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Trap State Effects in PbS Colloidal Quantum Dot Exciton Kinetics Using Photocarrier Radiometry Intensity and Temperature Measurements

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Abstract

Colloidal quantum dots (CQDs) have attracted significant interest for applications in electronic and optoelectronic devices such as photodetectors, light-emitting diodes, and solar cells. However, a poor understanding of charge transport in these nanocrystalline films hinders their practical applications. The photocarrier radiometry (PCR) technique, a frequency-domain photoluminescence method spectrally gated for monitoring radiative recombination photon emissions while excluding thermal infrared photons due to non-radiative recombination, has been applied to PbS CQD thin films for the analysis of charge transport properties. Linear excitation intensity responses of PCR signals were found in the reported experimental conditions. The type and influence of trap states in the coupled PbS CQD thin film were analyzed with PCR temperature- and time-dependent results.

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Acknowledgments

A. Mandelis is grateful to the Natural Sciences and Engineering Research Council (NSERC) for a Discovery grant, to the Canada Foundation for Innovation (CFI) for equipment grants, to the Canada Research Chairs Program, to the Ontario Ministry for Research and Innovation (MRI) for the Inaugural Premier’s Discovery Award in Science and Technology (2007), and to the Chinese Recruitment Program of Global Experts (Thousand Talents). J. Wang is grateful to the National Natural Science Foundation of China (Grant No. 61379013). Sjoerd Hoogland and Edward H. Sargent are acknowledged for CQD sample contributions.

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Authors and Affiliations

  1. School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610054, China

    Jing Wang, Andreas Mandelis & Qiming Sun

  2. Center for Advanced Diffusion-Wave Technologies (CADIFT), Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, M5S 3G8, Canada

    Andreas Mandelis & Alexander Melnikov

Authors
  1. Jing Wang
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  2. Andreas Mandelis
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  3. Alexander Melnikov
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  4. Qiming Sun
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Correspondence to Jing Wang.

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Wang, J., Mandelis, A., Melnikov, A. et al. Trap State Effects in PbS Colloidal Quantum Dot Exciton Kinetics Using Photocarrier Radiometry Intensity and Temperature Measurements. Int J Thermophys 37, 60 (2016). https://doi.org/10.1007/s10765-016-2065-x

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  • DOI: https://doi.org/10.1007/s10765-016-2065-x

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