What Is The Role Of Defects In The Band Gap Of CdSe?

Defects in CdSe can affect its band gap by introducing electronic states within the band gap. Intrinsic defects, such as vacancies or interstitial atoms, can create localized states that can trap electrons or holes, causing a reduction in the effective band gap. Extrinsic dopants, such as impurities intentionally introduced during synthesis, can also introduce energy levels within the band gap, altering its size and shape. The type and concentration of defects present in CdSe can therefore significantly impact its optical and electronic properties, making defect control an important consideration in the development of CdSe-based optoelectronic devices.