scholarly journals Photoluminescence and Photoconductivity of Lead Halide Perovskite Films Modified with Mixed Cellulose Esters-=SUP=-1-=/SUP=-

2021 ◽  
Vol 91 (6) ◽  
pp. 985
Author(s):  
A.N. Aleshin ◽  
P.P. Shirinkin ◽  
A.K. Khripunov ◽  
N.N. Saprykina ◽  
I.P. Shcherbakov ◽  
...  
Keyword(s):  
Composite Films ◽  
Optical Excitation ◽  
Excitation Power ◽  
Solar Simulator ◽  
Cellulose Esters ◽  
Exciton Recombination ◽  
Halide Perovskite ◽  
Mixed Cellulose Esters ◽  
Lead Halide ◽  
Selection Of

We have investigated the photoluminescence (PL) and photoconductivity of lead halide perovskite (CH3NH3PbBr3) films modified with different mixed cellulose esters (CEs). It was shown that the absorbance and PL spectra of CH3NH3PbBr3 : CE films contain contributions of both the CH3NH3PbBr3 and CE with the dominant contribution to the PL from perovskite component. The dependences of the integral PL intensities of the CH3NH3PbBr3 : CE films on the optical excitation power turned out to be sublinear. This indicates that exciton recombination, as well as recombination via impurity levels, occur in CH3NH3PbBr3 : CE films at high excitation power levels. The conductivity of CH3NH3PbBr3 : CE films at 300 K increases up to ~90 times when illuminated by a solar simulator, and this effect is environmentally stable due to the formation of hydrogen bonds between CE and the lead halide perovskite CH3NH3PbBr3. It is expected that appropriate selection of CE and optimization of CE inclusion will improve the optoelectronic properties and stability of composite films based on lead halide perovskite-CE composites.

New Pigeonholing Approach for Selection of Solvents Relevant to Lead Halide Perovskite Processing

2020 ◽  
Vol 124 (20) ◽  
pp. 11117-11123 ◽  
Author(s):  
Andrei S. Tutantsev ◽  
Natalia N. Udalova ◽  
Sergey A. Fateev ◽  
Andrey A. Petrov ◽  
Wang Chengyuan ◽  
...  
Keyword(s):  
Halide Perovskite ◽  
Lead Halide ◽  
Selection Of

scholarly journals Modular Zwitterion-Functionalized Poly(Isopropyl Methacrylate) Polymers for Hosting Luminescent Lead-Halide Perovskite Nanocrystals

2021 ◽  
Author(s):  
Theodore A. Cohen ◽  
Yunping Huang ◽  
Nico A. Bricker ◽  
Connor S. Juhl ◽  
Tyler J. Milstein ◽  
...  
Keyword(s):  
Composite Films ◽  
Continuous Illumination ◽  
Quantum Yields ◽  
Green Solvents ◽  
Ambient Conditions ◽  
Perovskite Nanocrystals ◽  
Zwitterionic Polymers ◽  
Methacrylate Polymers ◽  
Halide Perovskite ◽  
Lead Halide

Inorganic lead-halide perovskite nanocrystals (NCs) are an exciting class of luminescent materials with high defect tolerance and broad spectral tunability, but such NCs are vulnerable to degradation under ambient conditions. Here, we report a class of modular zwitterion-functionalized isopropyl methacrylate polymers designed to stabilize a wide variety of perovskite NCs of different compositions, while also enabling processing in green solvents. Specifically, we report polymers in which the zwitterion spacing is tuned to accommodate the different lattice parameters of CsPb(Cl<sub>1-<i>x</i></sub>Br<i><sub>x</sub></i>)<sub>3</sub> and CsPbI<sub>3</sub> NCs, and we report partially fluorinated polymers prepared to accommodate the needs of infrared-emitting NCs. We show that as-synthesized CsPbBr<sub>3</sub>, CsPbI<sub>3</sub>, and Yb<sup>3+</sup>:CsPbCl<sub>3</sub> NCs are easily transferred into these zwitterionic polymers <i>via</i> a simple ligand-exchange procedure. These NC/polymer composites were then cast into thin films that showed substantially improved photoluminescence (PL) and stability compared with more conventional NC/polymer films. Specifically, CsPbBr<sub>3</sub> and CsPbI<sub>3</sub> NCs in films of their appropriately designed polymers had PL quantum yields of ~90% and ~80%, respectively. PL quantum yields decreased under continuous illumination, but self-healed completely after dark storage. We also found that all the NC compositions studied here maintain their PL quantum yields in NC/polymer composite films even after 1 year of ambient storage. These encouraging results demonstrate the utility of such modular zwitterion-functionalized polymers for hosting specific perovskite NCs, potentially opening avenues for robust new photonic applications of this important class of NCs.

scholarly journals Modular Zwitterion-Functionalized Poly(Isopropyl Methacrylate) Polymers for Hosting Luminescent Lead-Halide Perovskite Nanocrystals

2021 ◽  
Author(s):  
Theodore A. Cohen ◽  
Yunping Huang ◽  
Nico A. Bricker ◽  
Connor S. Juhl ◽  
Tyler J. Milstein ◽  
...  
Keyword(s):  
Composite Films ◽  
Continuous Illumination ◽  
Quantum Yields ◽  
Green Solvents ◽  
Ambient Conditions ◽  
Perovskite Nanocrystals ◽  
Zwitterionic Polymers ◽  
Methacrylate Polymers ◽  
Halide Perovskite ◽  
Lead Halide

