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The role of the hole-transport layer in perovskite solar cells - reducing recombination and increasing absorption
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology. Swiss Federal Institute Technology EPFL, Switzerland.
Swiss Federal Institute Technology EPFL, Switzerland.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Swiss Federal Institute Technology EPFL, Switzerland.
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2014 (English)In: 2014 IEEE 40TH PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC), IEEE , 2014, 1563-1566 p.Conference paper (Refereed)
Abstract [en]

The role of the hole-transport layer (HTL) in CH3NH3PbI3 perovskite solar cells is investigated. It is found that it mainly serves three purposes: First, deposited prior to the gold electrode, it avoids direct contact of the metal electrode with the meso porous TiO2-perovskite layer, and therefore increases the selectivity of the contact. This reduces recombination as evident from an increased open-circuit voltage and a higher luminescence efficiency. Second, the HTL increases the internal quantum efficiency independent of applied voltage and illumination wavelength by reducing (diffusion) losses of charges. Third, due to a smoothing of the TiO2-perovskite mesoscopic layer the HTL increases the reflectivity of the gold electrode, allowing for a second path of the light through the absorber. Both effects result in an enhancement of the short-circuit current density.

Place, publisher, year, edition, pages
IEEE , 2014. 1563-1566 p.
Keyword [en]
solar cell; perovskite; recombination; hole transport layer; luminescence; internal quantum efficiency; incident-photon-to-electron conversion efficiency
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-132320DOI: 10.1109/PVSC.2014.6925216ISI: 000366638901174ISBN: 978-1-4799-4398-2OAI: oai:DiVA.org:liu-132320DiVA: diva2:1043661
Conference
40th IEEE Photovoltaic Specialists Conference (PVSC)
Available from: 2016-10-31 Created: 2016-10-31 Last updated: 2016-11-12

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Tress, WolfgangInganäs, Olle
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Biomolecular and Organic ElectronicsThe Institute of TechnologyFaculty of Science & Engineering
Condensed Matter Physics

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