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Organic-inorganic hybrid photodetector devices exploit the advantages of both such as low ionization potential and low toxicity of the organic molecules and high electron affinity and mobility of inorganic semiconductors. The incorporation of carbon quantum dots (CQDs) in the lithium doped ZnO (LZO) thin film has exhibited enhanced UV absorption and higher transmittance (89%) due to the quantum confinement effect. It has also improved the UV Photodetection performances [responsivity (57 mA/W), EQE (20%) and photocurrent (2.1 µA) at 5 V] when in comparison with LZO based devices, attributed to the efficient energy transfer between LZO and CQDs through the heterojunction. The CQDs/LZO hybrid thin films showed the photo-response (2.1 µA) at 3 V which is 3 times higher than that (0.7 µA) of LZO films. The slightly increased band gap of the hybrid thin film may be attributed to adsorption of CQDs on to the surface of the LZO and controlling the particle size (quantum confinement effect).

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Carbon Quantum Dots Incorporated Li-Doped ZnO (CQDs/LZO) Hybrid Thin Films for Improved UV Photodetection

  • 会议论文

  • 发表日期：

    2025年

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  • Joel K. Joseph,
  • Lavanya Thyda,
  • Koppula Naresh,
  • S. Suneetha,
  • Kuppusamy Thangaraju

摘要

Organic-inorganic hybrid photodetector devices exploit the advantages of both such as low ionization potential and low toxicity of the organic molecules and high electron affinity and mobility of inorganic semiconductors. The incorporation of carbon quantum dots (CQDs) in the lithium doped ZnO (LZO) thin film has exhibited enhanced UV absorption and higher transmittance (89%) due to the quantum confinement effect. It has also improved the UV Photodetection performances [responsivity (57 mA/W), EQE (20%) and photocurrent (2.1 µA) at 5 V] when in comparison with LZO based devices, attributed to the efficient energy transfer between LZO and CQDs through the heterojunction. The CQDs/LZO hybrid thin films showed the photo-response (2.1 µA) at 3 V which is 3 times higher than that (0.7 µA) of LZO films. The slightly increased band gap of the hybrid thin film may be attributed to adsorption of CQDs on to the surface of the LZO and controlling the particle size (quantum confinement effect).