Alternative benzodithiophene (BDT) based polymeric hole transport layer for efficient perovskite solar cells

Eman A. Gaml, Ashish Dubey, Khan Mamun Reza, Md Nazmul Hasan, Nirmal Adhikari, Hytham Elbohy, Behzad Bahrami, Hamdy Zeyada, Shangfeng Yang, Qiquan Qiao

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


Organic-inorganic perovskite cell has shown a great deal of interest in past few years due to its ability to achieve high power conversion efficiency (PCE). Use of charge transport layers such as n-type TiO2 and p-type doped spiroOMeTAD in a n-i-p device architecture has shown enhanced perovskite solar cell device performance. Use of doped spiroOMeTAD as hole transport layer in the n-i-p device structure has been effective but possess disadvantages such as complex processing, use of corrosive additives, processing in ambient air for efficient hole doping. Here we report the study of solution processed benzodithiophene based polymer PBDTT-FTTE as an alternative hole transport layer to doped small molecule spiroOMeTAD. PBDT-FTTE doped with 3% DIO (diiodooctane) achieved PCE of 11.6% which was comparable to matching PCE of 11.6% obtained from using spiroOMeTAD as hole transport layer. We showed that unlike spiroOMeTAD, polymer PBDTT-FTTE is processed inside N2 filled glove box and is easier to process as compared to spiroOMeTAD which requires processing in ambient humid air and is doped with additives mixed in corrosive solvent, causing degradation to perovskite layer underneath.

Original languageEnglish (US)
Pages (from-to)8-13
Number of pages6
JournalSolar Energy Materials and Solar Cells
StatePublished - Aug 1 2017
Externally publishedYes


  • Doped spiroOMeTAD
  • Perovskite
  • Polymer PBDTT-FTTE
  • Solar cell

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films


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