Current Applied Physics

Korean Physical Society (한국물리학회)
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Performance improvements of organic solar cell using dual cathode buffer layers

  • Sachdeva, Sheenam (Center of Advanced Study in Physics, Panjab University) ;
  • Kaur, Jagdish (Center of Advanced Study in Physics, Panjab University) ;
  • Sharma, Kriti (Department of Physics, GGDSD College) ;
  • Tripathi, S.K. (Center of Advanced Study in Physics, Panjab University)
  • Received : 2018.07.18
  • Accepted : 2018.10.15
  • Published : 2018.12.31
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Abstract

The present study deals with the effect of dual cathode buffer layer (CBL) on the performance of bilayer of 4,4'-cyclohexylidenebis[N,N-bis(4-methylphenyl)benzenamine] (TAPC) and fullerene (C70)-based organic solar cell (OSC) with low donor concentration. OSC devices with CBLs have been fabricated using thermal vapor deposition technique. We report the use of lithium fluoride (LiF) and molybdenum trioxide ($MoO_3$) as CBLs. The insertion of LiF between C70 and aluminium (Al) electrode enhances the power conversion efficiency (PCE) of device from 1.89% to 2.47% but quenching of photogenerated excitons is observed at interface of C70 and LiF layers. Incorporation of $MoO_3$ between LiF and Al electrode further enhances PCE of device to 3.51%. This has also improved the material quality and device properties, by preventing the formation of gap states and diminishing exciton quenching.

Keywords

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