Enhanced photomultiplication of organic photodetectors: Via phosphorescent material incorporation

Jian Wang, Ming Liu, Jun Chen, Jae Hoon Son, Sang Young Jeong, Jing Xiao, Liang Chen, Kaixuan Yang, Zijin Zhao, Han Young Woo, Xiaoli Zhang, Fujun Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

Photomultiplication organic photodetectors (PM-OPDs) were successfully constructed with a planar structure of PBDB-T/ITIC-Br as the active layer sandwiched by electrodes. Some isolated electron traps near the top surface of PBDB-T will be formed because small content ITIC-Br will permeate into PBDB-T layer prepared by sequential spin-coating method. The PM-OPDs achieve an external quantum efficiency (EQE) of 260% at 360 nm under a -9 V bias. The phosphorescent material FIrpic was incorporated into the PBDB-T layer to adjust the PBDB-T molecular arrangement for enhancing the hole mobility in the active layer. The optimal PM-OPDs with PBDB-T : FIrpic (100 : 10, wt/wt) display an EQE value of 2500% at 360 nm under a -9 V bias. A linear dynamic range (LDR) of 137 dB and a specific detectivity (D∗) of 4.2 × 1012 Jones are also achieved in PM-OPDs with PBDB-T : FIrpic (100 : 10, wt/wt). Moreover, high-quality imaging with the PM-OPDs as photosensitive element was realized by utilizing imaging systems without current preamplifiers, indicating that the PM-OPDs have potential applications in imaging.

Original languageEnglish
Pages (from-to)16918-16924
Number of pages7
JournalJournal of Materials Chemistry C
Volume9
Issue number47
DOIs
Publication statusPublished - 2021 Dec 21

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Enhanced photomultiplication of organic photodetectors: Via phosphorescent material incorporation'. Together they form a unique fingerprint.

Cite this