Perovskite single crystals have excellent X-ray photoelectric properties due to their high X-ray light absorption coefficients, long-range balanced electron and hole transport, long carrier diffusion lengths (as long as 3 mm), and remarkably low trap densities. This material is positioning it as the best alternative to CdTe and CdZnTe (CZT) crystals used in direct X-ray sensors. While CZT offers excellent absorptivity, it requires high-temperature processing conditions (>900 °C) and suffers from structural imperfections and compositional inhomogeneity. In contrast, perovskite single crystals possess the unique advantage of facile preparation using solution techniques at low (<100 °C) or even room temperature, enabling controlled growth of crystals with desired sizes and thicknesses at a low cost and high processing speed.
QDot™ Perovskite Single Crystals can be integrated into a QDot™ X-ray photodiode stack using bonding techniques. In principle, a QDot™ X-ray photodiode stack consists of a substrate, bottom electrode, a hole transport layer (HTL), a QDot™ Perovskite Single Crystal absorber, an electron transport layer (ETL), and a top electrode. These novel solution-based single crystals have made it possible to create highly efficient X-ray direct detectors with increased sensitivity at an affordable cost.
QDot™ Perovskite Single Crystals offer the following advantages:
- Solution-processed compound semiconductor single crystals to be used in direct X-ray photodetectors and image sensors.
- High crystallinity and purity perovskite single crystals are grown at low temperatures, enabling precise control over crystal stoichiometry and dimensions.
- Excellent X-ray light absorption coefficients, long-range balanced electron and hole transport, long carrier diffusion lengths, and remarkably low trap densities that result in high X-ray detectivity.
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The product is launched in collaboration with AYsensors: www.aysensors.com