Layer-by-layer deposition and photovoltaic property of Ru-based metal-organic frameworks

Deok Yeon Lee, Eun Kyung Kim, Chan Yong Shin, Dipak V. Shinde, Wonjoo Lee, Nabeen K. Shrestha, Joong Kee Lee, Sung Hwan Han

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

In the present work, thin films of ruthenium based metal-organic frameworks are synthesized using a layer-by-layer (LbL) technique and the film is characterized using XRD, FE-SEM, UV/visible spectroscopy, cyclic voltammetry and photoluminance spectroscopy. Further, the feasibility of the MOF film as a sensitizer in a solar cell is investigated. The HOMO-LUMO level of the frameworks is estimated and is found to be suitable to allow the use of the frameworks as a sensitizer for TiO2. When TiO2 mesoporous film is sensitized with the LBL thin film of the frameworks and a Grätzel type liquid junction solar cell is constructed, it demonstrates the cell performance of Isc = 2.56 mA cm-2, Voc = 0.63 V, FF = 0.63, and Eff = 1.22%. Photoluminescence spectroscopy and electrochemical impedance spectroscopy show that iodine doping into the frameworks is essential to facilitate the photogenerated electron transfer from the frameworks to TiO2.

Original languageEnglish
Pages (from-to)12037-12042
Number of pages6
JournalRSC Advances
Volume4
Issue number23
DOIs
StatePublished - 2014

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