A double-acceptor as a superior organic dye design for p-type DSSCs: high photocurrents and the observed light soaking effect

Abstract

Herein, we report three novel single donor double acceptor dyes, BH2, 4, and 6, for use in p-type dye sensitized solar cells (DSSCs). BH4 yields one of the highest photocurrents, 7.4 mA cm(-2), to date. The high performance is achieved via a shorter synthetic route and no exotic materials or cell-building techniques. We suggest a structural principle when building dyes whereby one adopts a double acceptor/single anchor when a triphenylamine moiety is incorporated into a dye for p-type DSSCs. This strategy increases the molar extinction coefficient while simultaneously reducing the number of synthetic steps. The molar extinction coefficients (99 980 M(-1) cm(-1)) reported herein are among the highest reported. Finally, we report the first-ever-observed light soaking effect in p-type DSSCs.

Isoindigo derivatives for application in p-type dye sensitized solar cells

“…To quantify the dye loading on the monocrystalline lms of DSSCs, desorption experiments are generally carried out using a base (usually NaOH or Bu 4 NOH in DMF). 26 These values are in the range of those reported with dyes anchored with the same N,N-di(4benzoic acid)phenylamine (around 1 Â 10 À8 mol cm À2 ) 27 but lower than that of the famous P1 dye anchored with a single carboxylic acid group (12.3 Â 10 À8 mol cm À2 ) 28 and the highly performing push-pull thienoquinoidal dye recently reported (8.5 Â 10 À8 mol cm À2 ). Accordingly, we have developed another strategy based on the competitive adsorption of an adsorbent which has a stronger affinity to NiO surface than the carboxylic acids.…”

An Indacenodithieno[3,2‐b]thiophene‐Based Organic Dye for Solid‐State p‐Type Dye‐Sensitized Solar Cells

“…[28] Subsequently,w ed eveloped as olution-processable method to thermally prepareZ nO insteado fT iO 2 as the ETM in the pores of the NiO mesoporouse lectrode, whichg ave as ignificant improvement in the photovoltaic performance, [29] increasing the photocurrent to 680 mAcm À2 .I ti st herefore feasible to further improvet he performance of p-ssDSCs by optimizing the ETM, as well as its fabrication methods. [31] The IDTT linker was synthesized according to ar eported method. [30] In this study,t om ake ad ye with broad spectral response, [12] we have designed and synthesized an indacenodithieno[3,2-b]thiophene (IDTT)-based dye (TIP;F igure 1), which has been successfully used in p-ssDSCs and also shown much better efficiency,a sc ompared to the two reported reference dyes, PB6 [27] and BH4.…”

Bay Annulated Indigo as a New Chromophore for p‐type Dye‐Sensitized Solar Cells

“…This is supported by the higher dark currents for BAI‐COOH than P1 (Figure b). While the aliphatic chains present on BAI‐COOH should inhibit electrolyte/NiO recombination,, lower dye loading (see below) could counter this effect. Despite performing worse than P1 , the cell results for BAI‐COOH are higher than the structurally related ‘first‐generation’ DPP dyes ( DPP‐Br/Th‐DPP) ,, which shows that BAI is a promising chromophore on which to base a more structurally complex dye.…”