Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 3, Pages 2232-2237Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b10987
Keywords
antisolvent-solvent extraction; nucleation; grain growth; solar cells; wide-bandgap perovskite
Funding
- National Science Foundation [DMR-1305913, OIA-1538893]
- U.S. Department of Energy [DE-AC36-08-GO28308]
- U.S. Department of Energy (DOE) SunShot Initiative [DE-FOA-0000990]
- Office of Integrative Activities
- Office Of The Director [1538893] Funding Source: National Science Foundation
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Wide..bandgap perovskite solar cells (PSCs) based on organolead (I, Br) mixed halide perovskites (e.g., MAPbI(2)Br and MAPbIBr(2) 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 MAPbIBr(2), in particular, show enhanced PV performance.
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