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NREL Identifies Where New Solar Technologies Can Be Flexible

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CdTe, CIGS and perovskites could be ideal for generating the electricity needed for unmanned drones, portable chargers, and building facades

Rigid silicon solar panels dominate the utility and residential markets, but opportunity exists for thin-film photovoltaic and emerging technologies notable for being lightweight and flexible, according to scientists at the US Department of Energy's National Renewable Energy Laboratory (NREL).

Thin films such as CdTe and CIGS, along with perovskites and other new technologies, could be ideal for generating the electricity needed for unmanned drones, portable chargers, and building facades. The opportunities and challenges inherent in widespread adoption of these ideas appear in the new Nature Energy paper, 'Increasing Markets and Decreasing Package Weight for High Specific Power Photovoltaics.'

“We explore the limits behind power-to-weight ratios and how this can generate value for emerging players in photovoltaics to enable them to reach gigawatt scale without having to directly compete with silicon solar panels,” said Matthew Reese, an NREL researcher and lead author of the paper. (Pictured above is a lightweight CIGS photovoltaic cell, on flexible stainless steel, was made by Matthew Reese and his team at NREL)

The researchers identified three high-value markets, each with a potential to cumulatively generate a gigawatt (GW) of electricity—at a price above $1 a watt—over the next ten years:

Aerospace and unmanned aerial vehicles - Powering satellites is driven by extremely high launch costs; whereas, there is an increasing desire to keep drones aloft for very long periods. For both of these applications, limited space makes efficiency and weight critical and cost secondary. A key player in this market is III-V PV, but while highly efficient it's also too expensive for many applications.

Portable charging - Making it easy for one person to install or move a portable charger is driving the need for PV technology that's efficient and flexible. Finding the correct balance between those requirements and cost could put millions of units into service by the military, disaster relief workers, and recreational users.

Ground transportation - The integration of PV in electric vehicles will compete with electricity coming from the grid, but the addition could extend the driving range. The PV would have to use smaller panels and be flexible enough to conform the contours of the roof.

The researchers identified these markets as smaller but significant and ones that will pay a premium for the added value of the technology being lightweight to support initial, low-scale production. As production increases, lower costs will follow.

The NREL team determined the lower limit for a lightweight PV device is between 300 and 500 grams per square meter. Below that would reduce reliability, durability, and safety. A lightweight module on the lower side of that range could generate more than a kilowatt of electricity from something that weighs as little as a six pack of soda. Conventional modules, even without the additional weight from the mounting equipment, might require 150-200 pounds to generate this much power.

Funding for the work came in part from the US Office of Naval Research and in part through NREL's Laboratory Directed Research and Development initiative.

NREL is the US Department of Energy's primary national laboratory for renewable energy and energy efficiency research and development. NREL is operated for the Energy Department by The Alliance for Sustainable Energy, LLC.


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