Polymer photodiodes with broad spectral response above 1500 nm can be used for imaging in the near-infrared window of the atmosphere. Three low-bandgap polymers based on 3,6-dithiophen-2-yl-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DPP), [1,2,5]thiadiazolo[3,4-g]quinoxaline (TQ), benzobisthiadiazole (BBT), and dithienopyrrole (DTP) are designed and synthesized. No-gain and gain polymer photodiodes with polymers:PC71BM as active layer materials and with aluminum doped ZnO nanoparticles:2,9-bis(3-(dimethylamino)propyl)anthra[2,1,9-def:6,5,10-d'e'f']diisoquinoline-1,3,8,10(2H,9H)-tetraone (AZO:PDIN), MoO3, and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) as interlayer materials are prepared. No-gain photodiodes based on polymer P1 exhibit the external quantum efficiency (EQE) of 7.8% at 1200 nm, which is among the best values of polymer photodiodes known to date. Gain photodiodes based on P1 and P3 also exhibit a maximal EQE near 1200 nm. In addition, gain photodiodes based on P1 have a specific detectivity over 1013 Jones in 300-1360 nm and spectral response in the region of 300-1700 nm.

Additional Metadata
Keywords Broad spectral response, Low-bandgap polymers, Polymer photodiodes, [1, 2, 5]thiadiazolo[3, 4-g]quinoxaline
Persistent URL dx.doi.org/10.1002/adom.201800038
Journal Advanced Optical Materials
Han, J. (Jinfeng), Yang, D. (Dezhi), Ma, D. (Dongge), Qiao, W. (Wenqiang), & Wang, Z.Y. (2018). Low-Bandgap Polymers for High-Performance Photodiodes with Maximal EQE near 1200 nm and Broad Spectral Response from 300 to 1700 nm. Advanced Optical Materials. doi:10.1002/adom.201800038