Abstract
Wide-bandgap perovskite solar cells (PSCs) based on organolead (I, Br)-mixed halide perovskites (e.g., MAPbI2Br and MAPbIBr2 perovskite with bandgaps of 1.77 and 2.05 eV, respectively) are considered as promising low-cost alternatives for application in tandem or multijunction photovoltaics (PVs). Here, we demonstrate that manipulating the crystallization behavior of (I, Br)-mixed halide perovskites in antisolvent bath is critical for the formation of smooth, dense thin films of these perovskites. Since the growth of perovskite grains from a precursor solution tends to be more rapid with increasing Br content, further enhancement in the nucleation rate becomes necessary for the effective decoupling of the nucleation and the crystal-growth stages in Br-rich perovskites. This is enabled by introducing simple stirring during antisolvent-bathing, which induces enhanced advection transport of the extracted precursor-solvent into the bath environment. Consequently, wide-bandgap planar PSCs fabricated using these high quality mixed-halide perovskite thin films, Br-rich MAPbIBr2, in particular, show enhanced PV performance.
Original language | American English |
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Pages (from-to) | 2232-2237 |
Number of pages | 6 |
Journal | ACS Applied Materials and Interfaces |
Volume | 8 |
Issue number | 3 |
DOIs | |
State | Published - 27 Jan 2016 |
Bibliographical note
Publisher Copyright:© 2016 American Chemical Society.
NREL Publication Number
- NREL/JA-5900-65869
Keywords
- antisolvent-solvent extraction
- grain growth
- nucleation
- solar cells
- wide-bandgap perovskite