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Title:
 
Voltage Dependent Photocurrent in Low-Temperature Deposited CIGSe Solar Cells
 
Author(s):
 
S. Puttnins, H. Kempa, S. Englisch, R. Karsthof, F. Daume, A. Rahm, A. Braun, M. Grundmann
 
Keywords:
 
Sodium, Quantum Efficiency, Cu (InGa) Se2
 
Topic:
 
THIN FILM SOLAR CELLS
Subtopic: CdTe, CIS and Related Ternary and Quaternary Thin Film Solar Cells
Event: 28th European Photovoltaic Solar Energy Conference and Exhibition
Session: 3BV.6.49
 
Pages:
 
2438 - 2442
ISBN: 3-936338-33-7
Paper DOI: 10.4229/28thEUPVSEC2013-3BV.6.49
 
Price:
 
 
0,00 EUR
 
Document(s): paper
 

Abstract/Summary:


Sodium plays a key role for the optimization of Cu(In,Ga)Se2 (CIGSe) solar cell efficiency. This contribution analyzes the losses causing the efficiency drop for sodium contents above the optimum content. We show that the efficiency is reduced due to reduced fill factors and short circuit currents. Both effects can be attributed to losses in voltage dependent carrier collection. By means of voltage dependent quantum efficiency measurement we show that too high of a sodium content leads primarily to enhanced recombination in the neutral region of the absorber. At very high sodium content we observe additional losses at the CIGSe/CdS interface.