Necessity of interlayer in tandem organic solar cells composed of a bulk heterojunction unit cell and the equivalent circuit

Shuo Lan, Yoshinori Kimoto, Katsuhiko Fujita

Research output: Contribution to journalArticle

Abstract

In an inverted tandem organic solar cell with a bulk heterojunction (BHJ) unit cell, strange s-shape appears in the current-voltage characteristics. We prepared a tandem cell composed of a BHJ bottom unit cell and a p-n stack type top unit cell with an interlayer in between the unit cells. Since the BHJ active layer has symmetric structure, an electron blocking layer is indispensable in the interlayer. The photovoltaic characteristics can be reproduced by an equivalent circuit with an inverted diode between two unit cells. The s-shape can be understood in terms of the reverse rectification by the electron blocking layer.

Original languageEnglish
Pages (from-to)249-255
Number of pages7
JournalMolecular Crystals and Liquid Crystals
Volume654
Issue number1
DOIs
Publication statusPublished - Sep 2 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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