Cu-Based Metal鈥揙rganic Frameworks for Photovoltaic Application

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• 作者：Deok Yeon Lee ; Dipak V. Shinde ; Seog Joon Yoon ; Keum Nam Cho ; Wonjoo Lee ; Nabeen K. Shrestha ; Sung-Hwan Han
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：July 31, 2014
• 年：2014
• 卷：118
• 期：30
• 页码：16328-16334
• 全文大小：340K
• ISSN：1932-7455

文摘

In the present study, a thin layer of Cu-based metal鈥搊rganic frameworks (MOFs, copper(II) benzene-1,3,5-tricarboxylate) is fabricated using a layer-by-layer technique, and the layer is investigated as a light-absorbing layer in TiO₂-based solar cells. Iodine doping of the MOFs is performed to improve the conductivity and charge-transfer reaction across the TiO₂/MOF/electrolyte interface. The HOMO and LUMO energy states of the MOF films are estimated to be 鈭?.37 and 鈭?.82 eV (vs vacuum), respectively, which show a well-matched energy cascade with TiO₂. For the first time, a TiO₂-based solar cell is fabricated successfully using iodine-doped Cu-MOFs as an active layer, demonstrating a cell performance with J_sc = 1.25 mA cm^鈥? and Eff = 0.26% under illumination of 1 sun radiation. In contrast, the cell with an undoped MOF layer exhibited J_sc = 0.05 mA cm^鈥? and Eff = 0.008%. Electrochemical impedance spectroscopy of the cells suggests that iodine doping significantly reduces the charge-transfer resistance.