Nearly doubling the efficiency of a breakthrough photovoltaic cell they created last year, UCLA researchers have developed a two-layer, see-through solar film that could be placed on windows, sunroofs, smartphone displays and other surfaces to harvest energy from the sun.
The new device is composed of two thin polymer solar cells that collect sunlight and convert it to power. It’s more efficient than previous devices, the researchers say, because its two cells absorb more light than single-layer solar devices, because it uses light from a wider portion of the solar spectrum, and because it incorporates a layer of novel materials between the two cells to reduce energy loss.
"Using two solar cells with the new interfacial materials in between produces close to two times the energy we originally observed," said Yang, who is also director of the Nano Renewable Energy Center at the California NanoSystems Institute at UCLA. "We anticipate this device will offer new directions for solar cells, including the creation of solar windows on homes and office buildings."
The tandem polymer solar cells are made of a photoactive plastic. A single-cell device absorbs only about 40 percent of the infrared light that passes through. The tandem device — which includes a cell composed of a new infrared-sensitive polymer developed by UCLA researchers — absorbs up to 80 percent of infrared light plus a small amount of visible light.
Chun-Chao Chen, a graduate student in the UCLA materials science and engineering department who is the paper’s primary author, said using transparent and semi-transparent cells together increases the device’s efficiency, and that the materials were processed at low temperatures, making them relatively easy to manufacture.
Other authors of the study were Gang Li, a staff researcher in the materials science and engineering department at UCLA; Jing Gao, a materials science and engineering graduate student; and Letian Dou and Wei-Hsuan Chang, graduate students in the UCLA materials science and engineering department and the California NanoSystems Institute.
The research was funded by the Air Force Office of Scientific Research, the Office of Naval Research and EFL Tech.
Source: University of California – Los Angeles. "See-through solar film: Researchers double efficiency of novel solar cell." ScienceDaily, 29 Jul. 2013. Web. 30 Jul. 2013.
- Grid-Connected (Utility-Interactive) PV Systems
Types of PV Systems How Are Photovoltaic Systems Classified? Photovoltaic power systems...
- Optimal Planning Of Solar Power Plants
The photovoltaics industry is booming, and the market for solar farms is...
- IEA Technology Roadmap: Solar Heating and Cooling
The IEA’s Solar Heating and Cooling Roadmap outlines how best to advance...
- Two-thirds Of the World’s New Solar Panels Were Installed In Europe in 2011
In 2011, the photovoltaic industry production increased by almost 40% and reached...
Solar Energy | July 30, 2013