期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 37, 页码 31586-31593出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b06931
关键词
perovskite nanoplatelet; surface recombination; time-resolved photoluminescence; charge-carrier recombination; modeling
资金
- Australian Research Council [DP150104327, DP150102972, DP160102955]
- MCATM
- Australian Research Council (ARC) Centre of Excellence in Future Low-Energy Electronics Technologies (FLEET)
Halide perovskites are an extremely promising material platform for solar cells and photonic devices. The role of surface carrier recombination-well known to detrimentally affect the performance of devices-is still not well understood for thin samples where the thickness is comparable to or less than the carrier diffusion length. Here, using time-resolved microspectroscopy along with modeling, we investigate charge carrier recombination dynamics in halide perovskite CH3NH3PbI3 nanoplatelets with thicknesses from similar to 20 to 200 nm, ranging from much lesser than to comparable to the carrier diffusion length. We show that surface recombination plays a stronger role in thin perovskite nanoplatelets, significantly decreasing photoluminescence (PL) efficiency, PL decay lifetime, and photostability. Interestingly, we find that both thick and thin nanoplatelets exhibit a similar increase in PL efficiency with increasing excitation fluence, well described by our excitation saturation model. We also find that the excited carrier distribution along the depth impacts the surface recombination. Using the diffusion-surface recombination model, we determine the surface recombination velocity. This work provides a comprehensive understanding of the role of surface recombination and charge-carrier dynamics in thin perovskite platelets and reveals valuable insights useful for applications in photovoltaics and photonics.
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