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Advanced Organic Hole Transport Materials for Solution-Processed Photovoltaic Devices
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. (Licheng Sun)
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Solution-processable photovoltaic devices (PVs), such as perovskite solar cells (PSCs) and solid-state dye-sensitized solar cells (sDSCs) show great potential to replace the conventional silicon-based solar cells for achieving low-cost and large-area solar electrical energy generation in the near future, due to their easy manufacture and high efficiency. Organic hole transport materials (HTMs) play important roles in both PSCs and sDSCs, and thereby can well facilitate the hole separation and transportation, for obtaining high performance solar cells.

The studies in this thesis aimed to develop advanced small-molecule organic HTMs with low-cost, high hole mobility and conductivity for the achievement of highly efficient, stable and reproducible sDSCs and PSCs. In order to achieve these objectives, two different strategies were utilized in this thesis: the development of new generation HTMs with simple synthetic routes and the introduction of cost-effective p-type dopants to control the charge transport properties of HTMs.

In Chapter 1 and Chapter 2, a general introduction of the solution-processed sDSCs and PSCs, as well as the characterization methods that are used in this thesis were presented.

In Chapter 3 and Chapter 4, a series of novel triphenylamine- and carbazole- based HTMs with different oxidation potential, hole mobility, conductivity and molecular size were designed and synthesized, and then systematically applied and investigated in sDSCs and PSCs.

In Chapter 5, two low-cost and colorless p-type dopants AgTFSI and TeCA were introduced for the organic HTM-Spiro-OMeTAD, which can significantly increase the conductivity of the Spiro-OMeTAD films. The doping effects on the influence of sDSC and PSC device performances were also systematically investigated.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. , 76 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:42
National Category
Organic Chemistry
Research subject
Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-173651ISBN: 978-91-7595-660-2 (print)OAI: oai:DiVA.org:kth-173651DiVA: diva2:854267
Public defence
2015-10-09, F3, KTH, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20150916

Available from: 2015-09-16 Created: 2015-09-16 Last updated: 2015-09-16Bibliographically approved
List of papers
1. Efficient solid state dye-sensitized solar cells based on an oligomer hole transport material and an organic dye
Open this publication in new window or tab >>Efficient solid state dye-sensitized solar cells based on an oligomer hole transport material and an organic dye
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2013 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 1, no 46, 14467-14470 p.Article in journal (Refereed) Published
Abstract [en]

A low-cost and easily-synthesized organic hole transport material (HTM) X3 bearing triphenylamine units and an organic dye was utilized for solid state dye sensitized solar cells (ssDSCs), which have achieved the power conversion efficiencies of 5.8% and 7.1% under 1 sun and 0.46 sun, respectively, outperforming the ssDSC based on Spiro-OMeTAD 5.4% (1 sun) and 6.4% (0.46 sun).

Keyword
Spiro-Ometad, Molecular Materials, Semiconductors, Electrolyte, Performance, Conductors, Polymer, Devices
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-136534 (URN)10.1039/c3ta13646a (DOI)000326785700006 ()2-s2.0-84887222098 (Scopus ID)
Funder
Swedish Research CouncilSwedish Energy AgencyKnut and Alice Wallenberg Foundation
Note

QC 20131209

Available from: 2013-12-09 Created: 2013-12-05 Last updated: 2015-09-16Bibliographically approved
2. Integrated Design of Organic Hole Transport Materials for Efficient Solid-State Dye-Sensitized Solar Cells
Open this publication in new window or tab >>Integrated Design of Organic Hole Transport Materials for Efficient Solid-State Dye-Sensitized Solar Cells
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2015 (English)In: Advanced Energy Materials, ISSN 1614-6832, Vol. 5, no 3, 1401185Article in journal (Refereed) Published
Abstract [en]

A series of triphenylamine-based small molecule organic hole transport materials (HTMs) with low crystallinity and high hole mobility are systematically investigated in solid-state dye-sensitized solar cells (ssDSCs). By using the organic dye LEG4 as a photosensitizer, devices with X3 and X35 as the HTMs exhibit desirable power conversion efficiencies (PCEs) of 5.8% and 5.5%, respectively. These values are slightly higher than the PCE of 5.4% obtained by using the state-of-the-art HTM Spiro-OMeTAD. Meanwhile, transient photovoltage decay measurement is used to gain insight into the complex influences of the HTMs on the performance of devices. The results demonstrate that smaller HTMs induce faster electron recombination in the devices and suggest that the size of a HTM plays a crucial role in device performance, which is reported for the first time.

