DocumentCode :
1602663
Title :
Progress in silicon heterojunction solar cell fabrication with rear laser-fired contacts
Author :
Morales-Vilches, A. ; Voz, C. ; Colina, M. ; Lopez, German ; Martin, I. ; Orpella, A. ; Puigdollers, J. ; Garcia, M.A. ; Alcubilla, R.
Author_Institution :
Dept. d´Eng. Electron., Univ. Politec. de Catalunya, Barcelona, Spain
fYear :
2013
Firstpage :
345
Lastpage :
348
Abstract :
Silicon Heterojunction (SHJ) solar cells are one of the most promising alternatives for high efficiency industrially feasible solar cells. The structure of these devices is based on hydrogenated amorphous silicon (a-Si:H) layers deposited at low temperature on crystalline silicon (c-Si) substrates. This fabrication process reduces the thermal stress on the substrate and is compatible with thinner wafers. In this work, we present our recent progress in the fabrication of SHJ solar cells on p-type c-Si wafers. The deposition conditions of hydrogenated amorphous silicon-carbon (a-SiCx:H) layers obtained by Plasma Enhanced Chemical Vapor Deposition (PECVD) are optimized. We have also applied a novel laser-firing process to contact the rear side of the fabricated devices. In this way, solar cells with point contacts through rear passivating layers can be fabricated without any photolithographic step. Recently, our group has obtained a remarkable conversion efficiency of 17.2 % on 1 cm2 SHJ solar cells fabricated in a fully low temperature process.
Keywords :
amorphous semiconductors; carbon; laser deposition; plasma CVD; point contacts; semiconductor heterojunctions; silicon compounds; solar cells; thermal stresses; SHJ solar cells; Si; SiCx:H; crystalline silicon substrates; efficiency 17.2 percent; fully low temperature process; high efficiency industrially feasible solar cells; hydrogenated amorphous silicon layer; hydrogenated amorphous silicon-carbon layers; p-type c-silicon wafers; passivating layers; plasma enhanced chemical vapor deposition; point contacts; rear laser-fired contact process; silicon heterojunction solar cell fabrication process; thermal stress; Fabrication; Heterojunctions; Photovoltaic cells; Silicon; Substrates; Surface emitting lasers; Surface treatment; heterojunction; passivation; solar cells plasma enhanced chemical vapor deposition;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electron Devices (CDE), 2013 Spanish Conference on
Conference_Location :
Valladolid
Print_ISBN :
978-1-4673-4666-5
Electronic_ISBN :
978-1-4673-4667-2
Type :
conf
DOI :
10.1109/CDE.2013.6481413
Filename :
6481413
Link To Document :
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