Decent efficiency improvement of organic photovoltaic cell with low acidic hole transport material by controlling doping concentration

Swarup Biswas, Young Jun You, Jisoo Kim, Su Ryong Ha, Hyosung Choi, Soon Hwan Kwon, Kyoung Kook Kim, Jae Won Shim, Hyeok Kim

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Presently, poly (3, 4-ethylenedi-oxythiophene): polystyrene sulfonic acid (PEDOT:PSS) is most commonly used hole transport material (HTM) in photovoltaic (PV) cells but its higher acidity, hygroscopicity, high price have motivated people to develop a good substitute. Here, we prepare a series of PSS doped polyaniline (PANI) with synergic (around 90%) transmittance and work function value (within 5.09–5.16 eV) varying PSS concentrations to check the possible utility as HTM in a poly (3-hexylthiophene): [6,6]-indene-C60 bisadduct based organic photovoltaic (OPV) cell. Here, it is observed that, because of change in conductivity, the PV performance of those OPV devices is strongly dependent on the doping concentration of the HTM and, at optimized PSS concentration, PANI:PSS has higher conductivity. This facilitates better hole extraction efficiency into the PV device and results in higher short circuit current density (JSC). Therefore, the PANI:PSS-based OPV device with optimized PSS concentration exhibits same level of power conversion efficiency (PCE: 4.5 ± 0.2%) as a PEDOT:PSS based OPV device. Thus, a lower acidic (pH = 2.2) p-type semiconductor PANI:PSS (weight ratio = 1:1 and) can be a good alternative to highly acidic (pH = 1.7) PEDOT:PSS (weight ratio = 1:6, Clevious Al 4083) for using as HTM in an OPV device.

Original languageEnglish
Article number145700
JournalApplied Surface Science
Volume512
DOIs
StatePublished - 15 May 2020

Keywords

  • Doping concentration
  • Hole transport layer
  • Organic photovoltaic cell
  • Poly (4-styrenesulfonic acid) doped poly (3,4-ethylenedi-oxythiophene)
  • Poly (4-styrenesulfonic acid) doped polyaniline

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