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Cu 2 ZnSnS 4 thin film solar cells by fast coevaporation
Author(s) -
Schubert BjörnArvid,
Marsen Björn,
Cinque Sonja,
Unold Thomas,
Klenk Reiner,
Schorr Susan,
Schock HansWerner
Publication year - 2011
Publication title -
progress in photovoltaics: research and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.286
H-Index - 131
eISSN - 1099-159X
pISSN - 1062-7995
DOI - 10.1002/pip.976
Subject(s) - czts , kesterite , materials science , thin film , soda lime glass , solar cell , copper , molybdenum , substrate (aquarium) , evaporation , crystallite , analytical chemistry (journal) , chalcocite , sulfur , optoelectronics , metallurgy , chalcopyrite , chemistry , nanotechnology , composite material , geology , oceanography , physics , chromatography , thermodynamics
Abstract Solar cells based on kesterite‐type Cu 2 ZnSnS 4 (CZTS) were fabricated on molybdenum coated soda lime glass by evaporation using ZnS, Sn, Cu, and S sources. The coevaporation process was performed at a nominal substrate temperature of 550°C and at a sulfur partial pressure of 2–3 × 10 −3 Pa leading to polycrystalline CZTS thin films with promising electronic properties. The CZTS absorber layers were grown copper‐rich, requiring a KCN etch step to remove excess copper sulfide. The compositional ratios as determined by energy‐dispersive X‐ray spectroscopy (EDX) after the KCN etch are Cu/(Zn + Sn): 1.0 and Zn/Sn: 1.0. A solar cell with an efficiency of 4.1% and an open‐circuit voltage of 541 mV was obtained. Copyright © 2010 John Wiley & Sons, Ltd.