ẢNH HƯỞNG CỦA SỰ PHA TẠP Co ĐẾN CÁC TÍNH CHẤT QUANG VÀ TỪ CỦA CÁC NANO TINH THỂ Zn1-xCoxSe

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Tác giả: Thanh Thanh Bùi, Thị Bích Đỗ, Cát Cương Khổng, Thu Lam Lê, Ngọc Dũng Lò, Thị Hiền Nguyễn, Xuân Ca Nguyễn, Minh Tân Phạm, Ngọc Thư Phạm

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2023

Mô tả vật lý: tr.119 - 127

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ID: 337038

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Các nano tinh thể (NC) bán dẫn ZnSe pha tạp ion Co2+ với nồng độ thay đổi được chế tạo thành công bằng phương pháp hoá ướt. Cấu trúc và thành phần của các mẫu được phân tích thông qua giản đồ nhiễu xạ tia X (XRD) và phổ tán sắc năng lượng tia X (EDX). Sự pha tạp thành công các ion Co2+ vào mạng nền ZnSe đã được chứng minh thông qua XRD, phổ hấp thụ và huỳnh quang. Độ rộng vùng cấm, hằng số mạng, kích thước tinh thể và kích thước của các NC ZnSe pha tạp Co được xác định thông qua XRD và phổ hấp thụ. Tính chất quang của các mẫu được khảo sát thông qua phổ hấp thụ và quang huỳnh quang. Bản chất và cơ chế của các quá trình phát xạ đã được nghiên cứu và giải thích chi tiết. Tính chất từ của các mẫu được nghiên cứu thông qua phép đo đường cong từ trễ, kết quả cho thấy các NC ZnSe có tính nghịch từ trong khi các NC ZnSe pha tạp Co có tính chất sắt từ yếu. Nguồn gốc từ tính của các NC ZnSe pha tạp Co đã được đề cập và giải thích. Các NC ZnSe pha tạp Co có các tính chất quang học và từ tính phụ thuộc mạnh vào nồng độ Co mở ra nhiều tiềm năng ứng dụng trong các lĩnh vực quang- điện tử.ZnSe semiconductor nanocrystals (NCs) doped with Co2+ ions were successfully fabricated by wet chemical. The structure and composition of the samples were analyzed through X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). The successful doping of Co2+ ions into the ZnSe host lattice was demonstrated through XRD, absorption and photoluminescene (PL) spectra. The band gap, lattice constant, crystallite size and size of Co-doped ZnSe NCs were determined through XRD and absorption spectra. The optical properties of the samples were investigated through absorption and PL spectra. The mechanism of the emission processes have been studied and explained in detail. The magnetic properties of the samples were studied through magnetic hysteresis curve measurement, the results showed that the ZnSe NCs are diamagnetic while the Co-doped ZnSe NCs have weak ferromagnetic properties. The magnetic of Co-doped ZnSe NCs has been mentioned and explained. Co-doped ZnSe NCs with optical and magnetic properties strongly dependent on Co concentrations make them potentially useful for opto-electronic fields.

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