Dye-sensitized solar cells: Investigation of D-A-π-A organic sensitizers based on [1,2,5]selenadiazolo[3,4-c]pyridine

Ekaterina A. Knyazeva; Wenjun Wu; Timofey N. Chmovzh; Neil Robertson; J. Derek Woollins; Oleg A. Rakitin

doi:10.1016/j.solener.2017.01.016

Dye-sensitized solar cells: Investigation of D-A-π-A organic sensitizers based on [1,2,5]selenadiazolo[3,4-c]pyridine

Ekaterina A. Knyazeva
, Wenjun Wu
, Timofey N. Chmovzh
, Neil Robertson
, J. Derek Woollins
, Oleg A. Rakitin

School of Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

We report two series of D-A-π-A metal-free organic sensitizers for dye-sensitized solar cells (DSSCs) based on triphenylamine and N-hexyl-carbazole as electronic donors, respectively. Through varying auxiliary acceptors and π-spacers, several significant consequences on cell efficiency were identified: (i) a broadened UV–Vis absorption spectrum and low-lying LUMO level with [1,2,5]selenadiazolo[3,4-c] pyridine as auxiliary acceptor; (ii) compensation for the absorption valley around 400 nm in the UV–vis spectra by the introduction of a thiophene unit into the π-bridge; (iii) effective improvement of the power conversion efficiency (PCE) by means of cosensitization, leading to dye OKT-1, 3.10% PCE, increased to 4.19% with squaraine dye SQ2 as co-sensitizer. The design criteria identified have opened the door for further optimization of this new dye family.

Original language	English
Pages (from-to)	134-143
Journal	Solar Energy
Volume	144
Early online date	17 Jan 2017
DOIs	https://doi.org/10.1016/j.solener.2017.01.016
Publication status	E-pub ahead of print - 17 Jan 2017

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10.1016/j.solener.2017.01.016

20170108 Robertson Final revised Manuscript without marksAccepted author manuscript, 378 KBLicence: Creative Commons: Attribution-NonCommercial-NoDerivatives (CC BY-NC-ND)

http://linkinghub.elsevier.com/retrieve/pii/S0038092X17300257

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@article{ffea8558675d4a4e87139ba855fafc0d,

title = "Dye-sensitized solar cells: Investigation of D-A-π-A organic sensitizers based on [1,2,5]selenadiazolo[3,4-c]pyridine",

abstract = "We report two series of D-A-π-A metal-free organic sensitizers for dye-sensitized solar cells (DSSCs) based on triphenylamine and N-hexyl-carbazole as electronic donors, respectively. Through varying auxiliary acceptors and π-spacers, several significant consequences on cell efficiency were identified: (i) a broadened UV–Vis absorption spectrum and low-lying LUMO level with [1,2,5]selenadiazolo[3,4-c] pyridine as auxiliary acceptor; (ii) compensation for the absorption valley around 400 nm in the UV–vis spectra by the introduction of a thiophene unit into the π-bridge; (iii) effective improvement of the power conversion efficiency (PCE) by means of cosensitization, leading to dye OKT-1, 3.10\% PCE, increased to 4.19\% with squaraine dye SQ2 as co-sensitizer. The design criteria identified have opened the door for further optimization of this new dye family.",

author = "Knyazeva, \{Ekaterina A.\} and Wenjun Wu and Chmovzh, \{Timofey N.\} and Neil Robertson and Woollins, \{J. Derek\} and Rakitin, \{Oleg A.\}",

year = "2017",

month = jan,

day = "17",

doi = "10.1016/j.solener.2017.01.016",

language = "English",

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journal = "Solar Energy",

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T1 - Dye-sensitized solar cells: Investigation of D-A-π-A organic sensitizers based on [1,2,5]selenadiazolo[3,4-c]pyridine

AU - Knyazeva, Ekaterina A.

AU - Wu, Wenjun

AU - Chmovzh, Timofey N.

AU - Robertson, Neil

AU - Woollins, J. Derek

AU - Rakitin, Oleg A.

PY - 2017/1/17

Y1 - 2017/1/17

N2 - We report two series of D-A-π-A metal-free organic sensitizers for dye-sensitized solar cells (DSSCs) based on triphenylamine and N-hexyl-carbazole as electronic donors, respectively. Through varying auxiliary acceptors and π-spacers, several significant consequences on cell efficiency were identified: (i) a broadened UV–Vis absorption spectrum and low-lying LUMO level with [1,2,5]selenadiazolo[3,4-c] pyridine as auxiliary acceptor; (ii) compensation for the absorption valley around 400 nm in the UV–vis spectra by the introduction of a thiophene unit into the π-bridge; (iii) effective improvement of the power conversion efficiency (PCE) by means of cosensitization, leading to dye OKT-1, 3.10% PCE, increased to 4.19% with squaraine dye SQ2 as co-sensitizer. The design criteria identified have opened the door for further optimization of this new dye family.

AB - We report two series of D-A-π-A metal-free organic sensitizers for dye-sensitized solar cells (DSSCs) based on triphenylamine and N-hexyl-carbazole as electronic donors, respectively. Through varying auxiliary acceptors and π-spacers, several significant consequences on cell efficiency were identified: (i) a broadened UV–Vis absorption spectrum and low-lying LUMO level with [1,2,5]selenadiazolo[3,4-c] pyridine as auxiliary acceptor; (ii) compensation for the absorption valley around 400 nm in the UV–vis spectra by the introduction of a thiophene unit into the π-bridge; (iii) effective improvement of the power conversion efficiency (PCE) by means of cosensitization, leading to dye OKT-1, 3.10% PCE, increased to 4.19% with squaraine dye SQ2 as co-sensitizer. The design criteria identified have opened the door for further optimization of this new dye family.

U2 - 10.1016/j.solener.2017.01.016

DO - 10.1016/j.solener.2017.01.016

M3 - Article

SN - 0038-092X

VL - 144

SP - 134

EP - 143

JO - Solar Energy

JF - Solar Energy

ER -

Dye-sensitized solar cells: Investigation of D-A-π-A organic sensitizers based on [1,2,5]selenadiazolo[3,4-c]pyridine

Abstract

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