Enhanced Electrocatalytic Activity of the Annealed Cu2-xS Counter Electrode for Quantum Dot-Sensitized Solar Cells

Title
Enhanced Electrocatalytic Activity of the Annealed Cu2-xS Counter Electrode for Quantum Dot-Sensitized Solar Cells
Author(s)
이수용박민아김재홍김현수[김현수]최철종[최철종]이도경[이도경]안광순
Keywords
CDSE; NANOTUBES; FILMS
Issue Date
201311
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.160, no.11, pp.H847 - H851
Abstract
Cu2-xS films in situ formed on brass substrates were annealed at different temperatures (100, 200, 300, and 400 degrees C) in flowing Ar gas, and introduced as the counter electrodes (CEs) for CdSe quantum dot-sensitized solar cells (QD-SSCs). The QD-SSC with the bare Cu2-xS CE exhibited higher cell performance than that with the Pt CE. The QD-SSC with the 300 degrees C-annealed Cu2-xS CE achieved the best energy conversion efficiency of 4.25%, showing a 34% increase compared to the cell performance of that with the bare Cu2-xS CE. This is because the Cu2-xS film annealed at 300 degrees C provided rapid charge transport and the increased electrochemical active sites due to the improved crystallinity and surface roughening, leading to significantly enhanced electrocatalytic activity. On the other hand, when the Cu2-xS film was annealed at 400 degrees C, secondary phases, such as CuO, Cu2O, CuSO4 and ZnO, formed., which reduced the cell performance of the QD-SSC with the 400 degrees C-annealed Cu2-xS CE due to the poor electrocatalytic activity. (C) 2013 The Electrochemical Society. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/28602http://dx.doi.org/10.1149/2.115311jes
ISSN
0013-4651
Appears in Collections:
중앙도서관 > rims journal
공과대학 > 화학공학부 > Articles
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