High performance planar perovskite solar cells with a perovskite of mixed organic cations and mixed halides, MA1-xFAxPbI3-yCly

Furkan H. Isikgor, Bichen Li, Hai Zhu, Qinghua Xu, Jianyong Ouyang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

Hybrid organic-inorganic perovskite solar cells (PSCs) have attracted great interest owing to their low fabrication costs and high power conversion efficiency. Most studies have focused on the devices with methylammonium lead trihalide perovskites. Here, we explore a new perovskite with mixed organic cations and mixed halides, MA1-xFAxPbI3-yCly. MA1-xFAxPbI3-yCly films can be fabricated by annealing at a temperature of 80-110 °C. Planar heterojunction PSCs using this perovskite as the active material can exhibit a high power conversion efficiency (PCE) of up to 18.14% with short-circuit photocurrent density (Jsc) of 21.55 ± 0.55 mA cm-2, open-circuit voltage (Voc) of 1.100 ± 0.010 V, and fill factor (FF) of 0.75 ± 0.02. The PCE is much higher than those of the control devices with other commonly employed perovskites including MAPbI3, MAPbI3-yCly, MAPbI3-yBry, and MA1-xFAxPbI3. The superior performance is mainly attributed to the enhancement of Jsc, which is a result of long charge diffusion lengths due to the presence of mixed organic cations and mixed halides. In addition, there is no obvious hysteresis in the J-V curves along the forward and reverse scan directions. The formation of undesirable δ-phase perovskite that has a band gap of 2.8 eV is not observed in the MA1-xFAxPbI3-yCly films. These findings pave the way for the design of new hybrid perovskites with stronger light absorption over a wide range, lower charge recombination, and improved charge transport properties through compositional engineering.

Original languageEnglish (US)
Pages (from-to)12543-12553
Number of pages11
JournalJOURNAL OF MATERIALS CHEMISTRY A
Volume4
Issue number32
DOIs
StatePublished - 2016

Bibliographical note

Funding Information:
This research work was financially supported by a research grant from the Ministry of Education, Singapore (R284-000-147-112).

Publisher Copyright:
© 2016 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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