Photomultiplication type all-polymer photodetectors with single carrier transport property

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2019,（12）
• 页码范围: 1619-1624
• 页数: 6页
• 语种: 英文

摘要

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.