New architecture for high-efficiency polymer photovoltaic cells using solution-based titanium oxide layer

New architectural polymer photovoltaic cells approaching 5% power conversion efficiency have been fabricated using titanium oxide (TiOx) as an optical spacer. Solar cells with a TiOx layer (deposited by a sol-gel process) between the active layer and the electron collecting aluminum electrode exhibit approximately 50% enhancement in power conversion efficiency compared to similar devices without the optical spacer. The TiOx layer increases the efficiency by modifying the spatial distribution of the light intensity inside the device, thereby creating more photogenerated charge carriers in the bulk heterojunction layer.

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