Effect of formamidinium (FA) ions on mixed ‘A’-site based bromide perovskite (APbBr3) thin films

Deepak Aloysius, Arindam Mondal, Satyajit Gupta, Eran Edri, Sabyasachi Mukhopadhyay

Research output: Contribution to journalArticlepeer-review

Abstract

Hybrid organic-inorganic perovskites (HOIPs) have become promising candidates for future photovoltaics (PV) with significant advancements in their performance over recent years. Along with PV, HOIPs possess applications in photodiodes, photodetectors, photocatalysis, and memory devices. Generally, perovskites are structurally flexible to accommodate various cations on their respective sites through compositional engineering, thereby altering the characteristic material properties of the system. HOIPs have ABX3 structures, in which organic or inorganic moieties occupy the monovalent ‘A’ site. In this work, the effect of formamidinium (FA) on the optical and morphological properties of HOIPs using two different bromide perovskites - FA0.5MA0.4Cs0.1PbBr3 and MA0.9Cs0.1PbBr3 - is examined. After ‘FA’ modification, we noticed a reduction in the bandgap and an increase in the grain size of the FA0.5MA0.4Cs0.1PbBr3 perovskite compared with the MA0.9Cs0.1PbBr3 perovskite. As a result, a better photocurrent response during photoelectrochemical analysis and an improved power conversion efficiency (PCE) for photovoltaic devices were detected with the FA-modified HOIP (FA0.5MA0.4Cs0.1PbBr3).

Original languageEnglish
Pages (from-to)22229-22236
Number of pages8
JournalNew Journal of Chemistry
Volume46
Issue number46
DOIs
StatePublished - 21 Oct 2022

ASJC Scopus subject areas

  • Catalysis
  • Chemistry (all)
  • Materials Chemistry

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