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Title:
 
Laser Ablation Process for Rear-Side Contact Preparation of Photovoltaic Films Based on CZTS Powder
 
Author(s):
 
G. Peharz, V. Satzinger, P. Krabb, A. Neisser
 
Keywords:
 
Contact, Laser Processing, CZTS
 
Topic:
 
THIN FILM SOLAR CELLS AND MODULES
Subtopic: CdTe, CIS and Related Ternary and Quaternary Thin Film Solar Cells and Modules
Event: 31st European Photovoltaic Solar Energy Conference and Exhibition
Session: 3DV.1.14
 
Pages:
 
1207 - 1209
ISBN: 3-936338-39-6
Paper DOI: 10.4229/EUPVSEC20152015-3DV.1.14
 
Price:
 
 
0,00 EUR
 
Document(s): paper, poster
 

Abstract/Summary:


A unique approach for producing photovoltaic foils has been developed by the company crystalsol. The technology is based on quaternary mono crystalline Cu2ZnSnS4 semiconductor grains (CZTS) embedded in a polymer film. The embedded grains need to be excavated and the buffer layer on the grains needs to be removed before back contact application. This can be done by applying a mechanical abrasion process such as polishing. In this work we present first results on an alternative process which relies on laser ablation. A laser process based on a ultrafast fs-laser proved to be very feasible for this application and fully functional solar cell devices could be manufactured. Moreover the laser process was much better controllable and allowed a well-defined ablation of the rear side of the photovoltaic film. In addition another laser process was tested which relies on a nanosecond-laser source. In contrast to the fs-laser process the grains are locally melting when treated with the ns-laser source. Also the electrical properties of solar cell devices are poorer than these of devices made with the reference polishing process.