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  • Bao, QinyeLinköpings universitet,Ytors Fysik och Kemi,Tekniska högskolan (author)

Trap-Assisted Recombination via Integer Charge Transfer States in Organic Bulk Heterojunction Photovoltaics

  • Article/chapterEnglish2014

Publisher, publication year, extent ...

  • 2014-08-18
  • Wiley-VCH Verlag,2014
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:liu-112635
  • https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-112635URI
  • https://doi.org/10.1002/adfm.201401513DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Funding Agencies|Swedish Energy Agency [34142-1]; European Commission [287594]; Academy of Finland [137093]; Swedish Research Council Linnaeus grant LiLi-NFM; Waldemar von Frenckell Foundation; Swedish Cultural Foundation in Finland; Advanced Functional Materials Center at Linkoping University
  • Organic photovoltaics are under intense development and significant focus has been placed on tuning the donor ionization potential and acceptor electron affinity to optimize open circuit voltage. Here, it is shown that for a series of regioregular-poly(3-hexylthiophene): fullerene bulk heterojunction (BHJ) organic photovoltaic devices with pinned electrodes, integer charge transfer states present in the dark and created as a consequence of Fermi level equilibrium at BHJ have a profound effect on open circuit voltage. The integer charge transfer state formation causes vacuum level misalignment that yields a roughly constant effective donor ionization potential to acceptor electron affinity energy difference at the donor-acceptor interface, even though there is a large variation in electron affinity for the fullerene series. The large variation in open circuit voltage for the corresponding device series instead is found to be a consequence of trap-assisted recombination via integer charge transfer states. Based on the results, novel design rules for optimizing open circuit voltage and performance of organic bulk heterojunction solar cells are proposed.

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  • Sandberg, OskarAbo Akad University, Finland (author)
  • Dagnelund, DanielLinköpings universitet,Funktionella elektroniska material,Tekniska högskolan(Swepub:liu)danda64 (author)
  • Sanden, SimonAbo Akad University, Finland (author)
  • Braun, SlawomirLinköpings universitet,Ytors Fysik och Kemi,Tekniska högskolan(Swepub:liu)slama19 (author)
  • Aarnio, HarriAbo Akad University, Finland (author)
  • Liu, XianjieLinköpings universitet,Ytors Fysik och Kemi,Tekniska högskolan(Swepub:liu)xiali21 (author)
  • Chen, WeiminLinköpings universitet,Funktionella elektroniska material,Tekniska högskolan(Swepub:liu)weich55 (author)
  • Osterbacka, RonaldAbo Akad University, Finland (author)
  • Fahlman, MatsLinköpings universitet,Ytors Fysik och Kemi,Tekniska högskolan(Swepub:liu)matfa21 (author)
  • Linköpings universitetYtors Fysik och Kemi (creator_code:org_t)

Related titles

  • In:Advanced Functional Materials: Wiley-VCH Verlag24:40, s. 6309-63161616-301X1616-3028

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