TY - JOUR
T1 - Excess Cesium Iodide Induces Spinodal Decomposition of CsPbI 2 Br Perovskite Films
AU - Meng, Xiangyue
AU - Wang, Zheng
AU - Qian, Wei
AU - Zhu, Zonglong
AU - Zhang, Teng
AU - Bai, Yang
AU - Hu, Chen
AU - Xiao, Shuang
AU - Yang, Yinglong
AU - Yang, Shihe
N1 - Publisher Copyright:
© 2018 American Chemical Society.
PY - 2019/1/17
Y1 - 2019/1/17
N2 - We report an exploratory study on the crystal formation behavior of CsPbI 2 Br perovskite films by adding excess cesium iodide (CsI). Surprisingly, facile co-crystallization of CsI and CsPbI 2 Br in the form of spinodal decomposition is observed. Significantly, the two phases spontaneously form morphing into a remarkably uniform bicontinuous nanoscale blend with high orientational correlation through the well-matched (110) plane of CsI and the (200) plane of CsPbI 2 Br. The CsPbI 2 Br films produced by the spinodal decomposition method not only enjoy a compact surface, low defect concentration, and long carrier lifetimes, they also retain their excellent charge transport property. By employing such a CsPbI 2 Br film for carbon-based perovskite solar cells, power conversion efficiency exceeding 10% is achieved with remarkable thermal stability. Our results provide valuable insight into the role of CsI in perovskite crystallization and a promising approach for designing inorganic halide perovskite-based devices.
AB - We report an exploratory study on the crystal formation behavior of CsPbI 2 Br perovskite films by adding excess cesium iodide (CsI). Surprisingly, facile co-crystallization of CsI and CsPbI 2 Br in the form of spinodal decomposition is observed. Significantly, the two phases spontaneously form morphing into a remarkably uniform bicontinuous nanoscale blend with high orientational correlation through the well-matched (110) plane of CsI and the (200) plane of CsPbI 2 Br. The CsPbI 2 Br films produced by the spinodal decomposition method not only enjoy a compact surface, low defect concentration, and long carrier lifetimes, they also retain their excellent charge transport property. By employing such a CsPbI 2 Br film for carbon-based perovskite solar cells, power conversion efficiency exceeding 10% is achieved with remarkable thermal stability. Our results provide valuable insight into the role of CsI in perovskite crystallization and a promising approach for designing inorganic halide perovskite-based devices.
UR - http://www.scopus.com/inward/record.url?scp=85060165435&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.8b03742
DO - 10.1021/acs.jpclett.8b03742
M3 - Article
C2 - 30596242
AN - SCOPUS:85060165435
SN - 1948-7185
VL - 10
SP - 194
EP - 199
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 2
ER -