New Type of Organic Sensitizers with a Planar Amine Unit for Efficient Dye-Sensitized Solar Cells

Abstract

A new type of organic sensitizers incorporating a planar amine unit have been synthesized and demonstrated to be a highly efficient sensitizers, showing evidence of lateral interactions on the TiO(2) surface. Under standard global air mass 1.5 solar conditions, the JK-98 sensitized cell gave a short circuit photocurrent density (J(sc)) of 16.78 mA cm(-2), an open-circuit voltage (V(oc)) of 0.745 V, and a fill factor (ff) of 0.70, corresponding to an overall conversion efficiency (η) of 8.71%.

Planar amine-based dye features the rigidified O-bridged dithiophene π-spacer: A potential high-efficiency sensitizer for dye-sensitized solar cells application

“…2, the simulated spectra consist of a very intense and well isolated transition in the region of 400e700 nm. In particular, for P2T, the calculated maximum absorption (l max ) is located at 482 nm which is in good agreement with the corresponding experimental result [22]. For PC2T, the incorporation of C atom results in slightly red-shifted and broadened absorption spectrum, as compared to P2T.…”

“…Recently, a highly efficient organic dye containing dithiophene p-spacer with planar amine-based donor group (denoted as P2T, as shown in Fig. 1) was designed and reported by Do et al, which achieves a promising conversion efficiency of 8.71% [22]. Herein, motivated by the prior work of Wang et al and Do et al [21,22], we consider using fastening atoms (C, N, and O) to rigidify dithiophene via covalent immobilization of the adjacent two thiophene units.…”

“…1) was designed and reported by Do et al, which achieves a promising conversion efficiency of 8.71% [22]. Herein, motivated by the prior work of Wang et al and Do et al [21,22], we consider using fastening atoms (C, N, and O) to rigidify dithiophene via covalent immobilization of the adjacent two thiophene units. We expect the rotational disorder of molecules can be efficiently suppressed through this way.…”

Organic Sensitizers Featuring a Planar Indeno[1,2‐b]‐thiophene for Efficient Dye‐Sensitized Solar Cells

“…DSSCs with polypyridyl ruthenium sensitizers have shown the highest efficiencies (> 11 %). [7][8][9] Several strategies have been considered for addressing both these issues such as the use of b-cyclodextrin-encapsulated molecules, [10] the structural modification of the sensitizers, [11] and the use of additives. Nevertheless, many organic sensitizers have still presented a low conversion efficiency and low stability.…”

Organic Sensitizers with Bridged Triphenylamine Donor Units for Efficient Dye‐Sensitized Solar Cells

“…[ 26 ] To prevent dye aggregation on TiO 2 surface, t -butyl and dimethyl groups are introduced to modify the bridged triphenylamine core. This approach also increases the solubility of the dyes.…”