Difference between colordial silver drpps n spray

Spin coating is a mature technology with the advantages of simple process, high repeatability, and good film quality. ДЄmong the deposition methods of colloidal QDs, spin coating technology is usually employed to obtain high-quality QDs-films. In addition, colloidal QDs are more suitable for the low-cost, solution-processable fabrication of photodetectors than traditional semiconductor materials because they can be easily deposited on various substrates without the need for high temperature or vacuum. These results demonstrate that QDs based detectors have excellent performance. These detectors reached remarkably high detectivity of more than 2 Г— 10 12 Jones in the range of 300вЂ“800 nm without an external bias voltage. Both rigid and flexible broadband photodetectors based on CdSeTe colloidal QDs have been made by our group. assembled a flexible photodetector based on the PbS QDs/ZnO nanoparticles with a detectivity of 3.98 Г— 10 12 Jones. fabricated a vertical field-effect phototransistor based on PbS quantum dots, which displayed a high detectivity of 2 Г— 10 13 Jones. For example, PbS quantum dots and 2D nonlayered CdS xSe 1в€’x nanosheet hybrid photodetectors with a detectivity of up to 1.05 Г— 10 15 Jones have been constructed. Photodetectors, which can capture optical signals and convert them into electrical signals, are playing increasingly significant role in many fields like optical communication, environmental monitoring, night vision and biomedical imaging. For example, detectors based on colloidal QDs have advantages like superior response range, high detectivity, low dark current density, high operating temperatures, excellent stability, and weak light response. Colloidal QDs have been used to construct various optoelectronic devices like solar cell, light-emitting diodes, and photodetectors. Application of the QDs in optoelectronic devices have attracted great attention because of their distinctive physical characteristics, such as size-tunable bandgap, high extinction coefficient, narrow emission spectra, high luminescent efficiency, and multiple exciton generation. Semiconductor nanocrystals with characteristic size below the Bohr radius of the charge carriers are called quantum dots (QDs).

Our study demonstrates that the spray coating is a very promising film fabrication technology for the industrial-scale production of optoelectronic devices. The large area detectors (the active area 1 cm 2) showed almost the same performance as the typical laboratory-size ones (the active area 0.1 cm 2). A large size QD-logo pattern film (10 Г— 10 cm 2) prepared by the spray coating process displayed excellent uniformity of thickness and absorbance. The photodetectors without bias voltage showed broadband response in the wavelength range of 300вЂ“800 nm, and high responsivity of 15 mA/W, detectivity of more than 10 11 Jones and rise time of 0.04 s.

The performance of the detector reached the highest values with 40 spray coating cycles of QD deposition. A mixture solvent with water and ethanol was introduced to enhance the adhesive force between QDs and the substrate interface. A technique for scalable spray coating of colloidal CdSeTe quantum dots (QDs) for photovoltaics and photodetector applications is presented.

Difference between colordial silver drpps n spray