Towards low-temperature processing of efficient γ-CsPbI3 perovskite solar cells

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

Abstract

Inorganic cesium lead iodide (CsPbI3) perovskite solar cells (PSCs) have attracted enormous attention due to their excellent thermal stability and optical bandgap (∼1.73 eV), well-suited for tandem device applications. However, achieving high-performance photovoltaic devices processed at low temperatures is still challenging. Here we reported a new method for the fabrication of high-efficiency and stable γ-CsPbI3 PSCs at lower temperatures than was previously possible by introducing the long-chain organic cation salt ethane-1,2-diammonium iodide (EDAI2) and regulating the content of lead acetate (Pb(OAc)2) in the perovskite precursor solution. We find that EDAI2 acts as an intermediate that can promote the formation of γ-CsPbI3, while excess Pb(OAc)2 can further stabilize the γ-phase of CsPbI3 perovskite. Consequently, improved crystallinity and morphology and reduced carrier recombination are observed in the CsPbI3 films fabricated by the new method. By optimizing the hole transport layer of CsPbI3 inverted architecture solar cells, we demonstrate efficiencies of up to 16.6%, surpassing previous reports examining γ-CsPbI3 in inverted PSCs. Notably, the encapsulated solar cells maintain 97% of their initial efficiency at room temperature and under dim light for 25 days, demonstrating the synergistic effect of EDAI2 and Pb(OAc)2 in stabilizing γ-CsPbI3 PSCs.

Details

Original languageEnglish
Pages (from-to)16115-16126
Number of pages12
JournalJournal of Materials Chemistry A
Volume11
Issue number30
Publication statusPublished - 10 Jul 2023
Peer-reviewedYes

External IDs

WOS 001027880200001

Keywords

Sustainable Development Goals

Keywords

  • Cspbi3 perovskite, Ambient-air, Performance, Films, Quality, Fabrication, Interfaces, Layers, Phase