Emission Properties and Ultrafast Carrier Dynamics of CsPbCl3 Perovskite Nanocrystals

Fluence-dependent photoluminescence and ultrafast transient absorption spectroscopy are used to study the dynamic behavior of carriers in CsPbCl3 perovskite nanocrystals. At low excitation fluences, the radiative recombination rate is outcompeted by significant trapping of the charge carriers which then recombine nonradiatively, resulting in weak photoluminescence. As fluence is increased, the saturation of trap states deactivates these nonradiative relaxation paths giving rise to an increase in photoluminescence at first. However, with further increases in fluence, Auger recombination of multiexcitons results in a decline in photoluminescence efficiency. Analysis of this behavior yields an absorption cross section at 400 nm (3.1 eV) of (0.24 ± 0.05) × 10–14 cm2. Transient photoluminescence and absorption measurements yielded values for single exciton trapping lifetime (1.6 ± 0.7 ns), biexciton and trion lifetimes (20 ± 3 and 157 ± 20 ps, respectively), single exciton radiative lifetime (12.7 ± 0.2 ns), i...

[1]  E. Alarousu,et al.  Giant Photoluminescence Enhancement in CsPbCl3 Perovskite Nanocrystals by Simultaneous Dual-Surface Passivation , 2018, ACS Energy Letters.

[2]  A. P. Alivisatos,et al.  Virtual Issue on Metal-Halide Perovskite Nanocrystals—A Bright Future for Optoelectronics , 2017 .

[3]  Matthew C. Beard,et al.  Enhanced mobility CsPbI3 quantum dot arrays for record-efficiency, high-voltage photovoltaic cells , 2017, Science Advances.

[4]  He Huang,et al.  Lead Halide Perovskite Nanocrystals in the Research Spotlight: Stability and Defect Tolerance , 2017, ACS energy letters.

[5]  Chennupati Jagadish,et al.  Large-Scale Statistics for Threshold Optimization of Optically Pumped Nanowire Lasers. , 2017, Nano letters.

[6]  Amelie Heuer-Jungemann,et al.  Giant Bandgap Renormalization and Exciton–Phonon Scattering in Perovskite Nanocrystals , 2017 .

[7]  Z. Yin,et al.  Ultra-bright and highly efficient inorganic based perovskite light-emitting diodes , 2017, Nature Communications.

[8]  Noah D Bronstein,et al.  Essentially Trap-Free CsPbBr3 Colloidal Nanocrystals by Postsynthetic Thiocyanate Surface Treatment. , 2017, Journal of the American Chemical Society.

[9]  H. Tahara,et al.  Dynamics of Charged Excitons and Biexcitons in CsPbBr3 Perovskite Nanocrystals Revealed by Femtosecond Transient-Absorption and Single-Dot Luminescence Spectroscopy. , 2017, The journal of physical chemistry letters.

[10]  N. Scrutton,et al.  Direct Evidence of an Excited-State Triplet Species upon Photoactivation of the Chlorophyll Precursor Protochlorophyllide. , 2017, The journal of physical chemistry letters.

[11]  Edward P. Booker,et al.  Photon Reabsorption in Mixed CsPbCl3:CsPbI3 Perovskite Nanocrystal Films for Light-Emitting Diodes , 2017, The journal of physical chemistry. C, Nanomaterials and interfaces.

[12]  E. Tjørve,et al.  Species–Area Relationship , 2017 .

[13]  O. Voznyy,et al.  Efficient Biexciton Interaction in Perovskite Quantum Dots Under Weak and Strong Confinement. , 2016, ACS nano.

[14]  Tien Khee Ng,et al.  Perovskite Nanocrystals as a Color Converter for Visible Light Communication , 2016 .

[15]  Oleksandr Isaienko,et al.  Spectral and Dynamical Properties of Single Excitons, Biexcitons, and Trions in Cesium-Lead-Halide Perovskite Quantum Dots. , 2016, Nano letters.

[16]  Taeghwan Hyeon,et al.  The surface science of nanocrystals. , 2016, Nature materials.

[17]  Zeger Hens,et al.  Highly Dynamic Ligand Binding and Light Absorption Coefficient of Cesium Lead Bromide Perovskite Nanocrystals. , 2016, ACS nano.

[18]  H. Zeng,et al.  Quantum Dot Light‐Emitting Diodes Based on Inorganic Perovskite Cesium Lead Halides (CsPbX3) , 2015, Advanced materials.

[19]  Shaojun Guo,et al.  Room Temperature Single-Photon Emission from Individual Perovskite Quantum Dots. , 2015, ACS nano.

[20]  Liberato Manna,et al.  Tuning the Optical Properties of Cesium Lead Halide Perovskite Nanocrystals by Anion Exchange Reactions , 2015, Journal of the American Chemical Society.

[21]  Christopher H. Hendon,et al.  Nanocrystals of Cesium Lead Halide Perovskites (CsPbX3, X = Cl, Br, and I): Novel Optoelectronic Materials Showing Bright Emission with Wide Color Gamut , 2015, Nano letters.

[22]  D. Binks,et al.  Effect of Chloride Passivation on Recombination Dynamics in CdTe Colloidal Quantum Dots , 2015, Chemphyschem : a European journal of chemical physics and physical chemistry.

[23]  V. Klimov Multicarrier Interactions in Semiconductor Nanocrystals in Relation to the Phenomena of Auger Recombination and Carrier Multiplication , 2014 .

[24]  V. Klimov Spectral and dynamical properties of multiexcitons in semiconductor nanocrystals. , 2007, Annual review of physical chemistry.

[25]  Song Jin,et al.  Continuous‐Wave Lasing in Cesium Lead Bromide Perovskite Nanowires , 2018 .