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Design of a Low-Cost Automatic Diameter Control Czochralski (CZ) Crystal Growth System with VB.6.0 Software

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Czochralski technique has become the method of choice for the growth of many oxide materials that have applications in the lasers, radiation detectors and nonlinear optical devices. This technique is one of the widely used methods for growing bulk single crystals with high quality and homogeneity from congruent melts with faster growth rates. The present paper presents the design of a Czochralski crystal growth system with Automatic Diameter Control (ADC) developed in our Crystal Growth Laboratory. The system controls the diameter of the growing crystal by continuous weighing of growing crystal. The difference between the measured diameter and the desired diameter is incorporated in a feedback loop for controlling the temperature of the system using a computer controlled Visual basic V6.0 based control algorithm. A conventional pulling and rotation mechanism of the crystal is computer controlled using two stepper motors. The other components such as seed holder, pulling arrangement and seed weighing mechanism are designed and built in our workshop. The complete system costs approximately twenty five thousand dollars. Thus, system will be beneficial for Labs having limited budget and will be good learning experience for graduate students.
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Keywords: AUTOMATIC DIAMETER CONTROL; CRYSTAL GROWTH; CZOCHRALSKI TECHNIQUE; WEIGHING TECHNIQUE

Document Type: Research Article

Publication date: 01 December 2014

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  • Advanced Science, Engineering and Medicine (ASEM) is a science, engineering, technical and medical journal focused on the publishing of peer-reviewed multi-disciplinary research articles dealing with all fundamental and applied research aspects in the areas of (1) Physical Sciences, (2) Engineering, (3) Biological Sciences/Health Sciences, (4) Medicine, (5) Computer and Information Sciences, (6) Mathematical Sciences, (7) Agriculture Science and Engineering, (8) Geosciences, and (9) Energy/Fuels/Environmental/Green Science and Engineering.
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