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'[EE] Printed solar panels'
2008\07\15@095656 by Jinx

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Following up on a piece I saw on Discovery's Planet Green

www.konarka.com/index.php/site/press/konarka_announces_first_ever_dem
onstration_of_inkjet_printed_solar_cells

The company has a plastic-fullerene (Bucky Balls) mix that can be
printed. They're very close to volume production. What I saw in
the program were about 30mm wide strips of clear brown-tint on
a continuous water-clear plastic backing. The process seemed
like that for developing photographic film or printing a newspaper.
The substrate goes in one end, around a few rollers, and comes out
as a thin flexible finished product a short time later

Spokesman (the boss I think - Mr Konarka ?) claimed that price
should come down to 10c per watt, versus $2.50 per watt for
current technology, ie panels. One other big improvement is that
the film is omni-directionally receptive and doesn't need to track
the sun. He claimed that it's efficient enough to work under house
lighting, for charging, powering Connect 4 games, etc

Picture and more

Startup Makes Cheap Solar Film Cells ... With an Inkjet Printer

http://www.popularmechanics.com/science/earth/4253464.html

2008\07\15@131251 by Joe Bento

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I thought the latter part of your description rather odd - that is till
I remember the ongoing discussion on [PIC].  :-)

While at the Dayton Hamvention, I bought a flexible solar panel that
rolls up like a poster.  It's good for 12v at about 5w, which should
certainly be good enough for the brightest LED matrix.  :-)

Joe



Jinx wrote:

> He claimed that it's efficient enough to work under house
> lighting, for charging, powering Connect 4 games, etc
>
>  

2008\07\15@175420 by Jinx

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> I bought a flexible solar panel that rolls up like a poster.  It's good
> for 12v at about 5w

Really ? I didn't know anything like that was on the market. When
you say 'flexible', is that an array of small panels that can be rolled
up ? Like spacecraft/satellites/rovers use ?

2008\07\15@180941 by Nicola Perotto

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Here an example:
http://www.robot-italy.com/product_info.php?cPath=4_82&products_id=466


Jinx wrote:
>> I bought a flexible solar panel that rolls up like a poster.  It's good
>> for 12v at about 5w
>>    
>
> Really ? I didn't know anything like that was on the market. When
> you say 'flexible', is that an array of small panels that can be rolled
> up ? Like spacecraft/satellites/rovers use ?
>
>  

2008\07\15@181614 by Joe Bento

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See
http://store.altenergystore.com/Solar-Panels/Flexible-Rollable-Solar-Panels/PowerFilm-Inc-9W12V-Thin-Film-Solar-Panel/p705/?source=froogle

The whole panel is a flexible - cells and all.  It's as though the
individual cells are printed on rubber.

Joe


Jinx wrote:
>> I bought a flexible solar panel that rolls up like a poster.  It's good
>> for 12v at about 5w
>>    
>
> Really ? I didn't know anything like that was on the market. When
> you say 'flexible', is that an array of small panels that can be rolled
> up ? Like spacecraft/satellites/rovers use ?
>
>  

2008\07\15@182416 by Joe Bento

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Nicola Perotto wrote:
> Here an example:
> http://www.robot-italy.com/product_info.php?cPath=4_82&products_id=466
>
>  
Yes, that's exactly what I bought.  Don't exactly know what I'm going to
do with it yet, but it was just too cool to pass up.

Joe

2008\07\15@183741 by Jinx

face picon face
> http://www.robot-italy.com/product_info.php?cPath=4_82&products_id=466

Nifty

Flexible solar panels and flexible batteries. The World Of Tomorrow. Today

2008\07\15@222021 by Apptech

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>> I bought a flexible solar panel that rolls up like a
>> poster.  It's good
>> for 12v at about 5w

> Really ? I didn't know anything like that was on the
> market. When
> you say 'flexible', is that an array of small panels that
> can be rolled
> up ? Like spacecraft/satellites/rovers use ?

Largely being sold to big users who may be selling it to end
users, but most is going into buildings and eg yachts.

Amorphous silicon and other thin film. Flexible substrates.
Can roll up. Can even crumple it if you must.

Silicon is fighting back. ANU (Australian National
University, Canberra) has "sliver cells" - micro machine a
silicon wafer and process sides of slots then break off
slivers. Very thin, flexible, cheaper. Higher efficiency
that thing film competitors so far.

Gargoyle anu sliver silicon solar
Hmm - from a private email yesterday - see below



       Russell

__________________


... CIGS.
It seems that people are trying very hard with it but that
there are practical issues still.

Base efficiency is below that of Silicon crystalline but
reasonable.
The gain is that it is a deposition technique (several ways
of doing it) and thin film allowing low use of materials and
low cost per Watt.

BUT just when all the new techniques seem to be looking like
replacing Silicon crystalline it fights back. The ANU have
long been at or near the front of world solar cell
technology and they, and probably many others, are working
on sliced silicon crystalline cells which yield good
efficiency, flexible cells, very very thin materials, semi
transparent cells (through spacing slivers), excellent
material utilisation and fully symmetric double sided cells.
They call one version of it "sliver technology"

Full paper on one method
65-MICRON THIN MONOCRYSTALLINE SILICON SOLAR CELL
TECHNOLOGY ALLOWING 12-FOLD REDUCTION IN SILICON USAGE

       http://solar.anu.edu.au/docs/65micronthinmonosi.pdf

Article style paper on sliver technology.
Invented in 2000 !!

   http://solar.anu.edu.au/docs/0603_Sliver_technology.pdf

and

   http://www.theage.com.au/news/business/solar-cells-wait-for-their-day-in-the-sun/2007/04/29/1177787972754.html

IEEE paper - abstract only

       http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?tp=&arnumber=1305252&isnumber=28987


Epilift
Lowish information article.
Layers are grown and removed

       http://www.questacon.edu.au/html/assets/pdf/Sensational_Solar.pdf


2008\07\16@012305 by cdb

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:: Silicon is fighting back. ANU (Australian National
:: University, Canberra) has "sliver cells" - micro machine a
:: silicon wafer and process sides of slots then break off
:: slivers. Very thin, flexible, cheaper. Higher efficiency
:: that thing film competitors so far.

Aha that's the one I thought was CSIRO, anyhow the then government
didn't think it important enough technology to warrant further grants
or investment.

Colin
--
cdb, spam_OUTcolinTakeThisOuTspambtech-online.co.uk on 16/07/2008

Web presence: http://www.btech-online.co.uk  

Hosted by:  http://www.1and1.co.uk/?k_id=7988359






2008\07\16@014456 by Apptech

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> :: Silicon is fighting back. ANU (Australian National
> :: University, Canberra) has "sliver cells" - micro
> machine a
> :: silicon wafer and process sides of slots then break off
> :: slivers. Very thin, flexible, cheaper. Higher
> efficiency
> :: that thing film competitors so far.
>
> Aha that's the one I thought was CSIRO, anyhow the then
> government
> didn't think it important enough technology to warrant
> further grants
> or investment.

They have two systems. Both produce very thin small sized
slices of Silicon cells.

One feature of many - because of the small size, a set of
slivers can be joined in series to make a higher voltage
panel and then paralleled with others to make a high voltage
panel. This has the disadvantage of requiring an isolation
diode per small panel BUT the advantage of adding immunity
to shadowing as shadows just drop out one or more small
cells. In present arrangements where all cells are in
series, shadowing one cell reduces total panel output
markedly.

The 2 sided cells could be mirror driven from the bottom (or
both sides for ~~= double output.

The basic system was devised in 2000!. Just getting to
market. Mechanically flexible!.


       Russell

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