Low-cost solar cell

Low-cost solar cell

The low-cost solar cell is an effort to make solar power price competive with traditional (fossil fuels and nuclear power) energy sources.

The polysilicon shortage [http://www.greentechmedia.com/articles/charting-a-path-to-low-cost-solar-1128.html Greentech Media | Charting a Path to Low-Cost Solar ] ] has changed the economics, making technologies such as thin films, which use little or no silicon, more attractive.The cost per watt will be the determining factor for success. The solar industry can potentially reduce costs 40 percent over the next five years as the silicon shortage ends. [ [http://www.navigantconsulting.com Navigant Consulting ] ]

Fossil fuel parity

Grid parity, the point at which photovoltaic electricity is equal to or cheaper than grid power can be reached using low cost solar cells. It is achieved first in areas with abundant sun and high costs for electricity such as in California and Japan. [ [http://www.bp.com/genericarticle.do?categoryId=9013609&contentId=7005395 Going for grid parity] 2005 article] Grid parity has been reached in Hawaii and other islands that otherwise use diesel fuel to produce electricity. George W. Bush has set 2015 as the date for grid parity in the USA. [ [http://www.bp.com/sectiongenericarticle.do?categoryId=9019305&contentId=7035199 Gaining on the grid] ] [ [http://www.bp.com/popupimage.do?img_path=liveassets/bp_internet/globalbp/globalbp_uk_english/reports_and_publications/frontiers/STAGING/local_assets/images/fr19solar_parity570x417.jpg%20&alt_tag=Graphic%20about%20grid%20parity,%20when%20the%20cost%20of%20solar%20energy%20equals%20that%20of%20grid%20electricity The Path to Grid Parity] (Graphic)] General Electric's Chief Engineer predicts grid parity without subsidies in sunny parts of the United States by around 2015.

Other companies predict an earlier date. [ [http://www.reuters.com/article/environmentNews/idUSL1878986220071019 reuters.com] ] Oerlikon Solar has said its facilities will achieve grid parity by 2010 in connection with the opening of the company’s new fully-automated thin-film pilot line at the Solar Valley in Trübbach, Switzerland [http://www.renewableenergyfocus.com/articles/pv/bus_news/080902_oerlikon.html] .

ilicon shortage

Grid parity was delayed by the higher than expected cost of solar-grade silicon. Manufacturing capacity dropped after the collapse of the dotcom bubble in 2001, while the subsidies associated with feed-in tariffs in Germany introduced in 2004 increased the costs of solar cells worldwide and diverted suitable silicon away from sunnier and therefore more potentially economic locations such as India and Africa. [ [http://www.economist.com/business/displaystory.cfm?story_id=12010071 Solar rally] ] , The Economist, 28 August 2008] [ [http://www.renewableenergyworld.com/rea/news/infocus/story?id=43569 Does Solar PV Still Make Sense for the Developing World?] , Renewable Energy World]

Crystalline silicon

A number of analysts have predicted that polysilicon prices will drop as companies build additional polysilicon capacity more quickly than the industry’s projected demand. The development of the Renewable Energy Corporation´s Singapore site will enable REC’s ability to deliver polysilicon solar products that can compete with traditional energy sources in the sunny areas of the world without government incentives. [http://www.edb.gov.sg/etc/medialib/downloads/media_release_2007.Par.0075.File.tmp/New%20manufacturing%20complex%20to%20Singapore_FINAL.pdf]

On the other hand, the cost of producing upgraded metallurgical-grade silicon, also known as UMG Si, can potentially be one-sixth that of making polysilicon.

Thin film

Cadmium telluride solar cell

A cadmium telluride solar cell is a solar cell based on a cadmium telluride (CdTe) thin film, a semiconductor layer to absorb and convert sunlight into electricity


Dye-sensitized solar cell is another low cost solar cell option.

This cell is promising because it is made of low-cost materials and does not need elaborate apparatus to manufacture, so it can be made in a DIY fashion and allows more players to produce it than any other type of solar cell. In bulk it should be significantly less expensive than older solid-state cell designs. It can be engineered into flexible sheets. Although its conversion efficiency is less than the best thin film cells, its price/performance ratio should be high enough to allow them to compete with fossil fuel electrical generation.

Polymer/organic solar cells

Organic solar cells is a relatively novel technology, promising substantial price reduction (over thin-film silicon) and better energy payback time. These cells can be processed from solution, enabling the possibility for a simple roll-to-roll printing process, leading to a cheap, large scale (square kilometers per month) production.

Luminescent solar concentrator

Researchers at the Massachusetts Institute of Technology (MIT) have found a way to convert windows into devices that concentrate sunlight for conversion into electricity. MIT developed a mixture of dyes that can be painted onto a pane of glass or plastic. The dyes absorb sunlight and then re-emit it within the glass in a different wavelength of light, which then tends to reflect off the interior surfaces of the glass. As the light reflects within the glass pane, it tends to get channeled along the length of the glass to its edges, where it is emitted. The MIT researchers estimate that sunlight is concentrated by a factor of 40, allowing solar cells that are optimized for such concentrated sunlight to be mounted along the edges of the window. The unique optics of the approach yields a cheap solar concentrator that does not need to be pointed toward the sun, as is needed for lens-based concentrators. MIT estimates that the process will be commercialized by Covalent Solar within the next 3 years . [http://www.eere.energy.gov/news/enn.cfm#id_11936]

Concentrator photovoltaics

Compared to conventional flat panel solar cells, CPV is advantageous because the solar collector is less expensive than an equivalent area of solar cells. CPV system hardware is typically priced around 3 USD/Watt, whereas silicon flat panels are commonly 5 USD/Watt (not including any associated power systems or installation charges). Semiconductor properties allow solar cells to operate more efficiently in concentrated light, as long as the cell junction temperature is kept cool by a suitable heat sinks. CPV operates most effectively in sunny weather, since clouds and overcast conditions create diffuse light which essentially can not be concentrated.

