Direct optical band gap measurement in polycrystalline semiconductors: A critical look at the Tauc method

Towards efficient band structure and effective mass calculations for III-V direct band-gap semiconductors

The band structures and effective masses of III-V semiconductors InP, InAs, InSb, GaAs, and GaSb are calculated using the GW method, the Heyd, Scuseria, and Ernzerhof hybrid functional, and modified BeckeJohnson combined with the local-density approximation MBJLDA —a local potential optimized for the description of the fundamental band gaps F. Tran and P. Blaha, Phys. Rev. Lett. 102, 226401 200...

a critical look at kant’s ethics

kant’s ethical theory is one the most important theories in philosophy of ethics, which has always attracted the attention of the commentators and critics. although it has many positive points, there are some objections to this theory just as to any other human theory. in this article, it is attempted to point out the critiques that seem to have been leveled against kant’s ethics. some of these...

Workshop on Defects in Wide Band Gap Semiconductors

Defects, Impurities and Doping Levels in Wide-Band-Gap Semiconductors

A fundamental understanding of the mechanisms governing the behavior of defects and impurities is essential to control doping in semiconductors. Wide-band-gap semiconductors, in particular, often exhibit doping-related problems. We discuss how rst-principles theoretical techniques can be applied to the calculation of formation energies and concentrations of native defects and dopant impurities....

Codoping Method for Solutions of Doping Problems in Wide-Band-Gap Semiconductors

We propose a codoping method of using acceptors and donors simultaneously as a solution to the crucial doping problem, or unipolarity, of wide-band-gap semiconductors which exhibit an asymmetry in their ability to be doped as n-type or p-type. The deliberate codoping of donors is essential for the enhancement of acceptor incorporation, decrease of the binding energy of the acceptor impurity and...