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Common buffer materials used with CuInGaSe 2 (CIGS) absorbers produce conduction-band barriers that may significantly distort the current–voltage (J–V) curves, especially when short-wavelength photons are excluded from the illumination spectrum. Earlier work documented this effect for CuInSe 2 (CIS) absorbers (band gap near 1.0 eV) with CdS buffers. Higher band-gap (∼1.15 eV) CIGS...
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