Colloidal quantum dots on macroscale perovskite single crystal with perfect lattice matching

Quantum dots, semiconductor crystals with nanometer-scale dimensions, exhibit adjustable chemical, electrical, and optical characteristics owing to the quantum confinement effect. However, achieving high-quality quantum dots necessitates simultaneous attainment of crystalline integrity within their cores, uniformity in size and shape, as well as effective surface passivation with charge transport functionality—challenges persist regardless of the chosen method. Here, we introduce a novel approach for synthesizing quantum-dot/perovskite heterocrystals: the Colloidal Quantum Dot-Oriented Attachment to Perovskite Single Crystal (CQD-OA-PSC) method. This method involves optimizing quantum dot growth through chemical colloidal synthesis methods, followed by their oriented attachment onto macroscopic perovskite single crystals with impeccable lattice alignment. Consequently, the CQD-OA-PSC method amalgamates the strengths of wet chemical colloidal synthesis methods and solution-based epitaxial growth, offering precise control over quantum dot size, morphology, and structure while leveraging charge transport functionality conferred by the matrix crystal. High-resolution transmission electron microscopy confirms matched lattice orientations between the perovskite matrix and quantum dots. This approach promises to yield high-quality quantum dots perovskite heterocrystals with controlled size, morphology, and optoelectronic properties, thereby holding significant potential for advancing the development of efficient optoelectronic devices.