Evidence for exciton quenching by hole polarons in thick P3HT: PCBM solar cells

D. Gupta, T.G.J. van der Hofstad, R.A.J. Janssen, S.C.J. Meskers

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Abstract

Loss mechanisms near each of the two electrodes of semitransparent solar cells with ZnO and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) contacts are investigated as function of the thickness of the photoactive poly(3-hexylthiophene) : methanofullerene (P3HT:PCBM) bulk heterojunction layer (200-500 nm). Varying the intensity of the illumination through the ZnO contact indicates that bimolecular recombination is an important loss mechanism. Illumination through the PEDOT:PSS contact reveals a loss mechanism that is independent of light intensity. Photoluminescence measurements demonstrate that primary P3HT excitons can be quenched by charge carriers that diffuse into the active layer from the PEDOT:PSS contact.

Original languageEnglish
Title of host publication2016 3rd International Conference on Emerging Electronics, ICEE 2016
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
ISBN (Electronic)978-1-5090-3659-2
DOIs
Publication statusPublished - 18 Oct 2017
Event3rd International Conference on Emerging Electronics (ICEE 2016) - Indian Institute of Technology, Mumbai, India
Duration: 27 Dec 201630 Dec 2016
Conference number: 3

Conference

Conference3rd International Conference on Emerging Electronics (ICEE 2016)
Abbreviated titleICEE
CountryIndia
CityMumbai
Period27/12/1630/12/16

Keywords

  • conjugated polymers
  • exciton diffusion
  • organic electronics
  • organic solar cells
  • P3HT
  • PCBM
  • semitransparent contact

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