Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Development of Nanoparticle Sensitized Solar Cells
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, I have been working with the development of nanoparticle sensitized solar cells. In the subarea of quantum dot sensitized solar cells (QDSCs), I have investigated type-II quantum dots (QDs), quantum rods (QRs) and alloy QDs, and developed novel redox couples as electrolytes. I have also proposed upconversion nanoparticles as energy relay materials for dye-sensitized solar cells (DSCs).

Colloidal ZnSe/CdS type-II QDs were applied for QDSCs for the first time. The interesting features of those refer to that their photoelectrons and photoholes are located on the different parts of the dot, namely in the CdS shell and in the ZnSe core, respectively. That spatial separation between photoelectrons and photoholes can so effectively enhance the charge extraction efficiency, thus facilitating the electron injection, and also effectively expand the absorption spectrum. All these characteristics contribute to a high photon to current conversion efficiency. Furthermore, a comparison between the photovoltaic performance of ZnSe/CdS and CdS/ZnSe QDSCs shows that the electron distribution is important for the electron injection of the QDs.

Colloidal CdS/CdSe QRs were applied to quantum rod-sensitized solar cells (QRSCs). They showed a higher electron injection efficiency than the analogous QDSCs. It is concluded that reduction of the carrier confinement dimensions of the nanoparticles can improve the electron injection efficiency of the nanoparticle sensitized solar cells.

Two types of organic electrolytes based on the redox couples of McMT-/BMT (OS1) and TMTU/TMTU-TFO (OS2) were used for the QDSCs. By reducing the charge recombination between the electrolyte and the counter electrode, the fill factor and the photovoltage of these QDSCs were significantly improved, resulting in a higher efficiency for the studied solar cells than that with a commonly used inorganic electrolyte.

Ternary-alloy PbxCd1-xS QDs used as photosensitizers for QDSCs were found to improve the photocurrent compared to the corresponding CdS and PbS QDs. By considering the effect of different ratios of Pb to Cd in thePbxCd1-xS QDs on the photovoltaic performance it was discovered that the photocurrent increases and the photovoltage decreases with the increase of the ratio in a certain range.

Upconversion (UC) nanoparticles provide a strategy to develop panchromatic solar cells. Three types of UC nanoparticles employed by DSCs were confirmed to work as energy relay materials for effectively extending the light-harvesting spectrum to the near-infrared (NIR) region. They were also found to play a role as scattering centers to enhance the photovoltaic performance of the solar cells.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. , 70 p.
Series
Trita-BIO-Report, ISSN 1654-2312 ; 2013:16
Keyword [en]
quantum dots, quantum rods, nanoparticles, solar cells, colloidal, type-II, electron extraction, alloy, organic electrolyte, energy relay, upconversion.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-129382ISBN: 978-91-7501-862-1 (print)OAI: oai:DiVA.org:kth-129382DiVA: diva2:652004
Public defence
2013-10-24, FB42, AlbaNova University Center, Roslagstullsbacken 21, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

QC 20131002

Available from: 2013-10-02 Created: 2013-09-28 Last updated: 2013-10-02Bibliographically approved
List of papers
1. Use of colloidal upconversion nanocrystals for energy relay solar cell light harvesting in the near-infrared region
Open this publication in new window or tab >>Use of colloidal upconversion nanocrystals for energy relay solar cell light harvesting in the near-infrared region
Show others...
2012 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 22, no 33, 16709-16713 p.Article in journal (Refereed) Published
Abstract [en]

Colloidal upconversion (UC) nanocrystals were explored as energy relay materials for dye-sensitized solar cells for the first time. The utilization of colloidal UC nanocrystals was found to significantly enhance the upconversion efficiency and improve the photocurrent of the cells for low infrared irradiation intensity. In addition, it was found that UC nanocrystals of small size favor infiltration into a TiO2 film and bring higher relay efficiency. Finally, we found that UC nanocrystals can serve as a scattering material to increase the light absorption capability of the cells and increase the overall photocurrent of the cells under simulated sunlight irradiation.

Keyword
Tio2 Films, Photoluminescence, Nanophosphors, Scattering, Efficiency, Fluorescence, Electrolyte, Sensitizer, Phase, Layer
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-102144 (URN)10.1039/c2jm16127c (DOI)000306972900003 ()2-s2.0-84865523343 (Scopus ID)
Funder
Swedish e‐Science Research Center
Note

QC 20120910

Available from: 2012-09-10 Created: 2012-09-10 Last updated: 2017-12-07Bibliographically approved
2. Effective Dual-NIR-Wavelength Energy Relay of Colloidal Upconversion Nanocrystals for Dye-sensitized Solar Cells
Open this publication in new window or tab >>Effective Dual-NIR-Wavelength Energy Relay of Colloidal Upconversion Nanocrystals for Dye-sensitized Solar Cells
Show others...
(English)Manuscript (preprint) (Other academic)
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-129380 (URN)
Note