Inorganic lead-halide perovskite nanocrystals (NCs) are an exciting class of luminescent materials with high defect tolerance and broad spectral tunability, but such NCs are vulnerable to degradation under ambient conditions. Here, we report a class of modular zwitterion-functionalized isopropyl methacrylate polymers designed to stabilize a wide variety of perovskite NCs of different compositions, while also enabling processing in green solvents. Specifically, we report polymers in which the zwitterion spacing is tuned to accommodate the different lattice parameters of CsPb(Cl<sub>1-<i>x</i></sub>Br<i><sub>x</sub></i>)<sub>3</sub> and CsPbI<sub>3</sub> NCs, and we report partially fluorinated polymers prepared to accommodate the needs of infrared-emitting NCs. We show that as-synthesized CsPbBr<sub>3</sub>, CsPbI<sub>3</sub>, and Yb<sup>3+</sup>:CsPbCl<sub>3</sub> NCs are easily transferred into these zwitterionic polymers <i>via</i> a simple ligand-exchange procedure. These NC/polymer composites were then cast into thin films that showed substantially improved photoluminescence (PL) and stability compared with more conventional NC/polymer films. Specifically, CsPbBr<sub>3</sub> and CsPbI<sub>3</sub> NCs in films of their appropriately designed polymers had PL quantum yields of ~90% and ~80%, respectively. PL quantum yields decreased under continuous illumination, but self-healed completely after dark storage. We also found that all the NC compositions studied here maintain their PL quantum yields in NC/polymer composite films even after 1 year of ambient storage. These encouraging results demonstrate the utility of such modular zwitterion-functionalized polymers for hosting specific perovskite NCs, potentially opening avenues for robust new photonic applications of this important class of NCs.

scholarly journals Терагерцевое поглощение в композитных пленках на основе металлоорганического перовскита и смешанного эфира целлюлозы

2020 ◽  
Vol 46 (10) ◽  
pp. 51
Author(s):  
А.В. Андрианов ◽  
А.Н. Алешин
Keyword(s):  
Composite Films ◽  
Low Frequency ◽  
Cellulose Ester ◽  
Terahertz Time Domain Spectroscopy ◽  
Absorption Bands ◽  
Cellulose Esters ◽  
Terahertz Region ◽  
The Stability ◽  
Thz Absorption ◽  
Mixed Cellulose Esters

Composites based on the organometallic perovskite CH3NH3PbI3 and mixed cellulose ester were studied by terahertz time-domain spectroscopy. It is shown that the introduction of mixed cellulose esters into the precursor of organometallic perovskite CH3NH3PbI3 significantly modifies the parameters of perovskite in the terahertz region and also improves the stability of such composite films. It is found that the addition of mixed cellulose ester to the perovskite film leads to a significant weakening of the THz absorption bands in the frequency range of the order of 1 and 2 THz, which are caused by the excitation of low-frequency vibrational modes in CH3NH3PbI3 perovskite molecules. This can be explained by the fact that cellulose ester molecules enveloping perovskite molecules dampen low-frequency vibrations in them.

scholarly journals Фотоэлектрические свойства композитных пленок на основе металлоорганического перовскита CH-=SUB=-3-=/SUB=-NH-=SUB=-3-=/SUB=-PbBr-=SUB=-3-=/SUB=- модифицированного смешанным эфиром целлюлозы

2021 ◽  
Vol 63 (1) ◽  
pp. 152
Author(s):  
Н.К. Исаев ◽  
А.Н. Алешин
Keyword(s):  
Composite Films ◽  
Perovskite Solar Cells ◽  
Cellulose Ester ◽  
Simulated Sunlight ◽  
Cellulose Esters ◽  
Light Emitting ◽  
Photoelectric Properties ◽  
The Stability ◽  
Mixed Cellulose Esters ◽  
Main Factor

It is shown that the introduction of a mixed cellulose esters with acetrimethyl acetate into films of organometallic perovskite CH3NH3PbBr3 significantly increases their stability while maintaining the optical and photoelectric properties of perovskite. It was found that with the introduction of 10-20 wt% mixed cellulose ester in CH3NH3PbBr3, the resistivity of the composite increases by 5-10 times within 60-70 days, while in pure perovskite films such changes are observed within 10-15 days. When the films are irradiated with a simulated sunlight, the resistance of the samples drops by 2-3 orders of magnitude, and the effect of photosensitivity persist for more than 2 months. The formation of hydrogen bonds between mixed cellulose ester and organometallic perovskite is, in our opinion, the main factor that increases the stability of the composite film in comparison with pure perovskite. The investigated composite films are promising for the design of degradation-resistant perovskite solar cells and light-emitting diodes.

A thiourea additive-based quadruple cation lead halide perovskite with an ultra-large grain size for efficient perovskite solar cells

Nanoscale ◽  
2019 ◽  
Vol 11 (45) ◽  
pp. 21824-21833 ◽  
Author(s):  
Jyoti V. Patil ◽  
Sawanta S. Mali ◽  
Chang Kook Hong
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Inorganic Perovskite ◽  
Halide Perovskite ◽  
Lead Halide

Controlling the grain size of the organic–inorganic perovskite thin films using thiourea additives now crossing 2 μm size with >20% power conversion efficiency.

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