TY - GEN
T1 - Interplay of Grain Size, Crystal Orientation, and Performance in Mixedion Lead Halide Perovskite Films
AU - Wieghold, Sarah
AU - Correa-Baena, Juan Pablo
AU - Nienhaus, Lea
AU - Sun, Shijing
AU - Tresback, Jason S.
AU - Liu, Zhe
AU - Shin, Seong Sik
AU - Bawendi, Moungi G.
AU - Buonassisi, Tonio
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/11/26
Y1 - 2018/11/26
N2 - Mixed-cation lead mixed-halide perovskite thinfilms are a promising alternative to methylammonium lead iodide due to higher long-term stability, photostability and bandgap tenability. However, the crystallinity of the absorber layer plays an important role for charge carrier collection as well as for an efficient transport between the different device layers. In this contribution, we investigate the influence of grain size by changing the molar concentration of the perovskite precursor containing Rb, Cs, MA, FA, Pb, I and Br on the charge carrier dynamics. We find that with increasing molar precursor concentration, the grain sizes increase and the perovskite grains become more oriented with an improved charge carrier lifetime. In particular, films with small grains show mostly random grain orientation angles, whereas films with larger grains are oriented with 100 planes around an angle of 20° relative to the surface normal. These findings may be the crucial factor in engineering high-quality films leading to high power conversion efficiencies.
AB - Mixed-cation lead mixed-halide perovskite thinfilms are a promising alternative to methylammonium lead iodide due to higher long-term stability, photostability and bandgap tenability. However, the crystallinity of the absorber layer plays an important role for charge carrier collection as well as for an efficient transport between the different device layers. In this contribution, we investigate the influence of grain size by changing the molar concentration of the perovskite precursor containing Rb, Cs, MA, FA, Pb, I and Br on the charge carrier dynamics. We find that with increasing molar precursor concentration, the grain sizes increase and the perovskite grains become more oriented with an improved charge carrier lifetime. In particular, films with small grains show mostly random grain orientation angles, whereas films with larger grains are oriented with 100 planes around an angle of 20° relative to the surface normal. These findings may be the crucial factor in engineering high-quality films leading to high power conversion efficiencies.
KW - atomic force microscopy
KW - crystal orientation
KW - grain size
KW - Mixed-ion perovskites
KW - pole figures
UR - https://www.scopus.com/pages/publications/85059914802
U2 - 10.1109/PVSC.2018.8547942
DO - 10.1109/PVSC.2018.8547942
M3 - Conference contribution
AN - SCOPUS:85059914802
T3 - 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC
SP - 2553
EP - 2556
BT - 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 7th IEEE World Conference on Photovoltaic Energy Conversion, WCPEC 2018
Y2 - 10 June 2018 through 15 June 2018
ER -