Highly Efficient and Durable Quantum Dot Sensitized ZnO Nanowire Solar Cell Using Noble-Metal-Free Counter Electrode
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- 作者：Minsu Seol ; Easwaramoorthi Ramasamy ; Jinwoo Lee ; Kijung Yong
- 刊名：Journal of Physical Chemistry C
- 出版年：2011
- 出版时间：November 10, 2011
- 年：2011
- 卷：115
- 期：44
- 页码：22018-22024
- 全文大小：984K
- 年卷期：v.115,no.44(November 10, 2011)
- ISSN：1932-7455
文摘
A highly efficient quantum dot sensitized solar cell has been fabricated using a CdSe/CdS cosensitized ZnO nanowire array as a photoelectrode (PE), ordered mesocellular carbon foam (MSU-F-C) as a counter electrode (CE), and a polysulfide electrolyte as a hole transporter. The nanowire structure provides efficient photoelectron collection and light harvesting, and CdSe/CdS cosensitization allows utilization of the whole visible wavelength region of the incident solar spectrum. The MSU-F-C used here provides an extremely high surface area and the ordered large size mesopores with an interconnected pore structure, which facilitate diffusion of redox relay in the electrolyte. As a result, it exhibits low charge transfer resistance (Rct) between the CE/electrolyte interface and thus presents highly efficient photovoltaic performance, compared to conventional noble-metal-based CEs. The cell with MSU-F-C CE yields the highest power conversion efficiency of 3.60%, with Voc, Jsc, and FF of 685 mV, 12.6 mA/cm2, and 0.42, respectively. Furthermore, it exhibits high durability in the polysulfide electrolyte with remarkable stability irrespective of the solvent used in the electrolyte solution.