Narrowing band gap of platinum acetylide dye-sensitized solar cell sensitizers with thiophene π-bridges

Abstract

A new family of linear structure Pt(II) (triphenylamine alkynyl) 2(triethyl-phosphine) (2-carboxy-2cyanovinyl-X-alkynyl) (where X ¼ thiophene (PT1), [2, 2 0 ]-bi-thiophene (PT2) or 1,2-di(2-thienyl) ethylene) (PT3)) complexes have been synthesized and characterized. The introduction of thiophene pbridges enhanced the extent of electron delocalization over the whole molecules, so their maximum absorption peaks were red shifted. These complexes have been tested as dye-sensitized solar cell (DSSC) sensitizers. PT2 showed the best photovoltaic performance, yielding 4.21% power conversion efficiency using a volatile electrolyte. As shown in an electrochemical impedance experiment, the different charge transfer resistance (R ct ) of the three sensitizers influences their injection lifetime of electrons and then their photoelectrical properties.Scheme 1 Molecular structure of the linear structured platinum acetylide complex (PTs).

(Dibenzoylmethanato)boron Difluoride Derivatives Containing Triphenylamine Moieties: A New Type of Electron‐Donor/π‐Acceptor System for Dye‐Sensitized Solar Cells

“…These devices were denoted as DSCs 1ad; their PCEs and other parameters are listed in Table 2. DSCs 1b and 1d exhibited PCEs of 3.9 and 4.2 %, respectively, which are greater than those of most organoboron sensitizers, although not as high as those of other organic dyes, organometallic dyes, [37] or ruthenium dyes such as N719 ( Table 2). The high PCEs of DSCs 1b and 1d are attributed to an increase in short-circuit photocurrent density (J sc ), which results from an increase in the incident photon-to-current conversion efficiency (IPCE).…”

Fabrication of dye sensitized solar cells with different anchoring mode based triphenylamine dyes

“…Dyes MIBA and BIBA exhibit high extinction coefficients (Table 1), for example, the value of ε for BIBA (ε = 4.5 × 10 4 M -1 cm -1 at 399 nm) is more than three times higher than that of the stan dard Z907 ruthenium sensitizer (ε = 1.2 × 10 4 M -1 cm -1 at 521 nm) [41]. The higher molar extinction coeffi cient value of BIBA dye enhances electrolyte diffusion in the film and reduces the recombination of the light induced charges during transportation [42], which might have increases the photocurrent, photo voltage and overall positive effect on the device performance. The fluorescence spectra recorded upon their excita tion of absorption maxima value of MIBA and BIBA exhibit luminescence maxima at 448 nm (λ ex = 405 nm) and 469 nm (λ ex = 411 nm) respectively.…”

Effect of structural optimization on the photovoltaic performance of dithieno[3,2-b:2′,3′-d]pyrrole-based dye-sensitized solar cells

“…The former is ascribed to a localized aromatic p-p* transition and the latter exhibits intramolecular charge-transfer (ICT) characteristics. 45 The absorption maxima (ICT) for DT, CD-T, TD-T, CD-C and TD-P in solution are 436 nm, 492 nm, 492 nm, 496 nm and 493 nm in the visible region, respectively, indicating that the donor unit at the 6-position of DTP ring can lead to a better absorption performance compared to the donor unit at the 4position (N-atom) of DTP ring. Except for DT, the spectra of CD-T, TD-T, CD-C and TD-P are quite similar, but the molar extinction coefficients (3) of TD-T (3 ¼ 44 555 M À1 cm À1 ) and TD-P (3 ¼ 49 945 M À1 cm À1 ) are smaller than those of CD-T (3 ¼ 56 370 M À1 cm À1 ) and CD-C (3 ¼ 62 471 M À1 cm À1 ), which indicates the superiority of the carbazole donor in its light harvesting capability.…”