Manipulating Crystallization of Organolead Mixed-Halide Thin Films in Antisolvent Baths for Wide-Bandgap Perovskite Solar Cells

• DOI: 10.1021/acsami.5b10987
• Publication Date: 2016-01-04T16:38:48Z
• Authors: Yuanyuan Zhou; Mengjin Yang; Onkar S. Game; Wenwen Wu; Joonsuh Kwun; Martin A. Strauss; Yanfa Yan; Jinsong Huang; Kai Zhu; Nitin P. Padture
• Keywords: Solar cells; Wide-bandgap perovskite; Nucleation; 02 engineering and technology; 0210 nano-technology; 7. Clean energy; Antisolvent-solvent extraction; Grain growth

Wide-bandgap perovskite solar cells (PSCs) based on organolead (I, Br)-mixed halide perovskites (e.g., MAPbI2Br and MAPbIBr2 with bandgaps of 1.77 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 antisolvent bath is critical formation smooth, dense thin films these perovskites. Since growth grains from a precursor solution tends to be more rapid increasing Br content, further enhancement nucleation rate becomes necessary effective decoupling crystal-growth stages Br-rich This enabled by introducing simple stirring during antisolvent-bathing, which induces enhanced advection transport extracted precursor-solvent into environment. Consequently, wide-bandgap planar PSCs fabricated using high quality mixed-halide films, MAPbIBr2, particular, show PV performance.