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| Copper indium gallium selenide | |
|---|---|
| Name | Copper indium gallium selenide |
| Other names | CIGS |
| Formula | CuInxGa(1−x)Se2 |
| Appearance | dark semiconductor thin film |
| Category | chalcogenide semiconductor |
Copper indium gallium selenide is a quaternary chalcogenide semiconductor used primarily in thin-film photovoltaics. Developed through collaborations among institutions such as Stanford University, National Renewable Energy Laboratory, Massachusetts Institute of Technology, Fraunhofer Society, and manufacturers like First Solar and Solar Frontier, it competes with materials from Silicon Valley-backed firms and research centers in Japan, Germany, and South Korea. Historically influenced by work at Bell Labs, Rensselaer Polytechnic Institute, and the University of Delaware, the material's adoption ties to policy decisions in places such as California, Germany, and China.
Copper indium gallium selenide is represented by the formula CuInxGa(1−x)Se2 and forms a class of I-III-VI2 chalcopyrite semiconductors. Early synthesis efforts involved research groups at University of Freiburg, University of Tokyo, Imperial College London, University of New South Wales, and University of Colorado Boulder, with patent activity from entities like DuPont and Mitsubishi Electric. Adoption in commercial modules was advanced by companies including Shell-backed ventures and spin-offs from Stanford University laboratories. CIGS films are notable for direct bandgap tunability, enabling device engineering pursued by research teams at ETH Zurich, Tsinghua University, and Seoul National University.
The material crystallizes in a chalcopyrite-derived structure related to that studied at Max Planck Society institutes and described in textbooks used at University of Cambridge and Harvard University. Its bandgap is tunable between values studied by groups at Lawrence Berkeley National Laboratory and Oak Ridge National Laboratory, with reported direct bandgaps enabling strong optical absorption comparable to absorbers evaluated at Princeton University and Columbia University. Electronic properties, including carrier concentration and mobility, have been characterized in experiments by teams from Caltech, University of Oxford, and Nanyang Technological University, and are sensitive to defect chemistry explored by researchers at Argonne National Laboratory and Los Alamos National Laboratory. Crystal symmetry, grain boundaries, and phase segregation effects have been analyzed in studies involving University of Illinois Urbana-Champaign, Cornell University, and Rice University.
Preparation routes include vacuum-based techniques developed in labs at IBM Research, Hitachi, and Panasonic, as well as non-vacuum approaches advanced by Heliatek-affiliated researchers and groups at University of Groningen. Common methods are co-evaporation, sputtering, and solution processing; co-evaporation methods were formalized in collaborations between NREL and University of Toledo, while sputtering workflows were optimized at Tokyo Institute of Technology and Korea Advanced Institute of Science and Technology. Post-deposition treatments and annealing protocols studied at University of Minnesota and McMaster University adjust gallium gradients and selenium incorporation, drawing on precursor chemistry from laboratories at University of California, Berkeley and University of Michigan. Scale-up to module manufacturing has been pursued by firms like Solar Frontier and research consortia involving European Commission programs and Department of Energy initiatives.
CIGS serves as the absorber layer in thin-film solar cells studied in device architectures developed at NREL, Fraunhofer ISE, and Suntech Power. Typical devices incorporate transparent conductive oxides characterized by researchers at University of Tokyo and buffer layers such as cadmium sulfide optimized at University of Paris-Saclay and University of Barcelona. Tandem and multi-junction configurations integrating CIGS have been proposed in collaborations including EPFL, University of New South Wales, and Tokyo Institute of Technology researchers, while module integration strategies were piloted by Bosch-associated projects and industrial partners like Mitsubishi Heavy Industries. Performance benchmarking comparisons often reference standards set by International Electrotechnical Commission protocols and interlaboratory studies coordinated by NREL and Fraunhofer ISE.
Efficiency records and degradation mechanisms have been reported by teams at NREL, Fraunhofer ISE, University of Illinois, and University of Twente. Degradation pathways involving moisture ingress and alkali diffusion were investigated in studies from University of Stuttgart, Tohoku University, and University of Copenhagen. Strategies to enhance stability include surface passivation researched by groups at University of California, Santa Barbara and University College London, and module encapsulation technologies developed by companies such as DuPont and 3M. Long-term field testing campaigns were organized in collaboration with utilities like Pacific Gas and Electric Company and research pilots supported by European Investment Bank programs.
Environmental assessments and life-cycle analyses have been published by teams at NREL, ETH Zurich, and University of Queensland, highlighting issues tied to indium and gallium supply chains analyzed by United States Geological Survey and trade studies from World Trade Organization-aligned economic research centers. Toxicology and workplace exposure guidelines relating to selenium compounds were informed by regulatory bodies such as World Health Organization and Occupational Safety and Health Administration, with remediation practices studied at University of British Columbia and University of Sydney. Recycling and material recovery initiatives have been piloted by consortia including European Commission projects and firms like Umicore.
Ongoing research directions are pursued at institutions such as MIT, Stanford University, NREL, Fraunhofer Society, Chinese Academy of Sciences, and Korea Institute of Science and Technology. Topics include perovskite–CIGS tandems investigated by teams at EPFL and University of Oxford, low-cost printing methods explored at Imperial College London and University of Cambridge, and advanced characterization using facilities at SLAC National Accelerator Laboratory and Diamond Light Source. Policy and market trajectories involving stakeholders like International Energy Agency and investors from BlackRock influence commercialization pathways. Future prospects depend on material supply strategies studied by US Department of Energy programs and international collaboration frameworks facilitated by United Nations initiatives.
Category:Semiconductors