Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Hybrid Halide Perovskite are revolutionizing the photovoltaic field due to the high efficiencies obtained, as high as 20.1% of certified photoconversion efficiency, using solution processes at low temperature and consequently at low cost. However, the working principles of this kind of devices are not completely understood. Any photovoltaic devices needs a light absorbing material but also optimized selective contacts in order to produce an appropriated split of the Fermi levels. The work we present here focus on the modification of electron selective contact by the use of a self assembled monolayer of fullerene derivatives.
We have synthesized a series of fullerene derivatives containing a carboxylic acid functional group able to anchor to the TiO2 based electron selective contact. The carboxylic acid group works as head group by chemisorption onto the TiO2 surface allocating the fullerene moiety as tail functional group. The electron accepting properties of the fullerene derivatives have been characterized electrochemically and theoretically by Density Functional Theory. The effect of the fullerene derivative layer for the interfacial charge transfer or interfacial recombination processes has been analyzed and its implication on the solar cell performance is discussed in detail.
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