Interface Modification of Inverted Structure PSBTBT:PC70BM Solar Cells for Improved Performance

Lal Mohammad, Abu Farzan Mitul, Sudhan Sigdel, Ashish Dubey, Devendra Khatiwada, Nirmal Adhikari, Hytham Elbohy, Qiquan Qiao

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


In this paper, we demonstrate that low-temperature-processed aluminum-doped zinc oxide (AZO)/ethoxylated polyethylenimine (PEIE) electron transport layer (ETL) significantly improves the performance of poly[(4,4′-bis(2- ethylhexyl) dithieno[3,2-b:2′,3′-d]silole)-2,6-diyl-alt-(2,1,3 benzothiadiazole)-4,7-diyl] (PSBTBT)-based inverted organic solar cells. Different metal oxides, including zinc oxide (ZnO), AZO, ZnO/PEIE, and AZO/PEIE, were used as ETL. The optical and morphological properties of ZnO, AZO, PEIE, and their combination layers were investigated in order to find the favorable ETLs for inverted structure PSBTBT:PC70BM solar cells. Transient photocurrent, photoinduced charge extraction by linearly increasing voltage, and atomic force microscopy were performed to understand the effects of charge transport, recombination, and morphological changes on device performance. Among the various layers, including ZnO, AZO, ZnO/PEIE, and AZO/PEIE, the low-temperature-processed AZO/PEIE combination ETL was the best performing interface layer that achieved the highest device fill factor and energy conversion efficiency.

Original languageEnglish (US)
Article number7279064
Pages (from-to)1659-1664
Number of pages6
JournalIEEE Journal of Photovoltaics
Issue number6
StatePublished - Sep 28 2015
Externally publishedYes


  • Electron transport layer
  • interface modification
  • metal oxide
  • organic solar cell

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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