NDLI: Harnessing the open-circuit voltage <i>via</i> a new series of Ru(ii) sensitizers bearing (<i>iso</i>-)quinolinyl pyrazolate ancillaries

Content Provider	Royal Society of Chemistry (RSC)
Author	Wu, Kuan-Lin Liu, Shih-Hung Palomares, Emilio Chi, Yun Grätzel, Michael Chou, Pi-Tai Nazeeruddin, Mohammad K. Ho, Shu-Te Clifford, John N. Ku, Wan-Ping
Copyright Year	2013
Abstract	A novel class of Ru(II) sensitizers (TFRS-51–TFRS-54) with a 4,4′-dicarboxy-2,2′-bipyridine anchoring ligand and two trans-oriented isoquinolinyl (or quinolinyl) pyrazolate ancillaries were designed, characterized and used to fabricate dye sensitized solar cell (DSC) devices. In sharp contrast to Ru(II) sensitizers that employ functionalized thiophene appendages in their ancillary bipyridal ligands, the extended π-conjugation introduced by the isoquinolinyl or quinolinyl groups improves the optical absorptivity, particularly for the absorption located at ∼500 nm when compared with the parent sensitizer TFRS-1 possessing less conjugated 5-pyrid-2-yl pyrazolate ancillaries. As a result, DSCs incorporated with these dyes show much improved JSC compared with the reference device. Moreover, the use of bulky t-butyl substituents on the ancillary ligands improves the cell performance with excellent VOC of up to 830 mV recorded. Also, the addition of tetra-n-butyl ammonium deoxycholate [TBA][DOC] as co-adsorbent to the dye solution further improves the power conversion efficiency (η). The best solar cell parameters recorded were JSC = 16.3 mA cm−2, VOC = 860 mV, FF = 0.72, and η = 10.1% for a device sensitized with TFRS-52. The markedly high open-circuit voltage is confirmed by the longer electron lifetime revealed in transient photovoltage (TPV) measurement versus the TFRS-1 sensitizer, and is probably derived from a combination of the higher conduction band edge of TiO2 induced by the in situ metathesis of carboxylate anchors and the reduced recombination contributed by the bulky sensitizer.
Starting Page	859
Ending Page	870
Page Count	12
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	6
Issue Number	3
Journal	Energy & Environmental Science
DOI	10.1039/c2ee23988d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	DSC JSC Bipyridine Ligand Dye Solar cell Thiophene Open-circuit voltage Ammonium Deoxycholic acid Valence and conduction bands Salt metathesis reaction Carrier generation and recombination
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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