The effect of optical confinement in textured antireflection coating (AR coating) was investigated. Textured ZnO films prepared by metalorganic chemical vapor deposition were applied to solar cells as AR coating. The reflectance of the cells decreased as the grain size increased with film thickness, especially at long wavelength. This reduction in the reflectance caused an increase in short-circuit current and spectral response of the cells at near-infrared. The effect of optical confinement in the cell by this film was shown as far as long-wavelength range was concerned.
A mold coating material for a melt‐shaped crystal growth technique has been developed. After studying the contact angle and reaction between the molten silicon and other various high melting point materials, it was found that for shaped crystal growth with a lower impurity contamination level, a combination coating of
Si3N4
and
SiO2
is suitable for a mold coating material. A double layer coating was applied to the graphite mold base. The bottom layer in the mold, which had a 100–150 μm thickness, consisted of
Si3N4
that had been formed by nitriding a spray‐coated Si powder. The 200 μm thick top layer consisted of a
Si3N4‐SiO2
material. It had been produced by oxidizing a sprayed‐on coating consisting of
Si3N4
powder mixed in a silanol liquid. Using the mold prepared with these coatings, a melt‐shaped crystal growth technique was carried out by the spinning‐casting process. Polycrystalline silicon sheets, with a
10×10 normalcm
rectangular dimension and 0.5 mm thickness the size of a mold cavity, were obtained without adhesion to the mold. The sheet had an oxygen content of 1.7 ppm and a carbon content of 0.33 ppm. The mold was usable repeatedly up to 10 times.
Hoxan Research L a b o r a t o r i e s , Hoxan C o r p o r a t i o n 5-2, Kikusui, S h i r o i s h i -k u , Sapporo 003 Japan ABSTRACT A New Spin Cast P r o c e s s t o produce h i g h quali t y p o l y c r y s t a l l i n e s i l i c o n s h e e t s f o r low c o s t s o l a r c e l l s has been developed, and t h e equipment f o r mass-production h a s been c o n s t r u c t e d . Using t h i s p r o c e s s , h i g h q u a l i t y s i l i c o n s h e e t s , 10 cm x 10 cm and 0.4 mm t h i c k , were produced with a prod u c t i o n r a t e of 1 5 s e c / s h e e t . The b e s t s o l a r c e l l e f f i c i e n c y a c h i e v e d was 1 3 . 2 % ( 1 0 x 1 0 em2, AM 1 . 5 , 100 mW/cm2). I n a p r e v i o u s p r o c e s s , s i l i c o n s h e e t s were formed i n t h e c a v i t y of t h e mold modules u s i n g t h e c e n t r i f u g a l f o r c e e f f e c t of t h e s p i n c a s t zone. The c r y s t a l s were formed w h i l e t h e mold modules were s p i n n i n g . I n o r d e r t o o b t a i n a h i g h e r prod u c t i o n r a t e , a h i g h e r c r y s t a l g r o w t h r a t e was n e c e s s a r y . A h i g h e r growth rate, however, genera l l y r e s u l t s i n an i n c r e a s e i n c r y s t a l d e f e c t s and s t r e s s e s . These g o a l s f o r a high p r o d u c t i o n r a t e and f o r high q u a l i t y seemed t o be i n d i r e c t oppos i t i o n . H e r e , t o s o l v e t h i s p r o b l e m , we h a v e d e v e l o p e d a new S p i n Cast P r o c e s s , a n d w e h a v e c o n s t r u c t e d new equipment f o r mass-production.
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