Issue 51, 2016, Issue in Progress

Solution processable high-performance infrared organic photodetector by iodine doping

Abstract

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 ∼11 000-fold increase in responsivity for the detector. A high detectivity (D*) of ∼1.6 × 1012 cm Hz1/2 W−1, a good specific responsivity (R) of ∼80 A W−1 and 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.

Graphical abstract: Solution processable high-performance infrared organic photodetector by iodine doping

Supplementary files

Article information

Article type
Paper
Submitted
30 Jan 2016
Accepted
01 May 2016
First published
03 May 2016

RSC Adv., 2016,6, 45166-45171

Solution processable high-performance infrared organic photodetector by iodine doping

P. Tian, L. Tang, J. Xiang, Z. Sun, R. Ji, S. K. Lai, S. Ping Lau, J. Kong, J. Zhao, C. Yang and Y. Li, RSC Adv., 2016, 6, 45166 DOI: 10.1039/C6RA02773C

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