What is the fine-grained topic of the following text: Now, in an article that has just been published in Advanced Functional Materials, NUS and BASF scientists report that this challenge can be overcome by incorporating a monolayer of a suitable polyelectrolyte, which is an ionic polymer, at the contact area to cause self-aligned doping of the adjacent semiconductor to a high density of electrons or holes, as desired. Only return the topic.
Incorporating a monolayer of a polyelectrolyte for self-aligned doping of semiconductors