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AgTFSI as p-Type Dopant for Efficient and Stable Solid-State Dye-Sensitized and Perovskite Solar Cells
KTH, School of Chemical Science and Engineering (CHE), Chemistry.
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.ORCID iD: 0000-0001-6005-2302
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.ORCID iD: 0000-0002-1763-9383
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry. KTH, School of Chemical Science and Engineering (CHE), Centres, Centre of Molecular Devices, CMD.
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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.

Place, publisher, year, edition, pages
2014. Vol. 7, no 12, 3252-3256 p.
Keyword [en]
doping, dyes/pigments, perovskites, silver, solar cells
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-158440DOI: 10.1002/cssc.201402678ISI: 000345976200006PubMedID: 25257308Scopus ID: 2-s2.0-84918784521OAI: oai:DiVA.org:kth-158440DiVA: diva2:777323
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
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.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:42
National Category
Organic Chemistry
Research subject
Chemistry
Identifiers
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)
Opponent
Supervisors
Note

QC 20150916

Available from: 2015-09-16 Created: 2015-09-16 Last updated: 2015-09-16Bibliographically approved
2. Strategies for Performance Improvement of Quantum Dot Sensitized Solar Cells
Open this publication in new window or tab >>Strategies for Performance Improvement of Quantum Dot Sensitized Solar Cells
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Quantum dot sensitized solar cells (QDSCs) constitute one of the most promising low-cost solutions that are explored for the world’s needs of clean and renewable energy. Efficient, low-toxic and stable QDSCs for large-scale applications have formed the subject for the solar cell research during recent years. This circumstance also forms the motivation for this thesis, where the results of my studies to improve the efficiency and stability of green QDSCs are presented and discussed.

The surface condition of quantum dots (QDs) is always crucial to the performance of QDSCs, since surface ligands can influence the loading amount of QDs, and that the surface defects can induce charge recombination in the solar cells. In this thesis work, a hybrid passivation approach was firstly utilized to improve the photovoltaic performance of CdSe QDs. After hybrid passivation by MPA and iodide ions, the loading efficiency of the QDs was increased with the ligands of MPA, and the surface defects on the QDs were reduced by the iodide ions, both contributing to an enhancement in the efficiency of the CdSe based QDSCs. This hybrid passivation strategy was then employed for low-toxic CuInS2 QDs, and was also demonstrated as an effective way to modify the surface state of the CuInS2 QDs and improve the performance of the QDSCs based on CuInS2 QDs.  

To improve the stability of the QDSCs, solid state quantum dot sensitized solar cells (ss-QDSCs) based on CuInS2 QDs were investigated. In addition to the hybrid passivation, increasing the pore size of the TiO2 active layer and changing the composition of the CuInS2 QDs were also found to be useful approaches to improve the performance of the ss-QDSCs based on CuInS2 QDs. Furthermore, for the most used hole transport material- Spiro-OMeTAD- in solid state solar cells, silver bis(trifluoromethanesulfonyl)imide was shown to be an effective p-type dopant to increase its conductivity and to improve the performance of the solar cells based on it.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 71 p.
Series
TRITA-BIO-Report, ISSN 1654-2312 ; 2016:11
Keyword
quantum dot sensitized solar cells
National Category
Chemical Engineering
Research subject
Theoretical Chemistry and Biology
Identifiers
urn:nbn:se:kth:diva-186363 (URN)978-91-7595-995-5 (ISBN)
Public defence
2016-06-07, FB 42, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Supervisors
Note

QC 20160516

Available from: 2016-05-16 Created: 2016-05-10 Last updated: 2016-05-16Bibliographically approved

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