Simultaneous enhancement in both large-area coatability and photovoltaic performance of inverted organic solar cells with co-solvent

Yun Ru Hong, Pin Kuan Chen, Jen Chun Wang, Ming Kun Lee, Sheng Fu Horng*, Hsin-Fei Meng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We report our observation of simultaneous enhancement in large-area coatability and photovoltaic performance for blade-coated inverted P3HT:PCBM organic solar cells with DCB:hexane co-solvent. The addition of hexane improves greatly the wettability of P3HT:PCBM blend layer on Cs2CO3 treated ITO and leads to excessively higher P3HT surface concentration due to the incongruent evaporation of hexane and DCB. A post-processing light soaking was found to further improve the photovoltaic performance for blade-coated devices prepared with co-solvent by adjusting the P3HT surface concentration ratio for more favorable carrier transport, as evidenced by the disappearance of current suppression at forward bias and significant increase in Voc after light soaking. Since large-area manufacturing is the key to full commercialization of organic solar cells, the use of co-solvent, combined with light soaking, may be crucial for the development of inverted organic solar cells.

Original languageEnglish
Pages (from-to)197-203
Number of pages7
JournalSolar Energy Materials and Solar Cells
Volume120
Issue numberPART A
DOIs
StatePublished - 1 Jan 2014

Keywords

  • Blade coating
  • Co-solvent
  • Large area manufacturing
  • Light soaking
  • Organic solar cells

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