Paper claims that the innovation of this category of materials is about manufacturability. Organic TEMs can be spray-on thin films and foams filled with cheap bulk powders, rather than growing inorganic planar semiconductors; The downsides have been that they're fragile and they aren't very good (by a factor of ~500 worse than inorganic semiconductor TEMs). They report on making them 5x better performance (so only 100x worse), and dramatically less fragile.
Presumably, this would have very different applications.
I think the idea is to use it for extremely low power "ambient computing" and for example wearables where the human provides the heat source (and which need to be flexible).