Donor-π–Acceptor Based Stable Porphyrin Sensitizers for Dye-Sensitized Solar Cells: Effect of π-Conjugated Spacers

Abstract

Porphyrins are major sensitizers in dye-sensitized solar cells (DSSC) results in very high power conversion efficiency, however, aggregation tendency and visible range absorption avoids realistic applications. Thus, designing of novel porphyrins based sensitizers are essential to resolve the current existing issues. In this context, seven D-π-A porphyrin dyes (LG1-LG7) engineered with 3ethynyl phenothiazine tethered at the meso-position and π-spacers such as 4-ethynyl phenyl (LG1), 5-efficiency in liquid electrolyte, which is very useful to make the efficient future generated dye sensitized solar cells.

Near‐Infrared‐Absorbing Metal‐Free Organic, Porphyrin, and Phthalocyanine Sensitizers for Panchromatic Dye‐Sensitized Solar Cells

“…Additionally, XW21 demonstrated a red‐shifted IPCE spectrum, when co‐adsorbed with CDCA, which increased the peak IPCE from 63 % (with no CDCA) to 90 % and the PCE from 7.5 % to 9.6 %. In LG5, a CAA acceptor substituted on a thiophene π‐bridge was employed to red‐shift absorbances . When compared to an analogous dye using the more common BTD–benzoic acid acceptor, LG6 (see Ref.…”

“…When compared to an analogous dye using the more common BTD–benzoic acid acceptor, LG6 (see Ref. for structure), LG5 has a narrower allowing the use of lower‐energy photons and the ability to generate higher J SC values. LG5‐based devices demonstrated excellent IPCE values across the spectrum, which translated to a remarkable J SC of 21 mA cm −2 to yield PCEs up to 10.2 %.…”

Role of Co‐Sensitizers in Dye‐Sensitized Solar Cells

“…Varying concentrations of TBP added to a series of heteroleptic Ru II cyclometalated complexes (referred to as TC‐1 – TC‐3 , Figure ) was also studied and resulted in PCE values up to 7.63 % . Since then, Giribabu and co‐workers studied the effect of additives on the PCE of porphyrin‐based DSSCs (referred to as LG1 – LG7 , Figure ) with 0.1–0.5 m concentrations of TBP, and obtained PCE values of up to 10.2 % . They concluded that additives played a major role in increasing V OC by shifting E C of the TiO 2 .…”

First Principles Study of Dendritic Carbazole Photosensitizer Dyes Modified with Different Conjugation Structures

“…The modifications in length or structures of the conjugation pathway have significant effects on the electronic functioning of dyes to provide red shift in electronic transitions . It has been studied that tuning the properties of conjugation chain molecule by varying its length results in improved adjustment of their frontier orbital energy levels ,…”

“…Cyanoacrilic acid is mostly utilized moity to inject electron from donor to photoanode in which cyano group acts as acceptor and carboxyl group as anchoring unit. The cyanoacrylic acid group is considered as one of the most efficient group due to its exceptional electron withdrawing properties ,,. Thiophene segment has been studied as a potential conjugating group for better solar energy harvesting efficiency ,.…”