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ECN publication
Title:
Screen-printed ribbon growth on substrate solar cells exceeding 12% efficiency
 
Author(s):
Seren, S.; Hahn, G.; Huster, F.; Kopecek, R.; Gutjahr, A.; Burgers, A.R.; Schönecker, A.
 
Published by: Publication date:
ECN Solar Energy 1-6-2005
 
ECN report number: Document type:
ECN-RX--05-019 Conference Paper
 
Number of pages: Full text:
4 Download PDF  

Presented at: 20th European Photovoltaic Solar Energy Conference and Exhibition, Barcelona, Spain, 6-10 juni 2005.

Abstract:

Ribbon Growth on Substrate (RGS) solar cells have been processed at the University of Konstanz using an adapted industrial-type fire-through SiN process. Efficiencies above 12% have been reached on 5x5 cm2 cells processed from boron doped RGS material and efficiencies of 11% from gallium doped RGS material. These are the highest efficiencies obtained on this promising and cost-effective material using an industrial-type cell process. An important factor for the increase in efficiency is the reduced oxygen concentration of almost an order of magnitude in the current RGS wafer material compared to former RGS material. Enhanced Jsc, Voc, especially in case of the gallium doped RGS material, and Leff values in the range of 100 um as well as lifetimes above 4 us demonstrate the potential of the new low oxygen RGS materials. No additional bulk passivation steps have to be performed, a sufficient pasivation is guaranteed solely by hydrogen originating from a hydrogen rich SiNx antireflective coating 1 mA/cm2 enabling efficiencies close to 13% using material of current quality.


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