완전 투명 태양광 패널 발명
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완전 투명 태양광 패널 발명
  • 양영석
  • 승인 2015.03.30 17:26
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재생가능 에너지 연구는 단기간 성과 아니야

미시간 주립대 연구진은 완전 투명한 태양광 농축기를 발명했으며, 태양 발전 가능 영역을 넓힘. 연구를 주도한 리차드 런트에 의하면 “유리 면적이 막대한 커다란 건물 혹은 휴대 기기, 자동차"까지 활용 분야가 무궁무진하다고 함.

과학적으로 투명한 태양광 패널은 모순이라고. 빛을 흡수해서 전하를 발생시키나 빛을 통과시키면 그 만큼 흡수율과 발전율이 떨어지는 이유. 따라서 지금까지 투명하다 주장하는 태양광 패널은 완전 투명과는 거리가 있었다고 함.

그러나 유기 소금(organic salt)이 육안으로 보이지 않는 자외선과 적외선은 흡수하면서 가시광선만을 선택적으로 통과시키는 것이 발견되면서 투명 패널 전력 생산을 가능하게 하는 기술 진보가 있어 왔음.

미시간 주립대 연구진은 현재 1%에 머물러 있는 발전 효율을 기술적으론 5%까지 높일 수 있다고 주장.
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재생가능 에너지 연구는 단기간 성과로 결정날 사업이 아닙니다. 국가에서 꾸준히 투자해야 합니다.

http://www.offgridquest.com/…/a-fully-transparent-solar-cel

A fully transparent solar cell that could make every window and screen a power source

Researchers at Michigan State University have created a fully transparent solar concentrator, which could turn any window or sheet of glass (like your smartphone’s screen) into a photovoltaic solar cell.

▲ Researchers at Michigan State University have created a fully transparent solar concentrator, which could turn any window or sheet of glass (like your smartphone’s screen) into a photovoltaic solar cell.

Unlike other “transparent” solar cells that we’ve reported on in the past, this one really is transparent, as you can see in the photos throughout this story. According to Richard Lunt, who led the research, the team are confident that the transparent solar panels can be efficiently deployed in a wide range of settings, from “tall buildings with lots of windows or any kind of mobile device that demands high aesthetic quality like a phone or e-reader.”

Scientifically, a transparent solar panel is something of an oxymoron. Solar cells, specifically the photovoltaic kind, make energy by absorbing photons (sunlight) and converting them into electrons (electricity). If a material is transparent, however, by definition it means that all of the light passes through the medium to strike the back of your eye. This is why previous transparent solar cells have actually only been partially transparent — and, to add insult to injury, they usually cast a colorful shadow too.



The organic salts absorb UV and infrared, and emit infrared — processes that occur outside of the visible spectrum, so that it appears transparent.

To get around this limitation, the Michigan State researchers use a slightly different technique for gathering sunlight. Instead of trying to create a transparent photovoltaic cell (which is nigh impossible), they use a transparent luminescent solar concentrator (TLSC). The TLSC consists of organic salts that absorb specific non-visible wavelengths of ultraviolet and infrared light, which they then luminesce (glow) as another wavelength of infrared light (also non-visible). This emitted infrared light is guided to the edge of plastic, where thin strips of conventional photovoltaic solar cell convert it into electricity. [Research paper: DOI: 10.1002/adom.201400103 - "Near-Infrared Harvesting Transparent Luminescent Solar Concentrators"]

If you look closely, you can see a couple of black strips along the edges of plastic block. Otherwise, though, the active organic material — and thus the bulk of the solar panel — is highly transparent. (Read: Solar singlet fission bends the laws of physics to boost solar power efficiency by 30%.)

Michigan’s TLSC currently has an efficiency of around 1%, but they think 5% should be possible. Non-transparent luminescent concentrators (which bathe the room in colorful light) max out at around 7%. On their own these aren’t huge figures, but on a larger scale — every window in a house or office block — the numbers quickly add up. Likewise, while we’re probably not talking about a technology that can keep your smartphone or tablet running indefinitely, replacing your device’s display with a TLSC could net you a few more minutes or hours of usage on a single battery charge.

The researchers are confident that the technology can be scaled all the way from large industrial and commercial applications, down to consumer devices, while remaining “affordable.” So far, one of the larger barriers to large-scale adoption of solar power is the intrusive and ugly nature of solar panels — obviously, if we can produce large amounts of solar power from sheets of glass and plastic that look like normal sheets of glass and plastic, then that would be big.  

 

자료참조 : OFFGRIDQUEST.COM

 

 

 

 


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