Solar energy could be a central alternative to petroleum-based energy production. However, current solar-cell technology often does not produce the same energy yield（能量输出） and is more expensive to mass-produce. In addition, information on the total effect of solar energy production on the environment is incomplete, experts say. To better understand the energy and environmental benefits and detriments¹（损害，损失） of solar power, a research team from Rochester Institute of Technology has conducted one of the first life-cycle assessments³ of organic solar cells. The study found that the embodied⁴ energy — or the total energy required to make a product — is less for organic solar cells compared with conventional inorganic⁵ devices.

"This analysis provides a comprehensive assessment² of how much energy it takes to manufacture an organic solar cell, which has a significant impact on both the cost and environmental impact of the technology," says Brian Landi, assistant professor of chemical engineering at RIT and a faculty⁶ advisor⁷ on the project.

"Organic solar cells are flexible and lightweight, and they have the promise of low-cost solution processing, which can have advantages for manufacturing over previous-generation technologies that primarily use inorganic semiconductor⁸ materials," adds Annick Anctil, lead researcher on the study and a fourth-year doctoral candidate in RIT's doctoral program in sustainability. "However, previous assessments of the energy and environmental impact of the technology have been incomplete and a broader analysis is needed to better evaluate the overall effect of production and use."

The study sought to calculate the total energy use and environmental impact of the material collection, fabrication, mass production and use of organic solar cells through a comprehensive life-cycle assessment of the technology.

According to Anctil, previous life-cycle assessments had not included a component-by-component breakdown⁹ of the individual materials present in an organic solar cell or a calculation of the total energy payback of the device, which is defined as the energy produced from its use versus¹⁰ the energy needed to manufacture the cell.

The team found that when compared to inorganic cells, the energy payback time for organic solar cells was lower. Ongoing¹¹ studies to verify the device stability are still warranted, however.

"The data produced will help designers and potential manufacturers better assess how to use and improve the technology and analyze¹² its feasibility versus other solar and alternative-energy technologies," adds Landi.