TY - JOUR
T1 - Molecularly engineered Ru(II) sensitizers compatible with cobalt(II/III) redox mediators for dye-sensitized solar cells
AU - Wu, Kuan Lin
AU - Huckaba, Aron J.
AU - Clifford, John N.
AU - Yang, Ya Wen
AU - Yella, Aswani
AU - Palomares, Emilio
AU - Grätzel, Michael
AU - Chi, Yun
AU - Nazeeruddin, Mohammad Khaja
N1 - Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/8/1
Y1 - 2016/8/1
N2 - Thiocyanate-free isoquinazolylpyrazolate Ru(II) complexes were synthesized and applied as sensitizers in dye-sensitized solar cells (DSCs). Unlike most other successful Ru sensitizers, Co-based electrolytes were used, and resulting record efficiency of 9.53% was obtained under simulated sunlight with an intensity of 100 mW cm-2. Specifically, dye 51-57dht.1 and an electrolyte based on Co(phen)3 led to measurement of a JSC of 13.89 mA cm-2, VOC of 900 mV, and FF of 0.762 to yield 9.53% efficiency. The improved device performances were achieved by the inclusion of 2-hexylthiophene units onto the isoquinoline subunits, in addition to lengthening the perfluoroalkyl chain on the pyrazolate chelating group, which worked to increase light absorption and decrease recombination effects when using the Co-based electrolyte. As this study shows, Ru(II) sensitizers bearing sterically demanding ligands can allow successful utilization of important Co electrolytes and high performance.
AB - Thiocyanate-free isoquinazolylpyrazolate Ru(II) complexes were synthesized and applied as sensitizers in dye-sensitized solar cells (DSCs). Unlike most other successful Ru sensitizers, Co-based electrolytes were used, and resulting record efficiency of 9.53% was obtained under simulated sunlight with an intensity of 100 mW cm-2. Specifically, dye 51-57dht.1 and an electrolyte based on Co(phen)3 led to measurement of a JSC of 13.89 mA cm-2, VOC of 900 mV, and FF of 0.762 to yield 9.53% efficiency. The improved device performances were achieved by the inclusion of 2-hexylthiophene units onto the isoquinoline subunits, in addition to lengthening the perfluoroalkyl chain on the pyrazolate chelating group, which worked to increase light absorption and decrease recombination effects when using the Co-based electrolyte. As this study shows, Ru(II) sensitizers bearing sterically demanding ligands can allow successful utilization of important Co electrolytes and high performance.
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U2 - 10.1021/acs.inorgchem.6b00427
DO - 10.1021/acs.inorgchem.6b00427
M3 - Article
AN - SCOPUS:84980030879
SN - 0020-1669
VL - 55
SP - 7388
EP - 7395
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 15
ER -