Side-chain engineering in naphthalenediimide-based n-type polymers for high-performance all-polymer photodetectors
A series of n-type semiconducting conjugated polymers based on naphthalene diimide (NDI) having three different side chains, 5-decylpentadecyl, 2-octyldodecyl and 4-(2-octyldodecyloxy)phenyl, were synthesized. Experimental results showed that the subtle structural changes at the side chains can influence the molecular packing, electron mobility, blend film morphology and thus performance of bulk-heterojunction polymer photodetectors using these NDI-based polymers as acceptors. The optimized all-polymer photodetector exhibited a specific detectivity (D∗) of over 1013 Jones in the spectral region of 300-800 nm under -0.1 V bias, which is among the best D∗ values of the reported UV-vis-NIR all-polymer photodetectors and comparable to the best fullerene-based photodetectors.
Hu, L. (Liuyong), Han, J. (Jinfeng), Qiao, W. (Wenqiang), Zhou, X. (Xiaokang), Wang, C. (Canglong), Ma, D. (Dongge), … Wang, Z.Y. (2018). Side-chain engineering in naphthalenediimide-based n-type polymers for high-performance all-polymer photodetectors. Polymer Chemistry, 9(3), 327–334. doi:10.1039/c7py01980g