TY - JOUR
T1 - Secondary Phase Particles in Cesium Lead Bromide Perovskite Crystals
T2 - An Insight into the Formation of Matrix-Controlled Inclusion
AU - Cheng, Yuanbo
AU - Sun, Qihao
AU - Zhang, Peng
AU - Wang, Fangbao
AU - Zhang, Binbin
AU - Zhang, Guodong
AU - Jie, Wanqi
AU - Xu, Yadong
N1 - Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020/7/16
Y1 - 2020/7/16
N2 - The metal halide perovskite CsPbBr3 bulk crystals present electrical and optical performance discrepancy since the grown-in defects. Here, we first report the well-defined secondary phase (SP) particles of CsPb2Br5 with polyhedral morphology in CsPbBr3 crystals grown by the vertical Bridgman method. The resulting polyhedral morphology of CsPb2Br5 particles associated with the trapping of PbBr2-rich droplets have been discussed on the basis of the "matrix-controlled"growth. Two morphological evolution paths are proposed, which result in a regular cube SP particle comprised by {100} facets for the final equilibrium. Furthermore, the wafer with superior optical transmittance exhibits a higher photoelectric response on-off ratio (∼2000) in contrast to ∼80 for the wafer with high density SP particles. The corresponding hole mobility (μh) is calculated with the values 289.99 and 26.91 cm-2·V-1·s-1, respectively. The variation of μh is attributed to the carrier transport trajectory affected by SP induced trapping defects and the weak combination.
AB - The metal halide perovskite CsPbBr3 bulk crystals present electrical and optical performance discrepancy since the grown-in defects. Here, we first report the well-defined secondary phase (SP) particles of CsPb2Br5 with polyhedral morphology in CsPbBr3 crystals grown by the vertical Bridgman method. The resulting polyhedral morphology of CsPb2Br5 particles associated with the trapping of PbBr2-rich droplets have been discussed on the basis of the "matrix-controlled"growth. Two morphological evolution paths are proposed, which result in a regular cube SP particle comprised by {100} facets for the final equilibrium. Furthermore, the wafer with superior optical transmittance exhibits a higher photoelectric response on-off ratio (∼2000) in contrast to ∼80 for the wafer with high density SP particles. The corresponding hole mobility (μh) is calculated with the values 289.99 and 26.91 cm-2·V-1·s-1, respectively. The variation of μh is attributed to the carrier transport trajectory affected by SP induced trapping defects and the weak combination.
UR - http://www.scopus.com/inward/record.url?scp=85088233313&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.0c01561
DO - 10.1021/acs.jpclett.0c01561
M3 - 文章
C2 - 32584580
AN - SCOPUS:85088233313
SN - 1948-7185
VL - 11
SP - 5625
EP - 5631
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 14
ER -