Change search
Link to record
Permanent link

Direct link
BETA
Publications (3 of 3) Show all publications
Yang, L., Lindblad, R., Gabrielsson, E., Boschloo, G., Rensmo, H., Sun, L., . . . Johansson, E. M. (2018). Experimental and Theoretical Investigation of the Function of 4- tert -Butyl Pyridine for Interface Energy Level Adjustment in Efficient Solid-State Dye-Sensitized Solar Cells. ACS Applied Materials and Interfaces, 10(14), 11572-11579
Open this publication in new window or tab >>Experimental and Theoretical Investigation of the Function of 4- tert -Butyl Pyridine for Interface Energy Level Adjustment in Efficient Solid-State Dye-Sensitized Solar Cells
Show others...
2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 14, p. 11572-11579Article in journal (Refereed) Published
Abstract [en]

4-tert-Butylpyridine (t-BP) is commonly used in solid state dye-sensitized solar cells (ssDSSCs) to increase the photovoltaic performance. In this report, the mechanism how t-BP functions as a favorable additive is investigated comprehensively. ssDSSCs were prepared with different concentrations of t-BP, and a clear increase in efficiency was observed up to a maximum concentration and for higher concentrations the efficiency thereafter decreases. The energy level alignment in the complete devices was measured using hard X-ray photoelectron spectroscopy (HAXPES). The results show that the energy levels of titanium dioxide are shifted further away from the energy levels of spiro-OMeTAD as the t-BP concentration is increased. This explains the higher photovoltage obtained in the devices with higher t-BP concentration. In addition, the electron lifetime was measured for the devices and the electron lifetime was increased when adding t-BP, which can be explained by the recombination blocking effect at the surface of TiO2. The results from the HAXPES measurements agree with those obtained from density functional theory calculations and give an understanding of the mechanism for the improvement, which is an important step for the future development of solar cells including t-BP.

Place, publisher, year, edition, pages
American Chemical Society, 2018
Keywords
dye, mesoporous, photovoltaic, solar energy, TiO2
National Category
Other Chemistry Topics
Identifiers
urn:nbn:se:kth:diva-227617 (URN)10.1021/acsami.7b16877 (DOI)000430156000021 ()29560716 (PubMedID)2-s2.0-85045306990 (Scopus ID)
Funder
Swedish Energy AgencySwedish Research CouncilSwedish Research Council FormasEU, FP7, Seventh Framework Programme, 226716
Note

QC 20180518

Available from: 2018-05-18 Created: 2018-05-18 Last updated: 2018-05-18Bibliographically approved
Gabrielsson, E., Tian, H., Eriksson, S. K., Gao, J., Chen, H., Li, F., . . . Sun, L. (2015). Dipicolinic acid: a strong anchoring group with tunable redox and spectral behavior for stable dye-sensitized solar cells. Chemical Communications, 51(18), 3858-3861
Open this publication in new window or tab >>Dipicolinic acid: a strong anchoring group with tunable redox and spectral behavior for stable dye-sensitized solar cells
Show others...
2015 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 51, no 18, p. 3858-3861Article in journal (Refereed) Published
Abstract [en]

Dipicolinic acidwas investigated as a new anchoring group for DSSCs. A pilot dye (PD2) bearing this new anchoring group was found to adsorb significantly stronger to TiO2 than its cyanoacrylic acid analogue. The electrolyte composition was found to have a strong effect on the photoelectrochemical properties of the adsorbed dye in the device, allowing the dye LUMO energy to be tuned by 0.5 eV. Using a pyridine-free electrolyte, panchromatic absorption of the dye on TiO2 extending to 900 nm has been achieved. Solar cells using PD2 and a Co(bpy)(3) based electrolyte showed unique stability under simulated sunlight and elevated temperatures.

Keywords
Core-Level Shift, Electrolytes, Additives, Molecules
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-163486 (URN)10.1039/c4cc06432a (DOI)000349990600035 ()25655483 (PubMedID)2-s2.0-84923136577 (Scopus ID)
Funder
Knut and Alice Wallenberg FoundationSwedish Energy AgencyVINNOVASwedish Research Council
Note

QC 20150407

Available from: 2015-04-07 Created: 2015-04-07 Last updated: 2017-12-04Bibliographically approved
Gabrielsson, E. (2014). Molecular Engineering of D-π-A Dyes for Dye-Sensitized Solar Cells. (Doctoral dissertation). Stockholm: KTH Royal Institute of Technology
Open this publication in new window or tab >>Molecular Engineering of D-π-A Dyes for Dye-Sensitized Solar Cells
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Dye-sensitized solar cells (DSSCs) present an interesting method for the conversion of sunlight into electricity. Unlike in other photovoltaic technologies, the difficult tasks of light absorption and charge transport are handled by two different materials in DSSCs. At the heart of the DSSC, molecular light absorbers (dyes) are responsible for converting light into current.

In this thesis the design, synthesis and properties of new metal-free D-π-A dyes for dye-sensitized solar cells will be explored. The thesis is divided into six parts:

Part one offers a general introduction to DSSCs, dye design and device characterization.

Part two is an investigation of a series of donor substituted dyes where structural benefits are compared against electronic benefits.

In part three a dye assembly consisting of a chromophore tethered to two electronically decoupled donors is described. The assembly, capable of intramolecular regeneration, is found to impede recombination.

Part four explores a method for rapidly synthesizing new D-π-A dyes by dividing them into donor, linker and acceptor fragments that can be assembled in two simple steps. The method is applied to synthesize a series of linker varied dyes for cobalt based redox mediators that builds upon the experience from part two.

Part five describes the synthesis of a bromoacrylic acid based dye and explores the photoisomerization of a few bromo- and cyanoacrylic acid based dyes.

Finally, in part six the experiences from previous chapters are combined in the design and synthesis of a D-π-A dye bearing a new pyridinedicarboxylic acid acceptor and anchoring group.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. p. 66
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 20
Keywords
Dye-sensitized solar cells, Molecular electronics, Molecular engineering, Organic synthesis, Photovoltaics
National Category
Organic Chemistry
Research subject
Chemistry
Identifiers
urn:nbn:se:kth:diva-144874 (URN)978-91-7595-124-9 (ISBN)
Public defence
2014-05-23, F3, Lindstedtsvägen 26, KTH, Stockholm, 14:00 (English)
Opponent
Supervisors
Funder
Swedish Energy AgencySwedish Research CouncilKnut and Alice Wallenberg FoundationEU, FP7, Seventh Framework Programme, 246124StandUp
Note

QC 20140509

Available from: 2014-05-09 Created: 2014-04-30 Last updated: 2019-12-20Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6029-1688

Search in DiVA

Show all publications