Impact of Carrier Traps on Charge Transport in the Composites of Poly(3- Hexylthiophene) an Fullerene Derivative for Organic Photovoltaics

Authors

  • Vaidotas KAŽUKAUSKAS Institute of Materials Science and Applied Research of Vilnius University
  • Mindaugas PRANAITIS Institute of Materials Science and Applied Research of Vilnius University
  • Andrius ARLAUSKAS Institute of Materials Science and Applied Research of Vilnius University

Keywords:

organic solar cells, inverted layer sequence, efficiency, carrier trapping, mobility.

Abstract

We have investigated impact of carrier trapping on charge transport in blends of poly(3-hexylthiophene) (P3HT) with
the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) that are important for the development of
organic Solar cells. The devices with quantum efficiency of 3.7 % fabricated in the inverted layer sequence were
analysed. We demonstrate that, though the fill factor of their Current-Voltage characteristics is as high as 68 %, carrier
trapping is effectively involved in the transport phenomena. The evaluated trapping state activation energy is about
0.18 eV and their density is up to (1020 ÷ 7×1021) cm–3. At such high densities these states presumably act as transport
states, limiting carrier mobility.

Downloads

Published

2010-03-07

Issue

Vol. 16 No. 1 (2010)

Section

ELECTRONIC AND OPTICAL MATERIALS

License

 

The copyrights for articles in this journal are retained by the author(s), with first publication rights granted to the journal. By virtue of their appearance in this open-access journal, articles are free to use with proper attribution in educational and other non-commercial settings.