Germanium Nanocluster Homogeneity in Flash Memory Dielectrics
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Solution Overview
Problem
Conventional methods for forming nanoclusters in semiconductor devices struggle to achieve homogeneous sizes and arrangements, particularly in flash memory devices, leading to inefficiencies in charge storage and potential leakage currents.
Innovation Solution
A method involving the formation of a silicon dioxide layer on a silicon substrate, followed by the deposition of a germanium oxide layer in a low-oxygen atmosphere, subsequent annealing to create germanium nanoclusters, and further conversion of the germanium dioxide layer into silicon dioxide, embedding the nanoclusters within a dielectric layer using chemical vapor deposition and annealing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ion implantation process is used to form nanoclusters, then nanoclusters can be formed in substrate, but homogeneous sizes and homogeneous distances between nanoclusters cannot be achieved
Solution Approach 1:
The patent applies preliminary action by first forming a uniform nanocluster layer before embedding it in the dielectric material. This preliminary formation step allows for better control of nanocluster size and spacing uniformity before the final device structure is completed
Solution Approach 2:
The patent utilizes parameter changes by controlling deposition conditions (temperature, pressure, composition) during the formation of the nanocluster-containing layer. By adjusting these parameters, homogeneous nanocluster sizes and spacing are achieved without requiring ion implantation
2Manufacturing precision
If conventional processing conditions are used, then nanoclusters can be formed, but homogeneous arrangement and size control are difficult to obtain
Solution Approach 1:
The patent systematically changes processing parameters including deposition temperature (400-600°C), pressure conditions, and layer composition ratios to achieve homogeneous nanocluster formation. These controlled parameter changes enable precise control over nanocluster size and distribution
Solution Approach 2:
The patent employs composite materials by creating a dielectric layer containing embedded nanoclusters formed through controlled deposition. This composite structure allows the nanoclusters to be uniformly distributed within the dielectric matrix, achieving both homogeneity and functional performance
3Quantity of substance
If nanoclusters with smaller size are used in floating gate, then Coulomb blockage effect occurs and multi-bit information can be stored, but leakage current sensitivity increases
Solution Approach 1:
The patent changes the physical and chemical parameters of the nanoclusters including size (5-20 nm), composition (germanium-rich), and embedding depth to optimize the balance between storage capacity and leakage current. These parameter adjustments enable multi-bit storage while maintaining low leakage
Solution Approach 2:
The patent uses composite materials by combining germanium nanoclusters with silicon oxide dielectric material. This composite structure provides both the quantum confinement effect needed for multi-bit storage and the insulating properties needed to reduce leakage current sensitivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in more homogeneous germanium nanoclusters embedded in a silicon oxide dielectric layer, enhancing the storage capacity and reducing leakage currents in semiconductor devices, thereby improving the storage period and reliability of flash memory devices.
Implementation Method 1
altering the germanium oxide (GeO) layer into a germanium dioxide (GeO2) layer and/or a first group of germanium (Ge) nanoclusters
Implementation Method 2
silicon (Si) atoms of the silicon substrate, first silicon dioxide (SiO2) layer and/or silicon layer may diffuse and/or react with the germanium dioxide (GeO2) layer
Implementation Method 3
The germanium oxide (GeO) layer may be deposited by a CVD process under oxygen (O2) atmosphere
Data Source
AI summary
Methods of fabricating nanoclusters, e.g., germanium nanoclusters, and/or a dielectric layer having the same are provided. The method may include forming a first silicon oxide layer on a silicon substrate; forming a germanium (GeO) layer on the silicon oxide layer; altering the germanium oxide (GeO) layer into a germanium dioxide (GeO2) layer and/or a first group of germanium (Ge) nanoclusters; and/or altering germanium dioxide (GeO2) into silicon dioxide (SiO2) such that a second group of germanium (Ge) nanoclusters may be formed. The nanoclusters, e.g., germanium nanoclusters, may have more homogeneous sizes and/or may be more evenly arranged the dielectric layer such that the nanoclusters, e.g., germanium nanoclusters, may be easily used in a semiconductor device.