Journal
NANO ENERGY
Volume 73, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104803
Keywords
Inorganic halide perovskite; CsPbI2Br; GIWAXS; Lattice strain
Categories
Funding
- National Basic Research Program of China
- Fundamental Studies of Perovskite Solar Cells [2015CB932200]
- Natural Science Foundation of China [51602149, 61705102, 51972172, 91733302]
- Young 1000 Talents Global Recruitment Program of China
- Jiangsu Specially-Appointed Professor program, Six talent peaks Project in Jiangsu Province, China
- Nanjing Tech University
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The phase control and ordered crystal growth play a crucial role in the efficiency and stability of all-inorganic perovskite solar cells (PSCs). However, the innate dynamics of crystal growth driving the stable phase and high performance are unknown. Here, we for the first time unraveled that the degree of lattice strain is responsible for the suppression of the delta phase growth by in situ Grazing-Incidence Wide-Angle X-ray Scattering (GIWAXS) technique. We shadow the internal crystal structural changes in real time and successfully decoupled crystal growth dynamics under different substrate temperatures. The symmetrical crystal lattice and vertical substrate growth were finally achieved. This finding provides insights on the inorganic perovskite crystal growth and has significant benefit for high performing all-inorganic PSCs.
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