Issue 18, 2018, Issue in Progress

Numbers of cyanovinyl substitutes and their effect on phenothiazine based organic dyes for dye-sensitized solar cells

Abstract

A series of phenothiazine based dyes (OMS1–3), comprising different conjugation lengths and numbers of electron deficient (cyanovinyl) moieties with cyanoacrylic acid as an anchor, have been synthesized. The dyes display broad UV-visible absorption, from 389 nm to 484 nm. The higher molar extinction coefficient and longer absorption peak are achieved as the conjugation length and numbers of electron deficient units increase. The cell performance based on these dyes exhibits efficiencies ranging from 0.68–4.00%, compared to a standard N719-based device (PCE = 7.49%) fabricated under similar conditions. Although the OMS3 dye has two electron deficient units between phenothiazine units, an insignificant electron trapping effect is observed. From the results, the OMS3 based cell exhibits the highest short circuit current (JSC) at 8.72 mA cm−2 and the highest open-circuit voltage (VOC) at 0.66 V, together with the best cell performance at 4.00%.

Graphical abstract: Numbers of cyanovinyl substitutes and their effect on phenothiazine based organic dyes for dye-sensitized solar cells

Article information

Article type
Paper
Submitted
02 Jan 2018
Accepted
27 Feb 2018
First published
09 Mar 2018
This article is Open Access
Creative Commons BY license

RSC Adv., 2018,8, 9783-9789

Numbers of cyanovinyl substitutes and their effect on phenothiazine based organic dyes for dye-sensitized solar cells

Y. Chen, Y. Kuo and C. Liang, RSC Adv., 2018, 8, 9783 DOI: 10.1039/C7RA13751F

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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