Enhanced carrier extraction efficiency in organic solar cells with reduced space-charge limited transport by engineered vertical compositional profile

Ming Kun Lee, Tsung Han Kuo, Kuo Wen Kong, Yun Ru Hong, Jen Chun Wang, Sheng Fu Horng*, Hsin-Fei Meng

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

A multi-layered polymer solar cell (PSC) with a graded compositional profile to reduce space-charge limited (SCL) transport was designed and analyzed in details. We found that by increasing the effective carrier lifetime for the slower photo-carriers, SCL effects that degrade the fill factor and the power conversion efficiency can be alleviated in PSCs with a thick active layer. The reduction of SCL effects was evidenced by a diminished dependence of the incident photon-to-electron conversion efficiency (IPCE) on light bias, which also indicates the importance of light bias in characterizing the operating IPCE of PSCs with thick active layers which operate in SCL region. Based on our results, device architecture to enhance FF was proposed.

Original languageEnglish
Pages (from-to)1930-1935
Number of pages6
JournalSynthetic Metals
Volume162
Issue number21-22
DOIs
StatePublished - 1 Dec 2012

Keywords

  • Fillfactor
  • Layer thickness
  • Light bias
  • Polymer solar cells
  • Quantum efficiency
  • Space-charge limited effect

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