 Electronic scale reduction technique |
| OF THE PREFERRED EMBODIMENTS Referring now to FIG. 1, this shows a sandwich-like assembly 10 of ... |
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| Lightweight solar module and method of fabrication |
| The present invention is directed to an improved solar cell module, comprising a substrate and a ... |
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| Solid state image sensing device |
| Accordingly, the object of the present invention is to provide a solid state image sensing device ... |
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| Device for one-sided etching of a semiconductor wafer |
| We claim: 1. An etching box type device for one-sided etching of a semiconductor wafer, said device ... |
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Polyimide composition and method for protecting photoreactive cells
| Details |
Inventors: DuPont, Preston S.; Bilow, Norman;
Assignee: Hughes Aircraft Company (Los Angeles, CA)
Primary Examiner: Kight; John
Assistant Examiner: Moore; M. L.
Attorney, Agent or Firm: Lachman; M. E., Karambelas; A. W.
A protective coating for solar cells, particularly solar cells positioned in space and which coating is a polyimide which is colorless, transparent, relatively non-brittle, has a high degree of thermal stability and readily transmits solar radiation without appreciable degradation. The coating is heat resistant and does not degrade significantly when exposed to ultraviolet radiation, and is highly effective in repelling low energy proton particles. In a preferred embodiment, the protective polymide coating is a polymer having the following recurring structural unit: ##STR1## |
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DETAILED DESCRIPTION OF THE INVENTION Referring now in more detail and by reference characters to the drawing, there is shown a solar cell having a polyimide coating as hereinafter described.
The photocell itself generally comprises a base of p-type semiconductor material which constitutes a p-layer 10 and which is doped on one surface with an n-type material forming an n-layer 12 having a p-n junction 14 therebetween.
A p-layer electrode 16 is attached to the bottom side of the p-layer 10 for an electrical conductor to be connected thereto.
An n-layer electrode 18 may be connected to the n-layer 12 to enable an electrical conductor to be connected thereto.
The n-layer electrode usually includes a number of so-called relatively thin fingers extending throughout the surface area of the n-layer so as to avoid any substantial interference with visual light radiation impingement on the photocell.
The photoreactive layers or so-called "photo-voltaic" layers including the n-layer 12 and p-layer 10 and junction 14 may adopt the form of a silicon material or it may be a III-V compound such as gallium arsenide, gallium arsenide-phosphide, etc.
Other photo-voltaic materials well known in the art may be employed and may be properly doped.
In many cases, an anti-reflective coating 20 may be employed and would be deposited directly on the active surface of the cell prior to application of the polyimide protective coating.
A suitable anti-reflective coating is a combination of TiO.
sub.
x and Al.
sub.
2 O.
sub.
3, Ta.
sub.
2 O.
sub.
5 or SiO.
sub.
x.
Prior to the application of a polyimide coating 22 prepared in accordance with the present invention, a primer coating 24 may be applied to the upper surface of the n-layer 12 or to the anti-reflective coating 20, if employed.
The primer coating 24 would-generally increase the adhesion of the polyimide coating to the solar cell and particularly to the upper surface of the anti-reflective layer 20 thereof.
A typical primer for this purpose is a silane adhesion promoter, such as aminopropyltrimethoxysilane
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MEMS 
