Featured Research

from universities, journals, and other organizations

Promising Mechanically-stacked GaAs/Ge Multijunction Solar Cell Unveiled

Date:
September 22, 2009
Source:
Interuniversity Microelectronics Centre (IMEC)
Summary:
Researchers in Europe have presented a mechanically-stacked GaAs/Ge multijunction solar cell. This is the first promising demonstrator of a novel technology to produce mechanically stacked, high-efficiency multijunction solar cells, aiming at efficiencies above 40%.

IMEC's mechanically stacked GaAs/Ge cell.
Credit: Image courtesy of Interuniversity Microelectronics Centre (IMEC)

At the European Photovoltaic Solar Energy Conference (Hamburg, Germany), IMEC is presenting a mechanically-stacked GaAs/Ge multijunction solar cell. This is the first promising demonstrator of IMEC’s novel technology to produce mechanically stacked, high-efficiency multijunction solar cells, aiming at efficiencies above 40%.

At the top of the stack is a one-side contacted GaAs top cell that is only 4m thick and that is transparent for infrared light. Its efficiency is 23.4%, which is close to the efficiency of standard GaAs cells. IMEC has succeeded in transferring this GaAs top cell onto a Ge bottom cell, creating a mechanical stack. In that stack, the Ge bottom cell is separately contacted. It has a potential efficiency of 3-3.5%, which is higher than Ge bottom cells in state-of-the-art monolithically stacked InGaP/(In)GaAs/Ge cells. Looking forward, Giovanni Flamand, team manager at IMEC, expects to show a first working triple-junction cell beginning of 2010.

This cell is a demonstrator of IMEC’s innovative technology to produce mechanically stacked, high-efficiency InGaP/GaAs/Ge triple-junction solar cells. This includes manufacturing world-class thin-film III-V cells and Ge bottom cells, and developing a technology to mechanically stack them. The expected conversion efficiencies are 1-2% higher than those obtained today with monolithic triple-junction solar cells (> 40% with concentrated illumination). In addition, the new cells show an enhanced spectral robustness. Stacked solar cells combine cells made from different materials to capture and converse a larger part of the light spectrum than is possible with a single material.

Dr. Jef Poortmans, IMEC’s Photovoltaics Program Director: “Mechanical stacks are more complex to handle and interconnect. But they definitely offer a way to increase the conversion efficiency and energy yield of high-efficiency solar cells. And they also enable an efficient way to try and use new combinations of materials. For this technology, we profit from IMEC’s expertise in 3D stacking, growing III-V layers, and solar cell processing.”


Story Source:

The above story is based on materials provided by Interuniversity Microelectronics Centre (IMEC). Note: Materials may be edited for content and length.


Cite This Page:

Interuniversity Microelectronics Centre (IMEC). "Promising Mechanically-stacked GaAs/Ge Multijunction Solar Cell Unveiled." ScienceDaily. ScienceDaily, 22 September 2009. <www.sciencedaily.com/releases/2009/09/090921092049.htm>.
Interuniversity Microelectronics Centre (IMEC). (2009, September 22). Promising Mechanically-stacked GaAs/Ge Multijunction Solar Cell Unveiled. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2009/09/090921092049.htm
Interuniversity Microelectronics Centre (IMEC). "Promising Mechanically-stacked GaAs/Ge Multijunction Solar Cell Unveiled." ScienceDaily. www.sciencedaily.com/releases/2009/09/090921092049.htm (accessed July 31, 2014).

Share This




More Matter & Energy News

Thursday, July 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Britain Testing Driverless Cars on Roadways

Britain Testing Driverless Cars on Roadways

AP (July 30, 2014) British officials said on Wednesday that driverless cars will be tested on roads in as many as three cities in a trial program set to begin in January. Officials said the tests will last up to three years. (July 30) Video provided by AP
Powered by NewsLook.com
Amid Drought, UCLA Sees Only Water

Amid Drought, UCLA Sees Only Water

AP (July 30, 2014) A ruptured 93-year-old water main left the UCLA campus awash in 8 million gallons of water in the middle of California's worst drought in decades. (July 30) Video provided by AP
Powered by NewsLook.com
Smartphone Powered Paper Plane Debuts at Airshow

Smartphone Powered Paper Plane Debuts at Airshow

AP (July 30, 2014) Smartphone powered paper airplane that was popular on crowdfunding website KickStarter makes its debut at Wisconsin airshow (July 30) Video provided by AP
Powered by NewsLook.com
U.K. To Allow Driverless Cars On Public Roads

U.K. To Allow Driverless Cars On Public Roads

Newsy (July 30, 2014) Driverless cars could soon become a staple on U.K. city streets, as they're set to be introduced to a few cities in 2015. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



    Save/Print:
    Share:

    Free Subscriptions


    Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

    Get Social & Mobile


    Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

    Have Feedback?


    Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
    Mobile: iPhone Android Web
    Follow: Facebook Twitter Google+
    Subscribe: RSS Feeds Email Newsletters
    Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins