Lifetime improvement after phosphorous diffusion gettering on upgraded metallurgical grade silicon

Peral Boiza, Ana and Míguez, José Manuel and Ordás, Ramón and Cañizo Nadal, Carlos del (2014). Lifetime improvement after phosphorous diffusion gettering on upgraded metallurgical grade silicon. "Solar Energy Materials and Solar Cells" ; ISSN 0927-0248. https://doi.org/10.1016/j.solmat.2014.02.026.

Description

Title: Lifetime improvement after phosphorous diffusion gettering on upgraded metallurgical grade silicon
Author/s:
  • Peral Boiza, Ana
  • Míguez, José Manuel
  • Ordás, Ramón
  • Cañizo Nadal, Carlos del
Item Type: Article
Título de Revista/Publicación: Solar Energy Materials and Solar Cells
Date: 2014
ISSN: 0927-0248
Subjects:
Freetext Keywords: Solar grade Silicon, Upgraded Metallurgical Silicon, Phosphorus Diffusion Gettering
Faculty: Instituto de Energía Solar (IES) (UPM)
Department: Otro
UPM's Research Group: Silicio y Nuevos Conceptos para Células Solares
Creative Commons Licenses: Recognition - Non commercial - Share

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Abstract

Wide experimental evidence of the phosphorus diffusion gettering beneficial effect on solar grade silicon is found by measuring electron effective lifetime and interstitial iron concentration in as-grown and post processed samples from two ingots of upgraded metallurgical grade silicon produced by Ferrosolar. Results after two different P-diffusion processes are compared: P emitter diffusion at 850ºC followed by fast cool-down (called “standard process”) or followed by slow cool-down (called “extended process”). It is shown that final lifetimes of this low cost material are in the range of those obtained with conventional material. The extended process can be beneficial for wafers with specific initial distribution and concentration of iron, e.g. materials with high concentration of big Fe precipitates, while for other cases the standard process is enough efficient. An analysis based on the comparison of measured lifetime and dissolved iron concentration with theoretical calculations helps to infer the initial iron distribution and concentration, and according to that, choose the more effective type of gettering.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainTEC2011-28423-C03UnspecifiedUnspecifiedUnspecified

More information

Item ID: 29996
DC Identifier: http://oa.upm.es/29996/
OAI Identifier: oai:oa.upm.es:29996
DOI: 10.1016/j.solmat.2014.02.026
Deposited by: Profesor Titular Carlos del Cañizo Nadal
Deposited on: 18 Jun 2014 10:08
Last Modified: 11 Apr 2019 10:23
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