Enhanced Electrocatalytic Activity of the Annealed Cu2-xS Counter Electrode for Quantum Dot-Sensitized Solar Cells
Enhanced Electrocatalytic Activity of the Annealed Cu2-xS Counter Electrode for Quantum Dot-Sensitized Solar Cells
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DOI：
10.1149/2.115311jes
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发表时间：
2013
影响因子：
3.9
通讯作者：
Soo-Yong Lee;Min‐Ah Park;Jae Hong Kim;Hyunsoo Kim;Chel-Jong Choi;Do-Kyung Lee;Kwang-soon Ahn
中科院分区：
文献类型：
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作者：
Soo-Yong Lee;Min‐Ah Park;Jae Hong Kim;Hyunsoo Kim;Chel-Jong Choi;Do-Kyung Lee;Kwang-soon Ahn
在流动的Ar气中，对黄铜衬底上原位生长的Cu 2-xS薄膜进行了不同温度（100、200、300和400 ℃）的退火处理，并将其引入作为CdSe量子点敏化太阳能电池（QD-SSCs）的对电极.与裸Cu 2-x S CE相比，具有裸Cu 2-x S CE的QD-SSC表现出更高的电池性能。采用300 C退火的Cu 2-x S CE的QD-SSC实现了4.25%的最佳能量转换效率，与裸Cu 2-x S CE的电池性能相比，显示出34%的提高。这是因为在300 ℃下退火的Cu 2-xS膜由于结晶度的提高和表面粗糙化而提供了快速的电荷传输和增加的电化学活性位点，导致电催化活性显著增强。另一方面，当Cu 2-xS薄膜在400 C退火时，形成了CuO，Cu 2 O，CuSO 4和ZnO等第二相，这降低了QD-SSC的电催化活性。
Cu 2-x S films in situ formed on brass substrates were annealed at different temperatures (100, 200, 300, and 400 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 Cu 2-x S CE exhibited higher cell performance than that with the Pt CE. The QD-SSC with the 300 C-annealed Cu 2-x S CE achieved the best energy conversion efficiency of 4.25%, showing a 34% increase compared to the cell performance of that with the bare Cu 2-x S CE. This is because the Cu 2-x S film annealed at 300 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 Cu 2-x S film was annealed at 400 C, secondary phases, such as CuO, Cu 2 O, CuSO 4 and ZnO, formed, which reduced the cell performance of the QD-SSC with the 400 C-annealed Cu 2-x S CE due to the poor electrocatalytic activity.