Posts Tagged ‘multijunction solar cell’

22 July

Dr. Henry Snaith Believes That We May Have Entirely Clean Energy In Five Years

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Dear Friends, Visitors/Viewers/Readers,

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Before our interview with Dr. Christopher Case, I confess I’ve only come across one article mentioning perovskite. I had no idea that it is a calcium titanium oxide mineral species

A Perovskite mineral (Calcium titanate) from Kusa, Russia. Taken at the Harvard Museum of Natural History (credit: wikipedia)

Perovskite, a calcium titanium oxide mineral species composed of calcium titanate. The mineral was discovered in the Ural Mountains of Russia by Gustav Rose in 1839 (credit: wikipedia)

originally discovered in the Ural Mountains of Russia in 1839, nor did I know that this perovskite structure has oxygen in its face centers.

Perovskite structure with a chemical formula ABX(3). The red spheres are X atoms (usually oxygens). The blue spheres are B-atoms (smaller metal cation such as Ti). The green spheres are the A-atoms (larger metal cation such as Ca).

But during my research for the interview, it’s become apparent that this solid state hybrid solar cells based on organometal trihalide perovskite absorbers will likely advance solar technology to the very highest efficiencies while retaining the very lowest cost.  In the next few years, the perovskite-based technology may emerge as a contender for the ultimately low-cost solar power. This may explain why the response from Dr. Henry Snaith, (researcher and developer of perovskite solar technology), to the question “Could we have entirely clean energy in five years?” is a resounding:”I absolutely believe we could.”

Let’s take a look at the reason why Dr. Snaith has such a strong belief in the future of solar/clean energy technology, video below:


In the next few years, we anticipate that Dr. Henry Snaith and his team of scientists will continue to tackle challenges in trap densities, doping densities, mobility, mechanisms for free carrier generations, etc., to further improve device performance. Many are expecting to see efficiency level of above 20% and use of perovskite as top cells in multijunction devices based on currently commercially available technology. It will be exciting to see the full potential of this emerging solar technology unveiling before our eyes. I hope you are also as hopeful and optimistic as Dr. Henry Snaith.

 

~have a bright and sunny day~

Gathered, written, and posted by sunisthefuture-Susan Sun Nunamaker

Any of your questions/comments/suggestions will be welcomed at sunisthefuture@gmail.com

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22 February

We’re Going Further Than Reaching the Moon, We’re Reaching For The Sun

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Dear Friends, Visitors/Viewers/Readers,

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People! People! My belief/suspicion has been confirmed !  Solar Industry is going to be BIG! Huge! In time, solar energy will no longer represent less than one percent of our energy portfolio.  If I were to wager on the matter, I’d bet that  solar energy will  eventually take care of more than 50% of our energy needs…just wait…in 10-20 years….

I’d like to invite you to a live discussion with Secretary of Energy Steven Chu on Friday, Feb. 22, 2013, at 2:00 pm EST, that was later streamed on Google +, Youtube, and energy.gov/live on the progress of  SunShot Initiative and the role solar power is playing in our growing clean energy economy.  Questions were taken in advance and during the Hangout: via emailing newmedia@hq.doe.gov, posting comments on the Energy Department’s Facebook page,  Google+ event, or tweeting @ENERGY using #askEnergy. In addition to Secretary Chu, various representatives from across the U.S. solar energy industry were also on the panel of discussion: Jeffery Halsey from Broward County (Broward County of Florida’s Director of Pollution Prevention, Remediation, and Air Quality division), Jeff Allen of Solar Junction‘s Vice President of Business Development, and Joe Desmond, Senior Vice President at Bright Source Energy. Video below:

Jeffery Halsy shared that homeowners from his community, due to their participation in the SunShot Initiataive’s Rooftop Solar Challenge,  were able to save time and money on installations by addressing the soft costs (including permitting, interconnection, and inspection requirements accounting for as much as 40% of the total cost of a single solar installation).  With preapproved design plans,Broward County residents are now able to get a solar energy system permit online in just half an hour, saving both time and money. Jeff Allen shared insight on how Solar Junction shattered an existing technical barrier with its commericia-ready SJ3 multijunction solar cell this year. Below, on the left, a graph of Bandgap vs. Max. Efficiency shows the Shockley-Queisser limit for efficiency of a single junction solar cell. It is essentially impossible for single-junction solar cell, under unconcentrated sunlight, to have more than 34% efficiency. Multijunction cell, however, can exceed that limit. The chart on the right below indicates various solar cell efficiencies researched and presented by NREL (National Renewable Energy Laboratory). The SJ3 multijunction solar cell, with its concentrating PV cell, using a focused lens to magnify light to 418 times the intensity of the sun, was able to set a new world record of 43.5% for solar cell conversion efficiency.

NREL (National Renewable Energy Laboratory)’s Best Research-Cell Efficiencies

Shockley-Queisser limit for the efficiency of a single junction solar cell. It is essentially impossible for a single-junction solar cell, under unconcentrated sunlight, to have more than ~34% efficiency. A multijunction cell, however, can exceed that limit.

Joe Demond talked about Ivanpah Solar Generating  Complex in California’s Mojave Desert;this utility-scale solar installation is the world’s largest solar thermal power plant under construction. Supported by an Energy Department loan guarantee, this project using mirrors to focus the power of the sun on solar receivers (through high temperature high pressure steam to turn the turbines) and is expected to generate enough electricity to power about 140,000 homes annually.  Bright Source hired over 2,300 workers to complete this project’s construction and installation phase. Furthermore, majority of this project’s supply chain comes from more than 17 states (such as Michigan-based Guardian Industries that supplied 160,000 of its EcoGuard Solar Boost mirrors).

View of Ivanpah Solar Electric Generating System from Yates Well Road, The Clark Mountain Range can be seen in the distance.

Evidently, SunShot Initiative has already accomplished a great deal in reducing the soft costs, in developing new approach in technological advancement, and improvement of old way of doing things to utility-scale. It will continue its aim in reducing the cost of solar energy to be competitive with any other form of energy, without the need of subsidy. The future looks bright for solar industry. The potential of reaching below $1/watt is within reach;cost of solar will be comparable to the new cost estimate of energy from natural gas within 10 years, without any need of subsidy.  As Secretary Chu indicated, “Without any subsidy, solar energy will be able to hold its own with any other form of energy. This is our SunShot! We’re going further than reaching the moon. We’re reaching for the Sun!”This is very exciting! It is so palpable that all solar enthusiasts can feel the energy soaring…now we need to spread this good news so to speed up the process of reaching that clean, healthy and war-free Clean Energy World.  Earthlings, get ready to learn more about Solar Energy so we can all apply ourselves in this Solar Future! Thank you, Secretary Chu, for making SunShot Initiative a reality!

~have a bright and sunny day~

Gathered, written, and posted by sunisthefuture-Susan Sun Nunamaker

Any of your comments/suggestions/questions will be welcomed at sunisthefuture@gmail.com

Homepage:  http://www.sunisthefuture.net


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