Conduction and trap tuning of NiO mesoporous film used in p–type DSSC.

Luca D'Amario^a, Anders Hagfeldt^a, Leif Hammarström^a, Gerrit Boschloo^a

^aUppsala University, Sweden, Uppsala, Sweden

International Conference on Hybrid and Organic Photovoltaics
Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)

Ecublens, Switzerland, 2014 May 11th - 14th

Organizers: Michael Graetzel and Mohammad Nazeeruddin

Poster, Luca D'Amario, 367
Publication date: 1st March 2014

Nickel oxide has been used as the mesoporous electrode for p-type DSSC for many years but no high efficiency has been reached yet. We studied the electrical conduction of NiO mesoporous film with cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). We used unsensitized NiO on FTO as an electrode with no dye adsorbed on the surface. Tests made with a DSSC device-like cell (FTO-Pt- I^-/I₃^--NiO-FTO) showed a surprising high Faradaic current (20 mA/cm² at 1 V) proving a good electrical conductivity of mesoporous NiO. We also used lithium as dopant to increase the electrical properties of the film. The Li-doping resulted on widening the inert window (not conductive) in the CV plot. The EIS analysis clarified this behaviour is due to a strong dependence of the valence band shape and position respect to the Li-doping concentration.

Our results throw away any doubt about the poor conductivity of mesoporous NiO encouraging on putting more effort in p-type DSSC research.

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