Xunlight Corporation

Xunlight Corporation

3145 Nebraska Avenue
Toledo, OH 43607
t: 419-469-8600
f: 419-469-8601


Xunlight Corporation, a technology spin-off from the University of Toledo, engages in the development, manufacture, and marketing of photovoltaic modules that convert sunlight into electricity. The company develops thin-film silicon based photovoltaic products and manufacturing equipment for high-throughput production of flexible and lightweight photovoltaic modules at low cost.

Xunlight Corporation is headquartered at 3145 Nebraska Avenue in Toledo, Ohio, and works closely with the Thin Film Silicon Photovoltaic Laboratory at the University of Toledo.


Xunlight Corporation products are thin-film silicon based solar cells and PV modules. These products utilize various thin film Si based alloys, including amorphous silicon (a-Si), amorphous silicon germanium (a-SiGe), and nanocrystalline silicon (nc-Si). Products with two different device structures are produced. These include:

  • a-SiGe based single-junction (SJ) solar cells
  • a-Si/a-SiGe/nc-Si triple-junction (TJ) solar cells

Xunlight Corporation’s academic partner, Dr. Xunming Deng’s Thin Film Silicon Photovoltaic Laboratory at the University of Toledo (UT), maintains the world record for efficiency of single-junction a-Si based solar cells. This is an important world record since it is a record for the most inexpensive type of silicon-based solar cells. Dr. Deng and his associates (students, postdoctoral researchers, and visiting scholars) at UT utilize a low-germanium content a-SiGe material and a specially designed p-type semiconductor layer for its solar cells; achieving single-junction solar cells with ~13% initial efficiency and 10.4% stabilized efficiency. Figure 4 illustrates the structure of this a-SiGe solar cell.

Xunlight/UT also fabricates triple-junction solar cells with a-Si, a-SiGe, a-SiGe having bandgaps of 1.8 eV, 1.6eV and 1.4 eV as the semiconductor absorber layers. The solar cells were measured at UT and at National Renewable Energy Laboratory (NREL). Below: photos showing single and triple junction cells structures, and the current-voltage performance of UT’s triple-junction solar cell measured at NREL, showing 11.8% total-area efficiency, corresponding to a 12.5% active-area efficiency.

Xunlight Corporation’s principal PV products are flexible and lightweight. These modules are made with flexible lamination, deposited on thin stainless steel substrates. These modules can be rolled during stowage and transport. Different product sizes, at rated peak power output of 200W, 100W, 20W, and 7.5W, will be offered.


Xunlight Corporation and its academic partner, the University of Toledo, have been leaders in tf-Si photovoltaic technologies. UT has granted XUNLIGHT CORPORATION a worldwide, exclusive license for all of thin film silicon based photovoltaic and related technologies developed by Dr. Deng and Dr. Deng’s group at the University. Xunlight Corporation/UT currently operates a 100KW pilot production line. The Xunlight Corporation/UT tf-Si PV technologies were developed over the past decade using various resources, including major grants from US Department of Energy and NREL, Air Force Research Laboratory, National Science Foundation, and Ohio Department of Development. The photos below show the plasma-enhanced chemical vapor deposition systems for the deposition of thin-film silicon based semiconductor layers and the magnetron sputter deposition system for all of the non-semiconductor layers, Al, Ag, ZnO and ITO, required for the solar cells.

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