TY - JOUR
T1 - Ultralong Radiative States in Hybrid Perovskite Crystals
T2 - Compositions for Submillimeter Diffusion Lengths
AU - Alarousu, Erkki
AU - El-Zohry, Ahmed M.
AU - Yin, Jun
AU - Zhumekenov, Ayan A.
AU - Yang, Chen
AU - Alhabshi, Esra
AU - Gereige, Issam
AU - Alsaggaf, Ahmed
AU - Malko, Anton V.
AU - Bakr, Osman M.
AU - Mohammed, Omar F.
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/9/21
Y1 - 2017/9/21
N2 - Organic-inorganic hybrid perovskite materials have recently evolved into the leading candidate solution-processed semiconductor for solar cells due to their combination of desirable optical and charge transport properties. Chief among these properties is the long carrier diffusion length, which is essential to optimizing the device architecture and performance. Herein, we used time-resolved photoluminescence (at low excitation fluence, 10.59 μJ·cm-2 upon two-photon excitation), which is the most accurate and direct approach to measure the radiative charge carrier lifetime and diffusion lengths. Lifetimes of about 72 and 4.3 μs for FAPbBr3 and FAPbI3 perovskite single crystals have been recorded, presenting the longest radiative carrier lifetimes reported to date for perovskite materials. Subsequently, carrier diffusion lengths of 107.2 and 19.7 μm are obtained. In addition, we demonstrate the key role of the organic cation units in modulating the carrier lifetime and its diffusion lengths, in which the defect formation energies for FA cations are much higher than those with the MA ones.
AB - Organic-inorganic hybrid perovskite materials have recently evolved into the leading candidate solution-processed semiconductor for solar cells due to their combination of desirable optical and charge transport properties. Chief among these properties is the long carrier diffusion length, which is essential to optimizing the device architecture and performance. Herein, we used time-resolved photoluminescence (at low excitation fluence, 10.59 μJ·cm-2 upon two-photon excitation), which is the most accurate and direct approach to measure the radiative charge carrier lifetime and diffusion lengths. Lifetimes of about 72 and 4.3 μs for FAPbBr3 and FAPbI3 perovskite single crystals have been recorded, presenting the longest radiative carrier lifetimes reported to date for perovskite materials. Subsequently, carrier diffusion lengths of 107.2 and 19.7 μm are obtained. In addition, we demonstrate the key role of the organic cation units in modulating the carrier lifetime and its diffusion lengths, in which the defect formation energies for FA cations are much higher than those with the MA ones.
UR - http://www.scopus.com/inward/record.url?scp=85029739893&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.7b01922
DO - 10.1021/acs.jpclett.7b01922
M3 - Article
C2 - 28849938
AN - SCOPUS:85029739893
SN - 1948-7185
VL - 8
SP - 4386
EP - 4390
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 18
ER -
