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Novel organic sensitizers and hole transport materials for efficient solid-state photovoltaic devices
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry. KTH.
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

State-of-art solid-state photovoltaic devices, such as solid-state dye sensitized solar cells (ssDSSCs) and perovskite solar cells have attracted significant attention due to their high efficiency and potential low-cost manufacture. However, there are still challenges that limit the application up-scaling..

 

One important factor that limits the efficiency of ssDSSCs is associated with the sensitizers. In this thesis, we have developed several organic sensitizers for highly efficient and stable ssDSSCs. The compatibility between sensitizers and hole transport materials has also been investigated. Novel blue colored sensitizers have been studied with aesthetic applications in mind. By co-sensitization using two complementary sensitizing dyes, the efficiency of ssDSSCs can be increased significantly..

 

For both PSCs and ssDSSCs, the hole transport materials (HTMs) represent one of the crucial factors for efficient charge collection as well as future cost of manufacturing. Here, we have studied organic triphenylamine based oligomers as HTMs for both ssDSSCs and PSCs. The influence of the molecular structure of the HTM building blocks on the photovoltaic performance has been studied in detail. In order to minimizing the cost of fabrication of photovoltaic devices, we have also developed sulfur-based cross-linked polymers as HTMs to replace the well-known, expensive HTM Spiro-OMeTAD. The cross-linked polymeric sulfur material work well in both ssDSSCs and PSCs with efficiencies around 2% and 10%, respectively. These results will provides important insights for the future design of inexpensive and efficient solid state photovoltaic devices.

Abstract [sv]

Nya solceller på forskningsstadiet, såsom fasta färgämnessensiterade solceller (ssDSSC) och perovskitsolceller (PSC), har tilldragit sig stor uppmärksamhet pga hög effektivitet och potentiellt låg tillverkningskostnad. Dessa typer av solceller konfronteras dock med utmaningar vilka förhindrar uppskalning.

 

En viktig begränsande faktor för omvandlingseffektiviteten från ssDDSC kan hänföras till de sensiterande färgämnena. I den här avhandlingen har vi utvecklat flera nya organiska färgämnen för effektiva och stabila ssDSSC. Kompatibiliteten mellan dessa färgämnen och hål-ledande material har också undersökts. Nya blå färgämnen har studerats med särskild avsikt att skapa förutsättningar för estetiskt tilltalande solceller. Genom samtidig sensitering med två olika och kompletterande färgämnen har solceller med högra effektivitet kunnat tillverkas.

 

Hål-transportmaterial (HTM) till både ssDSSC och PSC utgör en viktig parameter för effektiv omvandling liksom en framtida tillverkningskostnad. In detta arbete har vi undersökt organiska, trifenylaminbaserade HTM till både ssDSSC och PSC. Effekter från den molekylära strukturen i de hål-ledande materialens byggstenar  har studerats i detalj. Med sikte på en framtida låg tillverkningskostnad av solceller av dessa typer, så har också korslänkade svavelbaserade HTM tagits fram för att ersätta det välkända och dyra materialet Spiro-OMeTAD. Dessa korslänkade och polymera svavelmaterial ger ssDSSC och PSC med höga omvandlingseffektiviteter, 2% respektive 10%. Resultaten i denna avhandling ger viktiga insikter för utveckling av framtida billiga och samtidigt effektiva fasta solceller.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. , 71 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2017:4
Keyword [en]
organic sensitizers, ssDSCs, perovskite solar cell, hole transport materials, cross-linked polymeric sulfur
National Category
Physical Chemistry
Research subject
Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-211089ISBN: 978-91-7729-454-2 (print)OAI: oai:DiVA.org:kth-211089DiVA: diva2:1127417
Public defence
2017-09-12, F3, Lindstedtsvägen 26, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20170714

Available from: 2017-07-14 Created: 2017-07-14 Last updated: 2017-07-14Bibliographically approved
List of papers
1. The combination of a new organic D-pi-A dye with different organic hole-transport materials for efficient solid-state dye-sensitized solar cells
Open this publication in new window or tab >>The combination of a new organic D-pi-A dye with different organic hole-transport materials for efficient solid-state dye-sensitized solar cells
Show others...
2015 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 3, no 8, 4420-4427 p.Article in journal (Refereed) Published
Abstract [en]

