Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 55, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.7567/JJAP.55.022304
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- New Energy and Industrial Technology Development Organization (NEDO) under the Ministry of Economy, Trade and Industry (METI)
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The surface oxidation condition of the Mo back contact on a soda lime glass (SLG) substrate was varied by air annealing and chemical etching. Then, the evolution of a photovoltaic property was studied for Cu(In, Ga)Se-2 (CIGS) solar cells grown by a three stage process with KF postdeposition treatment. Upon the removal of the oxidized layer from the Mo surface by chemical etching, the c-axis orientation of MoSe2 tended to be random, whereas the c-axis was perpendicular when the Mo surface was oxidized. An enhancement of the diffusion of Na and K from SLG to CIGS was observed upon removing the molybdenum oxide, which functions as a barrier to alkali-metal diffusion. The varied orientation of MoSe2 can also affect the alkali-metal diffusion kinetics. The open-circuit voltage (VOC) markedly increased after removing the oxidized layer from the Mo surface, mainly as a result of an increase in carrier density in CIGS. (C) 2016 The Japan Society of Applied Physics
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