QS 2013

Available from: 2013-09-28 Created: 2013-09-28 Last updated: 2013-10-02Bibliographically approved
3. A Strategy to Improve Photocurrent in Quantum Dot Sensitized Solar Cells by Employing Alloy PbxCd1-xS QDs as Photosensitizers
Open this publication in new window or tab >>A Strategy to Improve Photocurrent in Quantum Dot Sensitized Solar Cells by Employing Alloy PbxCd1-xS QDs as Photosensitizers
Show others...
(English)Manuscript (preprint) (Other academic)
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-129381 (URN)
Note

QS 2013

Available from: 2013-09-28 Created: 2013-09-28 Last updated: 2013-10-02Bibliographically approved
4. Solar cells sensitized with type-II ZnSe-CdS core/shell colloidal quantum dots
Open this publication in new window or tab >>Solar cells sensitized with type-II ZnSe-CdS core/shell colloidal quantum dots
Show others...
2011 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 47, no 5, 1536-1538 p.Article in journal (Refereed) Published
Abstract [en]

Type-II quantum dots (QDs) were applied for QDs-sensitized solar cells for the first time and showed prominent absorbed photon to current conversion efficiency.

Keyword
SELF-ASSEMBLED LAYERS, SEMICONDUCTOR NANOCRYSTALS, TIO2 NANOSTRUCTURES, ELECTRON INJECTION, SHAPE CONTROL
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-30262 (URN)10.1039/c0cc03401k (DOI)000286389500042 ()2-s2.0-78751549134 (Scopus ID)
Funder
Swedish e‐Science Research Center
Note

QC 20110222

Available from: 2011-02-22 Created: 2011-02-21 Last updated: 2017-12-11Bibliographically approved
5. Quantum rod-sensitized solar cells
Open this publication in new window or tab >>Quantum rod-sensitized solar cells
Show others...
2011 (English)In: ChemSusChem, ISSN 1864-5631, Vol. 4, no 12, 1741-1744 p.Article in journal (Refereed) Published
Abstract [en]

An electron injection highway: CdSe nanorods with CdS seed material were applied to a quantum rod-sensitized TiO 2 solar cell that showed a higher electron injection efficiency than analogous quantum dot-sensitized solar cells: reducing the nanocrystals carrier confinement dimensions can improve electron injection efficiency of nanocrystal-sensitized solar cells.

Keyword
colloids, electron transport, nanostructures, quantum chemistry, solar cells
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-86070 (URN)10.1002/cssc.201100582 (DOI)000297953400004 ()2-s2.0-83455200095 (Scopus ID)
Note

QC 20120217

Available from: 2012-02-16 Created: 2012-02-13 Last updated: 2016-12-22Bibliographically approved
6. Type-II colloidal quantum dot sensitized solar cells with a thiourea based organic redox couple
Open this publication in new window or tab >>Type-II colloidal quantum dot sensitized solar cells with a thiourea based organic redox couple
Show others...
2012 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 22, no 13, 6032-6037 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, one kind of organic electrolyte based on tetramethylthiourea is employed for quantum dot sensitized solar cells (QDSCs). By reducing the impedance between the electrolyte and the counter electrode, the fill factor of such organic electrolyte based QDSCs is significantly improved. It is possible to substantially increase the photovoltage and to reach an efficiency three times higher than that of a commonly used inorganic electrolyte. The light harvesting ability of the organic electrolyte based QDSCs is successfully extended by using type-II QDs, where the adsorption of ZnS gives an additional advantage in further enhancing the stability of the cells. It is observed that core/shell ZnSe/CdS type-II QDs give higher electron injection than CdS/ZnSe QDs, proving that the electron distribution in the QDs is important for the electron extraction. A full working mechanism of the organic redox couple for the QDSCs is proposed.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2012
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-93024 (URN)10.1039/c2jm15857d (DOI)000301195300021 ()2-s2.0-84863268306 (Scopus ID)
Funder
Knut and Alice Wallenberg FoundationSwedish e‐Science Research Center
Note

QC 20120410

Available from: 2012-04-10 Created: 2012-04-10 Last updated: 2017-12-07Bibliographically approved
7. Pure Organic Redox Couple for Quantum-Dot-Sensitized Solar Cells
Open this publication in new window or tab >>Pure Organic Redox Couple for Quantum-Dot-Sensitized Solar Cells
Show others...
2011 (English)In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 17, no 23, 6330-6333 p.Article in journal (Refereed) Published
Keyword
optoelectronic materials, organic electrolytes, quantum dots, redox chemistry, solar cells
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-36253 (URN)10.1002/chem.201003527 (DOI)000292095800008 ()2-s2.0-79957996455 (Scopus ID)
Funder
Swedish e‐Science Research Center
Note

QC 20110711

Available from: 2011-07-11 Created: 2011-07-11 Last updated: 2017-12-11Bibliographically approved

Open Access in DiVA

fulltext(2238 kB)2189 downloads
File information
File name FULLTEXT01.pdfFile size 2238 kBChecksum SHA-512
883357d225db0eb03826d21301ada2eac1ae84359c1dcab14215e2d8c6ecf99848778cd6d72e6bd05e5d9fe596accd580fc3cd35c676a0a0ecc154ca17e24b4b
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Yuan, Chunze
By organisation
Theoretical Chemistry and Biology
Chemical Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 2189 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 539 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf