High-detectivity panchromatic photodetectors for the near infrared region based on a dimeric porphyrin small molecule

Liangang Xiao, Song Chen, Xuebin Chen, Xiaobin Peng*, Yong Cao, Xunjin ZHU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Solution processed bulk heterojunction organic photodetectors (OPDs) based on a conjugated dimeric porphyrin small molecule as the donor and PC71BM as the acceptor show a broad and strong spectral response from 300 to 1000 nm. At room temperature and zero bias, the panchromatic OPDs are responsive to the near infrared (NIR) region, exhibiting a very low dark current density of 4.25 × 10-10 A cm-2 with a very high external quantum efficiency (EQE) of 48% at 850 nm, leading to a responsivity of 0.33 A W-1 at 850 nm and detectivity of over 1013 Jones from 360 to 950 nm, with a peak detectivity value of 5.73 × 1013 Jones at 850 nm. All these parameters are among the best for small molecule NIR OPDs to date, and are comparable to the best NIR OPDs based on polymers, demonstrating the potential of small molecules in panchromatic photodetectors.

Original languageEnglish
Pages (from-to)3341-3345
Number of pages5
JournalJournal of Materials Chemistry C
Volume6
Issue number13
DOIs
Publication statusPublished - 2018

Scopus Subject Areas

  • Chemistry(all)
  • Materials Chemistry

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