Highly Efficient Dye‐Sensitized Solar Cells Based on Panchromatic Ruthenium Sensitizers with Quinolinylbipyridine Anchors

Abstract

Panchromatic Ru II sensitizers TF-30-TF-33 bearing a new class of 6-quinolin-8-yl-2,2'-bipyridine anchor were synthesized and tested under AM1.5 G simulated solar irradiation. Their increased p conjugation relative to that of the traditional 2,2':6',2''-terpyridine-based anchor led to a remarkable improvement in absorptivity across the whole UV-Vis-NIR spectral regime. Furthermore, the introduction of a bulky tert-butyl substituent on the quinolinyl fragment not only led to an increase in the J SC value owing to the suppression of dye aggregation, but remarkably also resulted in no loss in V OC in comparison with the reference sensitizer containing a tricarboxyterpyridine anchor. The champion sensitizer in DSC devices was found to be TF-32 with a performance of J SC = 19.2 mA cm À2 , V OC = 740 mV, FF = 0.72, and h = 10.19 %. This 6-quinolin-8-yl-2,2'-bipyridine anchor thus serves as a prototype for the next generation of Ru II sensitizers with any tridentate ancillary.

Low‐Cost TiS2 as Hole‐Transport Material for Perovskite Solar Cells

“…With a generic formula of ABX 3, where A is generally an organic cation (CH 3 NH 3 + ; CH 3 (NH 2 ) 2 + ), B a divalent metal (Pb +2 , Sn +2 ), and X a halide (Cl − , Br − , I − ), they exhibit a unique combination of properties that grants exceptional performance in multiple applications. Among others, high absorption coefficient, high carrier mobility, long carrier diffusion length, simple bandgap tunability, and a sharp optical bandgap edge make them suitable for applications ranging from solar cells to photodetectors, lasing, and light emitting diodes . In the last few years, high‐efficiency photovoltaic devices have been fabricated using a variety of configurations, deposition methods, and perovskite compositions, in order to improve the crystallization and charge carrier extraction within the cell.…”

Synthesis and Characterization of a Series of Bis-homoleptic Cycloruthenates with Terdentate Ligands as a Family of Panchromatic Dyes

“…The choice was based on their oxidation potential, about 0.9 V vs NHE, which appeared similar to efficient ruthenium dyes using terdentate ligands, between 0.8 and 1 V vs NHE. 14,16,44,60,61 This gave us one complex with four acid moieties, 10, and one complex with only two acid moieties, 11.…”

Rational molecular engineering of cyclopentadithiophene-bridged D-A-π-A sensitizers combining high photovoltaic efficiency with rapid dye adsorption

“…Our main motivation is to look for a sensitizer holding the capability of panchromatic coverage and particularly efficient electron conversion. In this work, we make a rational molecular design on the component in the sensitizer framework for the sake of keeping the synergistic enhancement of J SC and V OC 39 40 41 : i) A powerful electron donating group of indoline pushes the photoexcitation electron vigorously through the molecular channel to the internal TiO 2 nanoparticles, ii) the auxiliary electron-withdrawing unit BTD extends the spectral response and weakens the blue shift on TiO 2 films, and iii) the enlarged π-conjugation bridge of CPDT with long alkyl chain further extends the response wavelength, enhances the light harvesting capability, and blocking aggregation for free co-sensitization.…”