Title :
The influence of Na on elements diffusion of Cu(In,Ga)Se2 thin films
Author :
Weilong, Jiang ; Li, Zhang ; Qing, He ; Fengyan, Li ; Zhiqiang, Zhou ; Wei, Liu ; Baozhang, Li ; Changjian, Li ; Yun, Sun
Author_Institution :
Institute of Photo-electronics, Nankai University, Tianjin, China
Abstract :
The influence of Na on structural properties of Cu(In,Ga)Se2 thin films on polyimide(PI) substrate by low temperature 3-stage coevaporation process is investigated. The interdiffusion of In and Ga is hindered in the presence of Na and lead to a decrease of grain size of CIGS near the substrate. Double-peak reflections are found in XRD data of CIGS thin films on substrates with Na. GIXRD data is used and shows a decrease of Ga-incorporation with depth. The problem above can be partly solved by reducing Ga/In ratio. Cross-section SEM micrograph of CIGS films grown with Na shows a smaller grain size near the substrate.
Keywords :
Grain size; Helium; Optical films; Optical reflection; Photovoltaic cells; Sputtering; Substrates; Temperature; Transistors; X-ray scattering;
Conference_Titel :
Photovoltaic Specialists Conference, 2008. PVSC '08. 33rd IEEE
Conference_Location :
San Diego, CA, USA
Print_ISBN :
978-1-4244-1640-0
Electronic_ISBN :
0160-8371
DOI :
10.1109/PVSC.2008.4922550
