| abstract |
The invention relates to a chip card with a liquid display and a flat photovoltaic cell for its self-sufficient energy supply. The photovoltaic cell is preferably a dye-sensitized electrochemical photovoltaic cell with a charge transport layer which contains a hole conductor material. One or more spiro or hetero spiro compounds, in particular spirobifluorenes, are particularly preferably used as the hole conductor material. |