2D black phosphorous nanosheets as a hole transporting material in perovskite solar cells

Subas Kumar Muduli, Eswaraiah Varrla, Sneha Avinash Kulkarni, Guifang Han, Krishnamoorthy Thirumal, Ovadia Lev, Subodh Mhaisalkar*, Nripan Mathews

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

We demonstrate for the first-time liquid exfoliated few layers of 2D Black phosphorus (BP) nanosheets as a hole transporting material (HTM) for perovskite based solar cells. The photoelectron spectroscopy in air (PESA) measurements confirm the low laying valence band level of BP nanosheets (−5.2 eV) favourable for hole injection from CH3NH3PbI3 (MAPbI3). Our results show that ∼25% improvement in power conversion efficiency (PCE) of η = 16.4% for BP nanosheets + Spiro-OMeTAD as an HTM as compared to spiro-OMeTAD (η = 13.1%). When BP nanosheets are exclusively utilised as an HTM, a PCE of η = 7.88% is noted, an improvement over the 4% PCE values observed for HTM free devices. Photoluminescence (PL) quenching of MAPbI3 and impedance measurements further confirm the charge extraction ability of BP nanosheets. The structural and optical characterization of liquid exfoliated BP nanosheets is discussed in detail with the aid of transmission electron microscopy, Raman spectroscopy, absorption spectroscopy and photo-electron spectroscopy.

Original languageAmerican English
Pages (from-to)156-161
Number of pages6
JournalJournal of Power Sources
Volume371
DOIs
StatePublished - 15 Dec 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

  • Black phosphorus (BP)
  • HTM
  • MAPbI
  • Perovskite
  • Solar cells

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