Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Titanium dioxyde is an extensively used n-type Electron Transport Layer used in organic solar cells. The formation of specific crystalline phase for TiOx usually requires high temperature processing and TiOx layers often induces a characteristic S-shape in I-V curves of solar cells which disappears under UV exposure. We recently reported on a low-temperature sputtering process (150 °C) for TiOx which lead to no S-shape in devices.
Little is known about the local electronic properties of these as-prepared surfaces and interface with organic acceptor layer. Here we report on the interface properties of this TiOx with a prototypical fullerene acceptor, showing the formation of an hybrid state that could explain the lack of S-shape observed in the device. These observations could be the key to efficient charge transport at the interface with organic acceptor layer and similar experiments will be performed with a non-fullerene organic acceptor, namely at the interface of ITIC/TiOx.
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