Overcoming the Interface Losses in Planar Heterojunction Perovskite-Based Solar Cells

Yi Hou*, Wei Chen, Derya Baran, Tobias Stubhan, Norman A. Luechinger, Benjamin Hartmeier, Moses Richter, Jie Min, Shi Chen, Cesar Omar Ramirez Quiroz, Ning Li, Hong Zhang, Thomas Heumueller, Gebhard J. Matt, Andres Osvet, Karen Forberich, Zhi Guo Zhang, Yongfang Li, Benjamin Winter, Peter SchweizerErdmann Spiecker, Christoph J. Brabec

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

149 Scopus citations

Abstract

An experiment was conducted to demonstrate that low-temperature processed NiO-based nanocrystal ink (LT-NiO) has the potential to form an almost loss-free hole selective interface for flat heterojunction perovskite-based solar cells. First, The patterned ITO substrates were ultrasonic cleaned with acetone and isopropanol for 10 min each. On cleaned ITO substrate, a dense and smooth layer of LT-NiO was deposited by spin coating and followed by annealing at 70?230°C for 10 min in air to remove organic components. The as-prepared perovskite precursor solution was filtered using 0.45 μm PTFE syringe filter and coated onto the ITO/LT-NiO substrate at a speed of 4000 r.p.m. for 35 s. J-V characteristics of all the devices were measured using a source measurement unit from BoTest. FTPS:FTPS-EQE measurements were carried out using a Vertex 70 from Brucker optics, equipped with QTH lamp, quartz beam splitter and external detector option. A major improvement in open circuit voltage is found by replacing PEDOT:PSS with LT-NiO. A detailed analysis reveals that LT-NiO significantly reduces non-radiative recombination at the PEDOT:PSS/perovskite interface and further enhances the radiative LED efficiency towards unity which brings open circuit voltage closer to the radiative limit.

Original languageEnglish (US)
Pages (from-to)5112-5120
Number of pages9
JournalAdvanced Materials
Volume28
Issue number25
DOIs
StatePublished - Jan 1 2016

Keywords

  • low temperature processing
  • nickel oxide
  • non-radiative voltage loss
  • perovskite solar cells

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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