Journal
NANO LETTERS
Volume 16, Issue 8, Pages 4838-4848Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01168
Keywords
CsPbBr3 perovskite nanocrystals; quantum dots; time-resolved THz; ultrafast carrier dynamics; density functional theory; phonon; carrier mobility
Categories
Funding
- IISER-Pune
- DST-Nano Mission, Government of India [SR/NM/NS-1474/2014]
- Science and Engineering Research Board (SERB) [SR/S2/RJN-61/2012]
- DST-Nanomission Projects [SR/NM/NS-5/2011, SR/NM/NS-1285/2014(G)]
- UGC, India
- CSIR India
Ask authors/readers for more resources
Colloidal CsPbBr3 perovskite nanocrystals (NCs) have emerged as an excellent light emitting material in last one year. Using time domain and time-resolved THz spectroscopy and density functional theory based calculations, we establish 3-fold free carrier recombination mechanism, namely, nonradiative Auger, bimolecular electron hole recombination, and inefficient trap-assisted recombination in 11 nm sized colloidal CsPbBr3 NCs. Our results confirm a negligible influence of surface defects in trapping charge carriers, which in turn results into desirable intrinsic transport properties, from the perspective of device applications, such as remarkably high carrier mobility (similar to 4500 cm(2) V-1 s(-1)), large diffusion length (>9.2 mu m), and high luminescence quantum yield (80%). Despite being solution processed and possessing a large surface to volume ratio, this combination of high carrier mobility and diffusion length, along with nearly ideal photoluminescence quantum yield, is unique compared to any other colloidal quantum dot system.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available