The distribution of uncompensated charges (space charge) at electroactive interfaces is central to their electronic properties and hence to the myriad of devices –such as photovoltaics, light-emitting diodes, sensors - based on them. Ionically functionalized conjugated polymers (conjugated ionomers) provide an intriguing chemical means of controlling the space charge distribution at interfaces based on these materials. They are consequently potentially important materials in the development of low cost, polymer-based electronics. In this talk, two examples are used to illustrate the potential of conjugated ionomers. The first is the observation of unidirectional current or diode behavior at a bilayer formed between an anionically and cationically functionalized polyacetylene. This system is unusual in that it is an asymmetry in an ionic processes that results in electronic current passing predominately in only one direction. The second is the first demonstration of a well-defined conjugated polymer pn homojunction. Here, the ionic functionalities are central to controlling interfacial reactions that would otherwise destabilize interfaces between differentially doped conjugated polymers.