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Open AccessArticle

Spray Coated Colloidal Quantum Dot Films for Broadband Photodetectors

1
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2
Department of Chemical Physics and NanoLund, Lund University, Box 124, 22100 Lund, Sweden
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(12), 1738; https://doi.org/10.3390/nano9121738
Received: 30 October 2019 / Revised: 23 November 2019 / Accepted: 4 December 2019 / Published: 6 December 2019
(This article belongs to the Special Issue Quantum Dots and Micro-LED Display)
A technique for scalable spray coating of colloidal CdSeTe quantum dots (QDs) for photovoltaics and photodetector applications is presented. A mixture solvent with water and ethanol was introduced to enhance the adhesive force between QDs and the substrate interface. The performance of the detector reached the highest values with 40 spray coating cycles of QD deposition. The photodetectors without bias voltage showed broadband response in the wavelength range of 300–800 nm, and high responsivity of 15 mA/W, detectivity of more than 1011 Jones and rise time of 0.04 s. A large size QD-logo pattern film (10 × 10 cm2) prepared by the spray coating process displayed excellent uniformity of thickness and absorbance. The large area detectors (the active area 1 cm2) showed almost the same performance as the typical laboratory-size ones (the active area 0.1 cm2). Our study demonstrates that the spray coating is a very promising film fabrication technology for the industrial-scale production of optoelectronic devices. View Full-Text
Keywords: quantum dots; spray coating; photodetector quantum dots; spray coating; photodetector
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MDPI and ACS Style

Song, K.; Yuan, J.; Shen, T.; Du, J.; Guo, R.; Pullerits, T.; Tian, J. Spray Coated Colloidal Quantum Dot Films for Broadband Photodetectors. Nanomaterials 2019, 9, 1738.

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