A new organic donor-pi-acceptor sensitizer MKA253 has been applied for highly efficient solid-state dye-sensitized solar cells (ssDSSCs). Using 2,2',7,7'-tetrakis(N,N-di-pi-methoxyphenyl-amine) 9,9'-spirobifluorene (Spiro-OMeTAD) as the hole transport material (HTM), an excellent power conversion efficiency of 6.1% was recorded together with a high short-circuit current of 12.4 mA cm(-2) under standard AM 1.5G illumination (100 mW cm(-2)). Different combinations of dyes and HTMs have also been investigated in the ssDSSC device. The results showed that small molecule HTM based devices suffer from comparably high electron recombination losses, thus causing low open-circuit voltage. In addition, photo-induced absorption (PIA) spectroscopy showed that the small-molecule HTMs lead to more efficient dye regeneration in comparison with Spiro-OMeTAD, despite a lower thermodynamic driving force. The results of this study also show that optimized energy levels for the dye-HTMs could be a vital factor for highly efficient ssDSSCs.

Place, publisher, year, edition, pages
RSC Publishing, 2015
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-161984 (URN)10.1039/c4ta05774k (DOI)000349667700038 ()2-s2.0-84922843906 (Scopus ID)
Note

QC 20150407

Available from: 2015-04-07 Created: 2015-03-20 Last updated: 2017-07-14Bibliographically approved
2. Molecular Engineering of D-π-A Type of Blue Dyes for Highly Efficient Solid State Dye Sensitized Solar Cells by Co-Sensitization
Open this publication in new window or tab >>Molecular Engineering of D-π-A Type of Blue Dyes for Highly Efficient Solid State Dye Sensitized Solar Cells by Co-Sensitization
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2017 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501Article in journal (Refereed) Submitted
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-211085 (URN)
Note

QC 20170714

Available from: 2017-07-14 Created: 2017-07-14 Last updated: 2017-07-14Bibliographically approved
3. Novel and Stable D-A-π-A Dyes for Efficient Solid-state Dye-sensitized Solar Cells
Open this publication in new window or tab >>Novel and Stable D-A-π-A Dyes for Efficient Solid-state Dye-sensitized Solar Cells
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2017 (English)In: ACS Omega, Vol. 2, no 5, 1812-1819 p.Article in journal (Refereed) Published
Abstract [en]

Two novel organic donor–acceptor−π–acceptor sensitizers, W7 and W8, have been applied in efficient solid-state dye-sensitized solar cells (ssDSSCs). Using 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine) 9,9′-spirobifluorene (Spiro-OMeTAD) as hole-transport material (HTM), an excellent power conversion efficiency of 6.9% was recorded for W7, together with an excellent photocurrent of 10.51 mA cm–2 and a high open-circuit voltage of 880 mV under standard AM 1.5 G illumination (100 mW cm–2). The solid-state solar cells based on W8 showed an efficiency of 5.2%, with a good photocurrent of 9.55 mA cm–2 and an open-circuit voltage of 870 mV. Compared to that of the well-known WS2 sensitizer, the results show that the performance of the ssDSSC devices can be significantly improved by introducing triphenylamine moiety into their structure. In addition, results of photoinduced absorption spectroscopy show efficient dye regeneration for W7- and W8-based devices. A higher hole conductivity of the W7/HTM and W8/HTM layers compared to that of the WS2/HTM layer was observed, indicating an efficient charge transfer at the interfaces. The results obtained offer insights into the design of reliable and highly efficient ssDSSCs for large-scale applications.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017
Keyword
Aging of materials, Dyes and Chromophores, Photovoltaics, Physical and chemical properties
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-211086 (URN)10.1021/acsomega.7b00067 (DOI)
Note

QC 20170714

Available from: 2017-07-14 Created: 2017-07-14 Last updated: 2017-07-14Bibliographically approved
4. Design, synthesis and application of a π-conjugated, non-spiro molecular alternative as hole-transport material for highly efficient dye-sensitized solar cells and perovskite solar cells
Open this publication in new window or tab >>Design, synthesis and application of a π-conjugated, non-spiro molecular alternative as hole-transport material for highly efficient dye-sensitized solar cells and perovskite solar cells
Show others...
2017 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 344, 11-14 p.Article in journal (Refereed) Published
Abstract [en]

