than 20% of the relative efficiency when SnO2 is doped with In2O3 nanoparticles. Work is in progress to examine the doping effect of SnO2 on different TCOs.
This work was supported by the Italian Ministry of Economic Development in the framework of the Operating Agreement with ENEA for Research on the Electric System.
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