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Optimization of the response spectra of organic photodetectors based on P3HT:PC61BM using PCPDTBT as the third component

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Abstract

In this work, we report a new method for extending the response spectra of organic photodetectors (OPDs) by incorporating PCPDTBT in the P3HT:PC61BM. The effects of PCPDTBT incorporation on the optical and electrical properties of OPDs were investigated, It was found that when the mass ratio of P3HT:PCPDTBT:PC61BM was 8:2:10, the response spectrum of the active layer was extended to 840 nm. The responsivity (R) and external quantum efficiency of the OPDs reached 229, 278, 249 mA/W and 48%, 65%, 68% under 630, 530, and 460 nm illumination and − 1 V bias, respectively, and the detectivity (D*) reached 1012 Jones. The results show that highly ordered polymer PCPDTBT with appropriate mass ratio can increases the exciton generation in P3HT:PC61BM, which increases the photocurrent of the device. In addition, the addition of PCPDTBT promotes the crystallization of the film, reduces the density of trap defects in the film, and reduces the dark current of the device.

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Acknowledgements

The author is particularly grateful to the Shaanxi Provincial Natural Science Foundation Research Project Fund for its support, Fund Number 2019JM-251.

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  1. Department of Electronic Engineering, Xi’an University of Technology, Xi’an, 710048, China

    Tao An, Yongqiang Wang & Jiawei Xue

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  1. Tao An
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  2. Yongqiang Wang
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  3. Jiawei Xue
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Correspondence to Tao An.

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An, T., Wang, Y. & Xue, J. Optimization of the response spectra of organic photodetectors based on P3HT:PC61BM using PCPDTBT as the third component. Opt Quant Electron 52, 7 (2020). https://doi.org/10.1007/s11082-019-2123-2

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