A facility for plastic deformation of germanium single-crystal wafers

A facility for plastic deformation of single-crystal germanium wafers is described. It consists of a commercial tube furnace which radiates heat to evacuated quartz-glass tubes housing the tools for bending and flattening of the wafers. The facility is semi-automatic and requires minimal attention. All movements and temperature changes are done by a robot via a PLC-control system. Two nine-crystal focusing monochromators (54 × 116 and 70 × 116 mm²) made from 100 wafers with average mosaicity ∼13′ have been constructed. Summaries of the test results are presented.

Keywords

• Neutron monochromators; 
• Plastic deformation of germanium; 
• Mosaic germanium monochromators; 
• Focusing monochromators
• 
  
• Source: Sciencedirect
  
  
  If you need more information about A facility for plastic deformation of germanium single-crystal wafers, please visit our website:http://www.qualitymaterial.net , send us email at powerwaymaterial@gmail.com.

Ambient stability of wet chemically passivated germanium wafer for crystalline solar cells

Surface passivation has been recognized as a crucial step in the evaluation of minority carrier lifetime of photovoltaic materials as well as in the fabrication of high efficient solar cells. Dilute acids of HF and HCl are employed for germanium (Ge) surface passivation. An effective lifetime of passivated Ge wafers has been evaluated by a microwave photoconductive decay (μ-PCD) measurement. Surface recombination velocities, S, of H- and Cl-terminated Ge surfaces are 23 and 37 cm/s, respectively. The stability of passivated Ge surfaces against exposure to air has also been examined. The HCl-passivated Ge surfaces are found to be more robust than HF-passivated surfaces.

Keywords

• Ge solar cells; 
• Minority carrier lifetime; 
• μ-PCD; 
• Surface passivation
• 
  
• Source: PAM-XIAMEN
  
  
  If you need more information about Crystal growth and detector performance of large size High-purity Ge crystals
• , please visit our website:http://www.qualitymaterial.net , send us email at powerwaymaterial@gmail.com.