Title
Liquid phase crystallized silicon – A holistic absorber quality assessment
Date Issued
01 July 2018
Access level
open access
Resource Type
journal article
Author(s)
Institut für Silizium Photovoltaik
Publisher(s)
Elsevier B.V.
Abstract
In this paper, we report on the current status of absorber attributes in Liquid Phase Crystallized Silicon (LPC-Si) cells. To this end, an absorber doping series (ND = 2·1016/cm³ to 7·1017/cm³) and an absorber thickness variation (14 and 33 µm) are evaluated. Best cells from the batches for these series showed open circuit voltages up to 640 mV and fill factors above 70%. It is observed that for state-of-the-art cells, thicknesses over 15 µm are not beneficial due to limited diffusion lengths. Lower absorber doping concentrations tend to yield longer intra-grain diffusion lengths (Ldiff) and better passivated grain boundaries, which may be due to lower impurity precipitation. The longer Ldiff leads to higher short circuit current densities which over-compensate a decrease in open circuit voltage and fill factor with regards to efficiency. Both front and rear surfaces are sufficiently passivated and at the current status the bulk lifetime has most potential for improvement.
Start page
2
End page
8
Volume
181
Language
English
OCDE Knowledge area
Ingeniería de materiales
Subjects
Scopus EID
2-s2.0-85030852273
Source
Solar Energy Materials and Solar Cells
ISSN of the container
09270248
Sponsor(s)
The authors would like to thank Martina Trahms, Martin Muske, Rutger Schlatmann, Jan Haschke, Miha Filipič and Tim Frijnts for their help in fabrication, characterization and for fruitful discussions. M.B. and M.T. acknowledge financial support from the Slovenian Research Agency (Research Programme P2-0197 ).
Javna Agencija za Raziskovalno Dejavnost RS - P2-0197 -ARRS
Sources of information:
Directorio de Producción Científica
Scopus