Electrode considerations for the optical enhancement of organic bulk heterojunction solar cells

Afshin Hadipour, David Cheyns, Paul Heremans, Barry P. Rand

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

In this paper, we consider the optical effects in conventional and inverted bulk heterojunction organic solar cells associated with various electrodes, and perform a systematic study on the anode and cathode buffer layers commonly used in high performance devices. In the devices produced here, we determine that parasitic absorption by low work function metals such as calcium reduces photocurrent by 25%, and that parasitic refl ection at interfaces between the transparent conducting oxide and metal oxide buffer layers can reduce photocurrent by more than 10%. We also quantify the impact of an optical spacer, and determine that this accounts for only a fraction of the improvement that can be gained through alternative electrode optimization routes. It is therefore our intention that this study serves as a guideline for the optimization of the electrodes of organic thin film photovoltaic devices.

Original languageEnglish (US)
Pages (from-to)930-935
Number of pages6
JournalAdvanced Energy Materials
Volume1
Issue number5
DOIs
StatePublished - Oct 1 2011

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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