CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

The effect of Se/Te ratio on transient absorption behavior and nonlinear absorption properties of CuIn0.7Ga0.3(Se1-xTex)(2) (0 <= x <= 1) amorphous semiconductor thin films

A. Karatay ; Betül Kücüköz (Institutionen för kemi och kemiteknik, Fysikalisk kemi) ; G. Cankaya ; A. Ates ; A. Elmali
Optical Materials (0925-3467). Vol. 73 (2017), NOV, p. 20-24.
[Artikel, refereegranskad vetenskaplig]

The characterization of the CuInSe2 (CIS), CuInGaSe (CIGS) and CuGaSe2 (CGS) based semiconductor thin films are very important role for solar cell and various nonlinear optical applications. In this paper, the amorphous CuIn0.7Ga0.3(Se1-xTex)(2) semiconductor thin films (0 <= x <= 1) were prepared with 60 nm thicknesses by using vacuum evaporation technique. The nonlinear absorption properties and ultrafast transient characteristics were investigated by using open aperture Z-scan and ultrafast pump-probe techniques. The energy bandgap values were calculated by using linear absorption spectra. The bandgap values are found to be varying from 0.67 eV to 1.25 eV for Culn(0.7)Ga(0.3)Te(2), Culn(0.7)Ga(0.3)Se(1.6)Te(0.4), Culn(0).7Ga0.3Se1-xTe1.6 and Culn(0.7)Ga(0.3)Se(2) thin films. The energy bandgap values decrease with increasing telluride (Te) doping ratio in mixed Culn(0.7)Ga(0.3)(Se1-xTex)(2) films. This affects nonlinear characteristics and ultrafast dynamics of amorphous thin films. Ultrafast pump-probe experiments indicated that decreasing of bandgap values with increasing the Te amount switches from the excited state absorption signals to ultrafast bleaching signals. Open aperture Z-scan experiments show that nonlinear absorption properties enhance with decreasing bandgaps values for 65 ps pulse duration at 1064 nm. Highest nonlinear absorption coefficient was found for Culn(0.7)Ga(0.3)Te(2) thin film due to having the smallest energy bandgap. (C) 2017 Elsevier B.V. All rights reserved.

Nyckelord: Semiconductor, Nonlinear absorption, Z-scan, Ultrafast pump-probe, Amorphous thin films, saturable-absorber mirror, solar-cells, improved performance, annealing, temperature, tellurium te, laser, selenization, precursors, deposition, growth, Materials Science, Optics



Den här publikationen ingår i följande styrkeområden:

Läs mer om Chalmers styrkeområden  

Denna post skapades 2017-12-13.
CPL Pubid: 253738

 

Läs direkt!


Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Fysikalisk kemi

Ämnesområden

Building Futures
Hållbar utveckling
Kemi
Kemiteknik

Chalmers infrastruktur