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Integrated Design of Organic Hole Transport Materials for Efficient Solid-State Dye-Sensitized Solar Cells
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. KTH, School of Chemical Science and Engineering (CHE), Centres, Centre of Molecular Devices, CMD.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. KTH, School of Chemical Science and Engineering (CHE), Centres, Centre of Molecular Devices, CMD. Uppsala University, Sweden.
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology. Shandong Normal University, China.
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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.

Place, publisher, year, edition, pages
2015. Vol. 5, no 3, 1401185
Keyword [en]
hole mobility, hole transport materials, molecular size, oxidation potentials, solid-state dye-sensitized solar cells
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-163476DOI: 10.1002/aenm.201401185ISI: 000350565400010ScopusID: 2-s2.0-84922354096OAI: diva2:800722
Swedish Research CouncilSwedish Energy AgencyKnut and Alice Wallenberg Foundation

QC 20150407

Available from: 2015-04-07 Created: 2015-04-07 Last updated: 2015-09-16Bibliographically approved
In thesis
1. Advanced Organic Hole Transport Materials for Solution-Processed Photovoltaic Devices
Open this publication in new window or tab >>Advanced Organic Hole Transport Materials for Solution-Processed Photovoltaic Devices
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.
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:42
National Category
Organic Chemistry
Research subject
urn:nbn:se:kth:diva-173651 (URN)978-91-7595-660-2 (ISBN)
Public defence
2015-10-09, F3, KTH, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)

QC 20150916

Available from: 2015-09-16 Created: 2015-09-16 Last updated: 2015-09-16Bibliographically approved

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Xu, BoTian, HainingLin, LiliLuo, YiSun, Licheng
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Organic ChemistryCentre of Molecular Devices, CMDTheoretical Chemistry and BiologyZhejiang-KTH Joint Research Center of Photonics, JORCEP
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