What Is CIGS (Copper Indium Gallium Selenide)?
CIGS is a quaternary semiconductor made from copper, indium, gallium, and selenium and used mainly as a light-absorbing layer in thin-film photovoltaic devices. Its importance comes from a high optical absorption coefficient and a tunable bandgap, so a very thin coating can capture a large fraction of incoming sunlight and convert it into charge carriers.
In photovoltaic textile fibers, CIGS offers attractive electrical performance because it can work on lightweight substrates and does not require the thickness of crystalline silicon wafers. The challenge is mechanical rather than electronic: polycrystalline CIGS layers can form microcracks when bent repeatedly, which raises recombination losses and reduces long-term output.
A useful relation is that the effective bandgap can be tuned to roughly 1.0-1.7 eV by changing the gallium content. Why it matters is that this range aligns well with the solar spectrum, helping designers balance voltage, current, and absorber thickness in portable or lightweight photovoltaic systems.
Used in devices include thin-film solar modules, lightweight charging panels, and building-integrated photovoltaic laminates. Engineers monitor grain structure, defect density, substrate strain, and contact stability because those factors determine whether a high-efficiency absorber remains electrically reliable outside the laboratory.
Example:
A flexible charger using a thin CIGS coating can generate useful power while staying far lighter than an equivalent rigid silicon panel.
Related Terms:
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