Photodarkening in amorphousGe1−xSn

Abstract

Photodarkening experiments have been performed on evaporated films of Gel Sn Se2 in the composition range 0& x ~0.60 at 78 K. Thermal cycling between room temperature and 78 K was observed to reduce the optical absorption of the films. The photodarkening response is slightly enhanced at x =0.1 but is suppressed for higher Sn concentrations.Chalcogenide glasses such as amorphous GeSe2, As2S3, and similar compounds display an intriguing property known as "photodarkening. " %'hen exposed to light of energy near or above the band gap, they undergo a

Atomic structure and bonding properties in amorphous Cu (As2S3)1− by ab initio molecular-dynamics simulations

“…However, in spite of considerable efforts over the past years, and the presentation of a wide range of proposed models, no generally accepted view of the underlying processes has been emerged. It is known that the photodarkening which is normally observed in chalcogenide glasses are suppressed by the addition of metals such as Cu [8], Pb [9] and Sn [10]. However, the precise nature of the mechanism that gives rise to these phenomena still remains elusive [11].…”

Photoinduced changes in optical properties of Ga–Sb–Ge–Se glasses

“…Since the transmission through the thin film decreases by exposure it is clear that there is no possibility of formation of cracks and pinholes in the films [18].…”

Effects of Cu alloying on the structural and electronic properties in amorphousCux(As0.4S0.6)1−Shimojo1, Aniya2 2006Phys. Rev. B2000View full textAdd to dashboardCite

“…11 It is known that photodarkening is suppressed by the addition of a small amount ͑1-5%͒ of metals such as Cu, 12 Pb, 13 and Sn. 14 These observations indicate that the electronic properties of amorphous chalcogenides are closely related to the structure of atoms. However, in spite of considerable efforts over the past years, and the presentation of a wide range of proposed models, the precise nature of the mechanism that gives rise to these phenomena still remains elusive.…”