Nanotechnology and Infrared

The technology of solar arrays of nanoantennas is expected to be highly efficient with regard to capturing energy (80% efficiency) and in the process of creating the device (cents per yard). [ [http://www.triplepundit.com/pages/nanoantennas-solar-arrays-that-002905.php Nanoantennas: Solar arrays that absorb energy even in the dark!!] February 11, 2008] Small square spirals of metal can be printed on plastic sheets, using roll-to-roll machinery [https://inlportal.inl.gov/portal/server.pt?open=514&objID=1269&mode=2&featurestory=DA_101047] . The antennas can capture energy associated with infrared radiation, which reaches the earth from the sun during the day and is emitted by the earth at night.

Commercial solar panels usually transform less that 20 percent of the usable energy that strikes them into electricity. Individual nanoantennas can absorb close to 80 percent of the available energy [https://inlportal.inl.gov/portal/server.pt?open=514&objID=1269&mode=2&featurestory=DA_101047] . The circuits themselves can be made of a number of different conducting metals, and the nanoantennas can be printed on thin, flexible materials like polyethylene, a plastic that's commonly used in bags and plastic wrap [https://inlportal.inl.gov/portal/server.pt?open=514&objID=1269&mode=2&featurestory=DA_101047] .

Double-sided panels could absorb a broad spectrum of energy from the sun during the day, while the other side might be designed to take in the narrow frequency of energy produced from the earth's radiated heat [https://inlportal.inl.gov/portal/server.pt?open=514&objID=1269&mode=2&featurestory=DA_101047] .

See also

* Capacitor
* Indoor light
* Investment in renewable energy
* Printed electronics
* Rectifier
* Roll-to-roll processing
* Solar hot carbon


External links

* [http://printedelectronics.idtechex.com/photovoltaicsusa08/en/ Photovoltaic technologies beyond conventional silicon] (IDTechEx).
* [http://www.greentechmedia.com/articles/charting-a-path-to-low-cost-solar-1128.html Charting a Path to Low-Cost Solar] .
* [http://www.iht.com/articles/ap/2008/08/20/business/NA-US-Energy-Summit.php Business leaders: Make renewable energy cheaper] (International Herald Tribune).
* [http://www.greentechmedia.com/events/live/nyc0908/thinfilmrevolution.html The Thin Film Revolution] .

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Solar cell — A solar cell made from a monocrystalline silicon wafer …   Wikipedia

  • solar cell — a photovoltaic cell that converts sunlight directly into electricity. * * * Any device that directly converts the energy in light into electrical energy through the process of photovoltaics (see photovoltaic effect). Solar cells do not use… …   Universalium

  • Dye-sensitized solar cell — A selection of dye sensitized solar cells A dye sensitized solar cell (DSSC, DSC or DYSC[1]) is a low cost solar cell belonging to the group of thin film solar cells.[2] …   Wikipedia

  • Thin film solar cell — Cross section of thin film polycrystalline solar cell. A thin film solar cell (TFSC), also called a thin film photovoltaic cell (TFPV), is a solar cell that is made by depositing one or more thin layers (thin film) of photovoltaic material on a… …   Wikipedia

  • Cadmium telluride solar cell — Articleissues advert = October 2008 COI = October 2008 wikify = October 2008A cadmium telluride solar cell is a solar cell based on a cadmium telluride (CdTe) thin film, a semiconductor layer to absorb and convert sunlight into electricity… …   Wikipedia

  • Quantum dot solar cell — Spin cast quantum dot solar cell built by the Sargent Group at the University of Toronto. The metal disks on the front surface are the electrical connections to the layers below. Quantum dot solar cells are an emerging field in solar cell… …   Wikipedia

  • Nanocrystal solar cell — Nanocrystal solar cells are solar cells based on a substrate with a coating of nanocrystals. The nanocrystals are typically based on silicon, CdTe or CIGS and the substrates are generally silicon or various organic conductors. Quantum dot solar… …   Wikipedia

  • Solar vehicle — A solar vehicle is an electric vehicle powered by a type of renewable energy, by solar energy obtained from solar panels on the surface (generally, the roof) of the vehicle. Photovoltaic (PV) cells convert the Sun s energy directly into… …   Wikipedia

  • Solar power in the United States — is the largest available energy source for the United States, although in 2006 it accounted for less than 0.1% of electricity generation. Renewable resources (solar, wind, geothermal, hydroelectric, biomass, and waste) provided nearly 12 percent… …   Wikipedia

  • Solar panel — Photovoltaic module redirects here. For the heat collectors, see Solar thermal collector. An installation of solar panels in rural Mongolia …   Wikipedia