TY - JOUR
T1 - Panchromatic Ru(ıı) sensitizers bearing single thiocyanate for high efficiency dye sensitized solar cells
AU - Wang, Sheng-Wei
AU - Chou, Chun-Cheng
AU - Hu, Fa-Chun
AU - Wu, Kuan-Lin
AU - Chi, Yun
AU - Clifford, John N.
AU - Palomares, Emilio
AU - Liu, Shih-Hung
AU - Chou, Pi-Tai
AU - Wei, Tzu-Chien
AU - Hsiao, Ting-Yun
PY - 2014/11/7
Y1 - 2014/11/7
N2 - We report on a new series of Ru(ıı) sensitizers PRT-21-PRT-24 suitable for high performance dye sensitized solar cells (DSCs). Their molecular design consists of a tridentate anchor, a bidentate pyrazolate ancillary and a single thiocyanate. On this architecture, we examined two types of anchor, incorporating the traditional 4,4′4′′-tricarboxy-2,2′:6′,2′′-terpyridine (i.e. tctpy) and newly evaluated 4,4′-dicarboxy-6-quinolin-8-yl-2,2′-bipyridine (i.e. Qbpy). This modification, along with the synergistic incorporation of either 5-hexylthien-2-yl or 5-(hexylthio)thien-2-yl substituent at the 4-position of the pyridyl pyrazolate chelate for enhancing the optical response, leads to the achievement of DSC with a prominent JSC of 20.4 mA cm-2 and VOC = 740 mV, and thus a high photon conversion efficiency of 11.16% using PRT-22. Comprehensive charge extraction, transient photovoltage and transient absorption measurements have been carried out to gain an insight into the fundamental mechanism of these new dyes and the associated device properties. These panchromatic Ru(ıı) sensitizers offer better product yields, higher stability and lower synthetic costs compared to that of black dye (N749), adding another dimension for better sensitizers en route to high performance DSCs.
AB - We report on a new series of Ru(ıı) sensitizers PRT-21-PRT-24 suitable for high performance dye sensitized solar cells (DSCs). Their molecular design consists of a tridentate anchor, a bidentate pyrazolate ancillary and a single thiocyanate. On this architecture, we examined two types of anchor, incorporating the traditional 4,4′4′′-tricarboxy-2,2′:6′,2′′-terpyridine (i.e. tctpy) and newly evaluated 4,4′-dicarboxy-6-quinolin-8-yl-2,2′-bipyridine (i.e. Qbpy). This modification, along with the synergistic incorporation of either 5-hexylthien-2-yl or 5-(hexylthio)thien-2-yl substituent at the 4-position of the pyridyl pyrazolate chelate for enhancing the optical response, leads to the achievement of DSC with a prominent JSC of 20.4 mA cm-2 and VOC = 740 mV, and thus a high photon conversion efficiency of 11.16% using PRT-22. Comprehensive charge extraction, transient photovoltage and transient absorption measurements have been carried out to gain an insight into the fundamental mechanism of these new dyes and the associated device properties. These panchromatic Ru(ıı) sensitizers offer better product yields, higher stability and lower synthetic costs compared to that of black dye (N749), adding another dimension for better sensitizers en route to high performance DSCs.
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U2 - 10.1039/c4ta04483e
DO - 10.1039/c4ta04483e
M3 - RGC 21 - Publication in refereed journal
SN - 2050-7488
VL - 2
SP - 17618
EP - 17627
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 41
ER -
