IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Surface Science Monday Sessions
       Session SS2-MoP

Paper SS2-MoP1
Effects of Na and Se Annealing on CuInSe2 Single Crystals

Monday, October 29, 2001, 5:30 pm, Room 134/135

Session: Surfaces and Interfaces Poster Session
Presenter: Y. Feldman, Weizmann Institute of Science, Israel
Authors: V. Lyakhovitskaya, Weizmann Institute of Science, Israel
K. Gartsman, Weizmann Institute of Science, Israel
Y. Feldman, Weizmann Institute of Science, Israel
H. Cohen, Weizmann Institute of Science, Israel
D. Cahen, Weizmann Institute of Science, Israel
Correspondent: Click to Email
We report on X-ray photoelectron spectroscopic, secondary ion mass spectroscopy, scanning electron microscopy, electron-beam induced current and energy dispersive X-ray fluorescence studies of high quality, travelling heater-grown single crystals of CuInse2, that were subjected to controlled heat treatments from 300 C upwards for varying times, in Se atmosphere, in Na atmosphere and in a mixture thereof. We find that with Na the surface of the crystals is gradually destroyed, while with Se a gradual topotactic type conversion takes place, controlled by Cu diffusion towards the surface, rather than by Se diffusion into the bulk. This is accompanied by formation of a separate Cu-Se phase on the surface. The implications of these findings for the effects of Na on the performance of CuInse2-based solar cells will be considered, in terms of both possible surface and bulk effects.