Performance evaluation of dye-sensitized solar cells (DSSCs) based on metal-free thieno[3,2-b]indole dyes
A series of thieno[3,2- b ]indole-based dyes ( IS 1–10 ) was readily synthesized in three steps from 2-(thien-2-yl)thieno[3,2- b ]indole as the key precursor, and further applied as photosensitizers for dye-sensitized solar cells (DSSCs). In general, the prepared dyes have a push–pull (donor-π-linke...
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Veröffentlicht in: | Journal of materials science. Materials in electronics 2022-03, Vol.33 (9), p.6307-6317 |
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Sprache: | eng |
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Zusammenfassung: | A series of thieno[3,2-
b
]indole-based dyes (
IS 1–10
) was readily synthesized in three steps from 2-(thien-2-yl)thieno[3,2-
b
]indole as the key precursor, and further applied as photosensitizers for dye-sensitized solar cells (DSSCs). In general, the prepared dyes have a push–pull (donor-π-linker-acceptor) structure, included thieno[3,2-
b
]indole ring system, bearing different aliphatic substituents at the nitrogen atom, as an electron-donating part, single thiophene unit as π-linker, and 2-cyanoacrylic acid (
IS 1–5
), or 5-(methylene)barbituric acid (
IS 6–10
) as an acceptor-anchoring group. The DSSC devices based on
IS 1–10
dyes were fabricated using commercially available TiO
2
-coated photoanodes, and their photovoltaic characteristics were investigated. The DSSCs based on
IS 1–5
dyes exhibited values of power conversion efficiency (PCE) in the range of 2.25–3.02%, while the DSSCs based on
IS 6–10
dyes showed significantly low values of PCE in the range of 0.20–0.32% under AM 1.5G illumination (100 mW cm
−2
). The highest PCE value of 3.02% (
J
sc
= 7.59 mA cm
−2
,
V
oc
= 0.62 V, FF = 0.64) was achieved for DSSC based on dye
IS 4
, bearing 2-cyanoacrylic acid as an acceptor-anchoring group among all dyes
IS 1–10
, whereas
IS 9
, bearing 5-(methylene)barbituric acid displays best PCE of 0.32% (
J
sc
= 0.87 mA cm
−2
,
V
oc
= 0.53 V and FF = 0.68) among dyes
IS 6–10
. Therefore, additional studies, including thermogravimetric analysis, UV–Vis, and FTIR-measurements on the TiO
2
surface, cyclic voltammograms, and photoelectrochemical measurements, were carried out for these two dyes. |
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ISSN: | 0957-4522 1573-482X |
DOI: | 10.1007/s10854-022-07805-w |