Solution processable high-performance infrared organic photodetector by iodine doping

Pin Tian, Libin Tang, Jinzhong Xiang, Zhenhua Sun, Rongbin Ji, Sin Ki Lai, Shu Ping Lau, Jincheng Kong, Jun Zhao, Chunzhang Yang, Yanhui Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

21 Citations (Scopus)


Solution processable high-performance, large-area, low-cost infrared organic photodetectors (OPDs) have been receiving more and more attention for their important applications both in scientific and technological fields. The search for a simple method to upgrade device performance for OPDs becomes increasingly important. Here, the performance of an OPD in the near-infrared (NIR) region is tremendously improved by doping iodine into the device's active layer (P3HT:PCBM:I2), 2.7 wt% iodine doping may increase the absorption by 31.3% for the active film and result in a ∼11000-fold increase in responsivity for the detector. A high detectivity (D∗) of ∼1.6 × 1012cm Hz1/2W-1, a good specific responsivity (R) of ∼80 A W-1and a large EQE (external quantum efficiency) of 120% are achieved under illumination (λ = 850 nm) at room temperature. Systematic characterizations reveal that iodine-doping can introduce acceptor states in the energy band gap for the polymer layer, and thus increase the harvesting to long wavelength photons. A small dose of iodine doping can significantly induce improvement in device performance. This work demonstrates a simple but feasible method to enhance an NIR optoelectronics device.
Original languageEnglish
Pages (from-to)45166-45171
Number of pages6
JournalRSC Advances
Issue number51
Publication statusPublished - 1 Jan 2016

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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