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

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.

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

Письма в журнал технической физики ◽

10.21883/pjtf.2020.10.49434.18269 ◽

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.

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

Журнал технической физики ◽

10.21883/jtf.2021.06.50869.16-20 ◽

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.

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Dopants for Enhanced Performance of Tin-Based Perovskite Solar Cells—A Short Review

Coatings ◽

10.3390/coatings11091045 ◽

2021 ◽

Vol 11 (9) ◽

pp. 1045

Author(s):

Hairui Liu ◽

Zuhong Zhang ◽

Feng Yang ◽

Jien Yang ◽

Andrews Nirmala Grace ◽

...

Keyword(s):

Solar Cells ◽

Perovskite Solar Cells ◽

Short Review ◽

Water Soluble ◽

Lead Free ◽

Silicon Solar Cells ◽

Photoelectric Properties ◽

General Chemical ◽

Alternative Material ◽

The Stability

Lead-based perovskite solar cells had reached a bottleneck and demonstrated significant power conversion efficiency (PCE) growth matching the performance of traditional polycrystalline silicon solar cells. Lead-containing perovskite solar cell technology is on the verge of commercialization and has huge potential to replace silicon solar cells, but despite the very promising future of these perovskite solar cells, the presence of water-soluble toxic lead content is a growing concern in the scientific community and a major bottleneck for their commercialization. The less toxic, tin-based perovskite solar cells are promising alternatives for lead-free perovskite solar cells. Like lead-based perovskite, the general chemical formula composition of tin-based perovskite is ASnX3, where A is a cation and X is an anion (halogen). It is evident that tin-based perovskites, being less-toxic with excellent photoelectric properties, show respectable performance. Recently, numerous studies reported on the fabrication of Sn-based perovskite solar cells. However, the stability of this novel lead-free alternative material remains a big concern. One of the many ways to stabilize these solar cells includes addition of dopants. In this context, this article summarizes the most important fabrication routes employing dopants that have shown excellent stability for tin-based perovskite photovoltaics and elaborates the prospects of lead-free, tin based stable perovskite photovoltaics.

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Study on Preparation and Stability of Perovskite Solar Cells with Supramolecular Interaction

E3S Web of Conferences ◽

10.1051/e3sconf/202018501065 ◽

2020 ◽

Vol 185 ◽

pp. 01065

Author(s):

Qing Zhu ◽

Chengsheng Li

Keyword(s):

Solar Cells ◽

Perovskite Solar Cells ◽

Optical Absorption Coefficient ◽

Photoelectric Conversion Efficiency ◽

Supramolecular Interaction ◽

Photoelectric Conversion ◽

Ion Migration ◽

Photoelectric Properties ◽

Perovskite Materials ◽

The Stability

In recent years, perovskite solar cells have been developed rapidly because of its excellent crystalline properties, high optical absorption coefficient, high carrier mobility, long carrier life and direct band gap, and suitable to be used as light absorbing layer material of photovoltaic devices. However, the most prominent problem of perovskite materials is that a lot of organic cations will migrate and lose in the process of illumination or heating, which is considered to be the main reason for the performance degradation of perovskite films and devices. Therefore, the suppression of ion migration in perovskite is helpful to improve the stability of perovskite materials and devices and enhance their photoelectric properties. In order to effectively control the ion migration in perovskite films, this paper uses the cation-π supramolecular interaction, to prepare the perovskite films with better photoelectric performance and higher stability. The experimental results show that the photoelectric conversion efficiency of the perovskite solar cellsdevice doped with rubrene is increased from 18.60% to 20.86%, and the hysteresis of the cell is also significantly suppressed.

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