Two low-cost, easily synthesized π-conjugated molecules have been applied as hole-transport materials (HTMs) for solid state dye-sensitized solar cells (ssDSSCs) and perovskite solar cells (PSCs). For X1-based devices, high power conversion efficiencies (PCEs) of 5.8% and 14.4% in ssDSSCs and PSCs has been demonstrated. For X14-based devices, PCEs were improved to 6.1% and 16.4% in ssDSCs and PSCs, respectively.

Place, publisher, year, edition, pages
Elsevier, 2017
Keyword
Dye-sensitized solar cells, Hole-transport materials, Perovskite solar cells
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-201122 (URN)10.1016/j.jpowsour.2017.01.092 (DOI)2-s2.0-85010712174 (Scopus ID)
Funder
Swedish Research CouncilSwedish Energy AgencyKnut and Alice Wallenberg Foundation
Note

QC 20170208

Available from: 2017-02-08 Created: 2017-02-08 Last updated: 2017-07-14Bibliographically approved
5. Solution processable, cross-linked sulfur polymers as solid electrolytes in dye-sensitized solar cells
Open this publication in new window or tab >>Solution processable, cross-linked sulfur polymers as solid electrolytes in dye-sensitized solar cells
2015 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 51, no 78, 14660-14662 p.Article in journal (Refereed) Published
Abstract [en]

Inverse-vulcanized polymeric sulfur has been prepared and utilized for solid-state dye sensitized solar cells. A power conversion efficiency of 1.5% was recorded with a short-circuit current of 4.1 mA cm-2 and an open-circuit voltage of 0.75 V under standard AM 1.5G illumination (1000 W m-2). The results in the present study qualify the new polymeric sulfur material as a future candidate as low-cost, hole-transport material for solid-state dye-sensitized solar cells.

National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-174608 (URN)10.1039/c5cc04822b (DOI)000361540200024 ()2-s2.0-84941897046 (Scopus ID)
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationSwedish Energy Agency
Note

QC 20151207

Available from: 2015-12-07 Created: 2015-10-07 Last updated: 2017-07-14Bibliographically approved
6. Cross-linked sulfur-selenium polymers as hole transporting materials in dye-sensitized solar cells and perovskite solar cells,
Open this publication in new window or tab >>Cross-linked sulfur-selenium polymers as hole transporting materials in dye-sensitized solar cells and perovskite solar cells,
2017 (English)In: ChemphotoChemArticle in journal (Refereed) In press
Abstract [en]

Novel inverse-vulcanized polymeric sulfur–selenium materials (SeS2:S:DIB, where DIB=1,3-diisopropenylbenzene) have been prepared and utilized for solid-state dye-sensitized solar cellsand perovskite solar cells. Under standard AM 1.5G illumination (1000 Wm-2), a power conversion efficiency of 1.70% was recorded for polymeric sulfur–selenium–based (SeS2:S:DIB) solidstate solar cells, which is higher than that of polymeric sulfurbased (S:DIB) devices (1.09 %). For perovskite solar cells, a relatively high efficiency has been achieved for polymeric sulfur–selenium-based (SeS2:S:DIB) solar cells (10.21%) and polymeric sulfur-based (S:DIB; 7.32%) solar cells, respectively. The conductivity of the polymeric SeS material has been determined to 2.2410-4 Scm-1, which is higher than for the polymeric sulfur material under the same doping conditions. Photoinduced absorption and steady-state photoluminescence measurements were performed to investigate the charge-transfer properties relevant for the solar cells. The results in the present study qualify the new polymeric sulfur–selenium materials as candidates for low-cost hole-transport materials for photovoltaic devices.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2017
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-211088 (URN)10.1002/cptc.201700037 (DOI)
Note

QC 20170714

Available from: 2017-07-14 Created: 2017-07-14 Last updated: 2017-07-14Bibliographically approved

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Available from 2018-09-12 15:44

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