TY - JOUR
T1 - Analysis of selenization in supercritical ethanol for the production of compound semiconductor films
AU - Tomai, Takaaki
AU - Yanaka, Miki
AU - Honma, Itaru
N1 - Funding Information:
This work was financially supported by Takahashi Industrial and Economic Research Foundation , and Japan Science and Technology Agency (JST) Center for Revitalization Promotion , A-step feasibility study program (241FT0051).
Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013
Y1 - 2013
N2 - Selenization is an essential reaction for the production of the metal selenide absorption layer in compound semiconductor thin-film solar cells. Application of supercritical ethanol facilitates the conversion from a Cu-In film to a CuInSe2 film at a low temperature of 300 C. In this study, we investigate the contribution of supercritical alcohols to the selenization reaction by employing some kinds of supercritical alcohol media with different reduction powers. We found that the high reduction power of ethanol is necessary for selenization without excess selenium deposition at low temperature. Moreover, 1H NMR analysis revealed that at supercritical conditions, decomposition of diethyl selenide occurs and reactive selenium species with a short lifetime at process temperatures dictate the selenization reaction, whereas stable selenium species prevent the deposition of excess selenium.
AB - Selenization is an essential reaction for the production of the metal selenide absorption layer in compound semiconductor thin-film solar cells. Application of supercritical ethanol facilitates the conversion from a Cu-In film to a CuInSe2 film at a low temperature of 300 C. In this study, we investigate the contribution of supercritical alcohols to the selenization reaction by employing some kinds of supercritical alcohol media with different reduction powers. We found that the high reduction power of ethanol is necessary for selenization without excess selenium deposition at low temperature. Moreover, 1H NMR analysis revealed that at supercritical conditions, decomposition of diethyl selenide occurs and reactive selenium species with a short lifetime at process temperatures dictate the selenization reaction, whereas stable selenium species prevent the deposition of excess selenium.
KW - Compound semiconductor
KW - Conversion reaction
KW - Selenization
KW - Solar cells
KW - Supercritical alcohol
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U2 - 10.1016/j.supflu.2013.08.013
DO - 10.1016/j.supflu.2013.08.013
M3 - Article
AN - SCOPUS:84884579069
VL - 83
SP - 41
EP - 46
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
SN - 0896-8446
ER -