Keyword
hole mobility, hole transport materials, molecular size, oxidation potentials, solid-state dye-sensitized solar cells
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-163476 (URN)10.1002/aenm.201401185 (DOI)000350565400010 ()2-s2.0-84922354096 (Scopus ID)
Funder
Swedish Research CouncilSwedish Energy AgencyKnut and Alice Wallenberg Foundation
Note

QC 20150407

Available from: 2015-04-07 Created: 2015-04-07 Last updated: 2015-09-16Bibliographically approved
3. Carbazole-Based Hole-Transport Materials for Efficient Solid-State Dye-Sensitized Solar Cells and Perovskite Solar Cells
Open this publication in new window or tab >>Carbazole-Based Hole-Transport Materials for Efficient Solid-State Dye-Sensitized Solar Cells and Perovskite Solar Cells
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2014 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 26, no 38, 6629-6634 p.Article in journal (Refereed) Published
Abstract [en]

(Graph Presented) Two carbazole-based small molecule hole-transport materials (HTMs) are synthesized and investigated in solid-state dye-sensitized solar cells (ssDSCs) and perovskite solar cells (PSCs). The HTM X51-based devices exhibit high power conversion efficiencies (PCEs) of 6.0% and 9.8% in ssDSCs and PSCs, respectively. These results are superior or comparable to those of 5.5% and 10.2%, respectively, obtained for the analogous cells using the state-of-the-art HTM Spiro-OMeTAD.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2014
Keyword
hole-transport materials, solid-state dye-sensitized solar cells, perovskite solar cells, carbazole, hole mobility
National Category
Nano Technology Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-156445 (URN)10.1002/adma.201402415 (DOI)000343763200016 ()2-s2.0-84908031171 (Scopus ID)
Note

QC 20141202

Available from: 2014-12-02 Created: 2014-11-28 Last updated: 2017-12-05Bibliographically approved
4. AgTFSI as p-Type Dopant for Efficient and Stable Solid-State Dye-Sensitized and Perovskite Solar Cells
Open this publication in new window or tab >>AgTFSI as p-Type Dopant for Efficient and Stable Solid-State Dye-Sensitized and Perovskite Solar Cells
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2014 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 7, no 12, 3252-3256 p.Article in journal (Refereed) Published
Abstract [en]

A silver-based organic salt, silver bis(trifluoromethane-sulfonyl) imide (AgTFSI), was employed as an effective p-type dopant for the triarylamine-based organic hole-transport material Spiro-MeOTAD, which has been successfully applied in solid-state dye-sensitized solar cells (ssDSCs) and perovskite solar cells (PSCs). The power conversion efficiencies (PCEs) of AgTFSI-doped devices improved by 20%, as compared to the device based on the commonly used oxygen doping both for ssDSCs and PSCs. Moreover, the solid-state dye-sensitized devices exposed to AgTFSI as dopant showed considerably better stability than those of oxygen doped, qualifying this p-type dopant as a promising alterative for the preparation of highly efficient as well as stable ssDSCs and PSCs for the future.

Keyword
doping, dyes/pigments, perovskites, silver, solar cells
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-158440 (URN)10.1002/cssc.201402678 (DOI)000345976200006 ()25257308 (PubMedID)2-s2.0-84918784521 (Scopus ID)
Funder
Swedish Research CouncilSwedish Energy AgencyKnut and Alice Wallenberg Foundation
Note

QC 20150108

Available from: 2015-01-08 Created: 2015-01-08 Last updated: 2017-12-05Bibliographically approved
5. 1,1,2,2-Tetrachloroethane (TeCA) as a Solvent Additive for Organic Hole Transport Materials and Its Application in Highly Efficient Solid-State Dye-Sensitized Solar Cells
Open this publication in new window or tab >>1,1,2,2-Tetrachloroethane (TeCA) as a Solvent Additive for Organic Hole Transport Materials and Its Application in Highly Efficient Solid-State Dye-Sensitized Solar Cells
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2015 (English)In: Advanced Energy Materials, ISSN 1614-6832, Vol. 5, no 10, 1402340Article in journal (Refereed) Published
Abstract [en]

A low-cost, chlorinated hydrocarbon solvent, 1,1,2,2-tetrachloroethane (TeCA), is used as an effective additive for the triarylamine-based organic hole-transport material, Spiro-OMeTAD, which is successfully applied in highly efficient solid-state dye-sensitized solar cells. A record power conversion efficiency of 7.7% is obtained by using the donor (D)-π-acceptor (A)-dye, LEG4, in combination with the new method of TeCA-doping of the hole-transporting material Spiro-OMeTAD.

Keyword
conductivity, hole-transport materials, p-type dopants, solid-state dye-sensitized solar cells
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-169262 (URN)10.1002/aenm.201402340 (DOI)000354810400011 ()2-s2.0-84929963802 (Scopus ID)
Funder
Swedish Research CouncilSwedish Energy AgencyKnut and Alice Wallenberg Foundation
Note

QC 20150616

Available from: 2015-06-16 Created: 2015-06-12 Last updated: 2016-12-06Bibliographically approved

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