Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Hybrid halide perovskite solar cells (PSCs) have reached efficiencies higher than 22% in the last years. The properties of these materials and the processes involved, which are in solution and at low temperature, are the reason why they are really interesting for photovoltaic and optoelectronic applications. However, the selective contacts are one of the issues under current study due to their high effect on the performance of the final devices. In PSCs, the most employed hole transporting material (HTM) is Spiro-OMeTAD; nevertheless, it has shown photo-oxidation processes and the need of some additives to improve the performance.1, 2
Although fullerenes and derivatives have been commonly used as electron transporting materials (ETM), in this work, a fullerene based material (FU7), chemically designed to block electrons and act as hole selective contact, replaces the Spiro-OMeTAD. Additives are not needed with this compound and the efficiency of the PSCs obtained was up to 80% of the efficiency with Spiro-OMeTAD. In addition, devices with FU7 have shown a better stability than the reference ones. Moreover, PSCs were tested using fullerene-based ETM and HTM, showing an efficiency close to 9%.3
1. Chem. Mater. 28, 16, 5702-5709.
2. Sol. Energy Mater Sol. Cells 2016, 158, 189-194.
3. Chem. Eur. J. 10.1002/chem.201801069
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