Abstract
Photomultiplication (PM) type all-polymer photodetectors (all-PPDs) are first demonstrated with the sandwich structure of ITO/PEDOT:PSS/PBDB-T:PZ1 (100:x, wt/wt)/Al. The optimal PM type all-PPDs with PBDB-T:PZ1 (100:3, wt/wt) as active layers exhibit external quantum efficiency (EQE) of >100% in the spectral range from 310 to 790 nm. Under 675 nm light illumination, the champion EQE value arrives to 1,470% at −20 V bias and the specific detectivity approaches 1×1012 Jones at −10 V bias. The PM phenomenon in all-PPDs results from hole tunneling injection assisted by interfacial band bending induced by trapped electrons in PZ1 near Al electrode. The EQE values of optimal PM type all-PPDs still remained over 90% of the original value after 60 d of the storage in a high-purity nitrogen-filled glove box.
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This work was supported by the Fundamental Research Funds for the Central Universities (2019YJS207).
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Miao, J., Du, M., Fang, Y. et al. Photomultiplication type all-polymer photodetectors with single carrier transport property. Sci. China Chem. 62, 1619–1624 (2019). https://doi.org/10.1007/s11426-019-9582-7
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DOI: https://doi.org/10.1007/s11426-019-9582-7