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Constructive Effects of Alkyl Chains: A Strategy to Design Simple and Non-Spiro Hole Transporting Materials for High-Efficiency Mixed-Ion Perovskite Solar Cells
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
KTH Royal Inst Technol, Dept Chem Chem Sci & Engn, Organ Chem, Ctr Mol Devices, SE-10044 Stockholm, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
Ecole Polytech Fed Lausanne, EPFL FSB ISIC LSPM, Lab Photomol Sci, Inst Chem Sci & Engn, Chemin Alambics Stn 6, CH-1015 Lausanne, Switzerland.;Ferdowsi Univ Mashhad, Dept Chem, Mashhad 91779, Iran..
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2016 (English)In: ADVANCED ENERGY MATERIALS, ISSN 1614-6832, Vol. 6, no 13, 1502536Article in journal (Refereed) PublishedText
Place, publisher, year, edition, pages
2016. Vol. 6, no 13, 1502536
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-300464DOI: 10.1002/aenm.201502536ISI: 000379314700002OAI: oai:DiVA.org:uu-300464DiVA: diva2:951451
Funder
Swedish Energy AgencyStandUpSwedish Research CouncilKnut and Alice Wallenberg FoundationSwedish Research Council Formas
Available from: 2016-08-09 Created: 2016-08-09 Last updated: 2016-08-25Bibliographically approved
In thesis
1. Organic Hole Transport Materials for Solid-State Dye-Sensitized and Perovskite Solar Cells
Open this publication in new window or tab >>Organic Hole Transport Materials for Solid-State Dye-Sensitized and Perovskite Solar Cells
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Solid-state dye-sensitized solar cells (ssDSSCs) and recently developed perovskite solar cells (PSCs) have attracted a great attention in the scientific field of photovoltaics due to their low cost, absence of solvent, simple fabrication and promising power conversion efficiency (PCE). In these types of solar cell, the dye molecule or the perovskite can harvest the light on the basis of electron excitation. Afterwards, the electron and hole are collected at the charge transport materials.

Photoelectrochemical polymerization (PEP) is employed in this thesis to synthesize conducting polymer hole transport materials (HTMs) for ssDSSCs. We have for the first time developed aqueous PEP in comparison with the conventional organic PEP with acetonitrile as solvent. This water-based PEP could potentially provide a low-cost, environmental-friendly method for efficient deposition of polymer HTM for ssDSSCs. In addition, new and simple precursors have been tested with PEP method. The effects of dye molecules on the PEP were also systematically studied, and we found that (a) the bulky structure of dye is of key importance for blocking the interfacial charge recombination; and (b) the matching of the energy levels between the dye and the precursor plays a key role in determining the kinetics of the PEP process.

In PSCs, the HTM layer is crucial for efficient charge collection and its long term stability. We have studied different series of new molecular HTMs in order to understand fundamentally the influence of alkyl chains, molecular energy levels, and molecular geometry of the HTM on the photovoltaic performance. We have identified several important factors of the HTMs for efficient PSCs, including high uniformity of the HTM capping layer, perovskite-HTM energy level matching, good HTM solubility, and high conductivity. These factors affect interfacial hole injection, hole transport, and charge recombination in PSCs. By systematical optimization, a promising PCE of 19.8% has been achieved by employing a new HTM H11. We believe that this work could provide important guidance for the future development of new and efficient HTMs for PSCs.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. 83 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1408
Keyword
photoelectrochemical polymerization, PEDOT, dye, hole transport material, small molecule, perovskite solar cell
National Category
Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-300802 (URN)978-91-554-9659-3 (ISBN)
Public defence
2016-10-07, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
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Available from: 2016-09-15 Created: 2016-08-14 Last updated: 2016-09-22

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Zhang, JinbaoJohansson, Malin B.Johansson, Erik M. J.Boschloo, Gerrit
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