Controllable Sequential Deposition of Planar CH3NH3PbI3 Perovskite via Adjustable Volume Expansion

Kai Zhu, Taiyang Zhang, Yixin Zhao, Mengjin Yang

Research output: Contribution to journalArticlepeer-review

242 Scopus Citations

Abstract

We demonstrate a facile morphology-controllable sequential deposition of planar CH3NH3PbI3 (MAPbI3) film by using a novel volume-expansion-adjustable PbI2·xMAI (x: 0.1-0.3) precursor film to replace pure PbI2. The use of additive MAI during the first step of deposition leads to the reduced crystallinity of PbI2 and the pre-expansion of PbI2 into PbI2·xMAI with adjustable morphology, which result in about 10-fold faster formation of planar MAPbI3 film (without PbI2 residue) and thus minimize the negative impact of the solvent isopropanol on perovskites during the MAI intercalation/conversion step. The best efficiency obtained for a planar perovskite solar cell based on PbI2·0.15MAI is 17.22% (under one sun illumination), which is consistent with the stabilized maximum power output at an efficiency of 16.9%. (Graph Presented).

Original languageAmerican English
Pages (from-to)3959-3963
Number of pages5
JournalNano Letters
Volume15
Issue number6
DOIs
StatePublished - 10 Jun 2015

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-63455

Keywords

  • perovskite
  • sequential deposition
  • solar cells
  • volume expansion

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