Improved morphology, structure and optical properties of CH3NH3PbI3 film via HQ additive in PbI2 precursor solution for efficient and stable mesoporous perovskite solar cells

Bioki, Hojjat Amrollahi; Moshaii, Ahmad; Zarandi, Mahmood Borhani

doi:10.1016/j.synthmet.2021.116965

Cited by 8 publications

(4 citation statements)

References 36 publications

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“…Recent studies established that larger grains and a smoother surface of the perovskite directly improve not only photovoltaics performance but also the stability of PSCs. [ 68–71 ] Furthermore, the different growth and quality of the Au electrode and thin electron transport layers in laminated PSCs could also play a role, as previously reported. [ 72 ] These layers are thermally evaporated on the smooth PEN foil and not directly onto the perovskite (as in the standard method).…”

Section: Resultsmentioning

confidence: 73%

Laminated Monolithic Perovskite/Silicon Tandem Photovoltaics

Roger

Schorn

Heydarian

et al. 2022

Advanced Energy Materials

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Perovskite/silicon tandem photovoltaics have attracted enormous attention in science and technology over recent years. In order to improve the performance and stability of the technology, new materials and processes need to be investigated. However, the established sequential layer deposition methods severely limit the choice of materials and accessible device architectures. In response, a novel lamination process that increases the degree of freedom in processing the top perovskite solar cell (PSC) is proposed. The very first prototypes of laminated monolithic perovskite/silicon tandem solar cells with stable power output efficiencies of up to 20.0% are presented. Moreover, laminated single‐junction PSCs are on par with standard sequential layer deposition processed devices in the same architecture. The numerous advantages of the lamination process are highlighted, in particular the opportunities to engineer the perovskite morphology, which leads to a reduction of non‐radiative recombination losses and and an enhancement in open‐circuit voltage (Voc). Laminated PSCs exhibit improved stability by retaining their initial efficiency after 1‐year aging and show good thermal stability under prolonged illumination at 80 °C. This lamination approach enables the research of new architectures for perovskite‐based photovoltaics and paves a new route for processing monolithic tandem solar cells even with a scalable lamination process.

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Section: Resultsmentioning

confidence: 73%

Laminated Monolithic Perovskite/Silicon Tandem Photovoltaics

Roger

Schorn

Heydarian

et al. 2022

Advanced Energy Materials

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“…Figure 1 shows the vibrational spectra employed for identifying the evolution of the chemical structure using characteristic transmission bands recorded at a high signal-to-noise ratio and in the wavenumber range of 400–4200 1/cm from a ~700 nm thick CH 3 NH 3 PbI 3-x Cl x sample before and after the sample degradation. Based on the published data [ 80 , 83 , 85 , 86 , 92 , 93 , 95 , 96 , 97 , 98 , 99 , 100 ], a good convergence of the vibrational spectra was observed when compared with the experimentally obtained vibrational spectra (red line) of a freshly obtained (new) sample. In a freshly produced thin perovskite film, the most intense vibrational mode was observed at the frequencies of 3132 1/cm and 3179 1/cm, which corresponded to the symmetric and asymmetric N-H stretching modes (associated with NH 3 + ).…”

Section: Resultsmentioning

confidence: 83%

IR Spectroscopic Degradation Study of Thin Organometal Halide Perovskite Films

et al. 2023

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The advantages of IR spectroscopy include relatively fast analysis and sensitivity, which facilitate its wide application in the pharmaceutical, chemical and polymer sectors. Thus, IR spectroscopy provides an excellent opportunity to monitor the degradation and concomitant evolution of the molecular structure within a perovskite layer. As is well-known, one of the main limitations preventing the industrialization of perovskite solar cells is the relatively low resistance to various degradation factors. The aim of this work was to study the degradation of the surface of a perovskite thin film CH3NH3PbI3-xClx caused by atmosphere and light. To study the surface of CH3NH3PbI3-xClx, a scanning electron microscope, infrared (IR) spectroscopy and optical absorption were used. It is shown that the degradation of the functional layer of perovskite proceeds differently depending on the acting factor present in the surrounding atmosphere, whilst the chemical bonds are maintained within the perovskite crystal structure under nitrogen. However, when exposed to an ambient atmosphere, an expansion of the NH3+ band is observed, which is accompanied by a shift in the N–H stretching mode toward higher frequencies; this can be explained by the degradation of the perovskite surface due to hydration. This paper shows that the dissociation of H2O molecules under the influence of sunlight can adversely affect the efficiency and stability of the absorbing layer. This work presents an approach to the study of perovskite structural stability with the aim of developing alternative concepts to the fabrication of stable and sustainable perovskite solar cells.

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“…According to figure 7(b), the application of compressive strain caused the absorption spectra to blue shift, which made two absorption peaks appear in the visible region. Additionally, the absorption coefficient rises steadily as compressive strain increases, and when strain surpasses −3%, the major absorption peak rises to over 2 × 10 5 cm −1 , which is significantly higher than that of halide perovskites [85].…”

Section: Optical Propertiesmentioning

confidence: 92%

First-principles study on the electronic structure and photocatalytic properties of novel two-dimensional Janus CrXCN₄ (X = Si, Ge)

Huang,

Lang,

Wang

et al. 2024

J. Phys. D: Appl. Phys.

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Abundant studies demonstrate the significant role of Janus-structured two dimensional semiconductors as photocatalytic materials, highlighting their substantial advantages and importance in photocatalysis. In this work, CrXCN4(X = Si, Ge) Janus monolayers were constructed based on CrC2N4, and the thermal stability, thermodynamic stability, mechanical stability, electronic properties, and optical properties of the monolayers were systematically investigated. Furthermore, an investigation was conducted to examine the impact of biaxial strain on their electrical and light absorption properties. The findings reveal that both monolayers exhibit direct band gap characteristics, with high absorption coefficients for visible light owing to their appropriate band gaps (1.44 eV for CrSiCN4 and 1.15 eV for CrGeCN4, respectively). At compressive strains exceeding 3%, the CrSiCN4monolayer demonstrates an optimal band edge position, suggesting its potential as a photocatalyst for overall water splitting. Furthermore, as the compressive strain increases, the absorption spectra have blue-shifted and the absorption coefficient becomes higher, exceeding 2×105/cm under a -3% compressive strain. Our study highlights the potential applications of CrXCN4monolayers in the field of optoelectronic device, particularly emphasizing the promising candidacy of CrSiCN4 as an efficient photocatalyst.

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Improved morphology, structure and optical properties of CH3NH3PbI3 film via HQ additive in PbI2 precursor solution for efficient and stable mesoporous perovskite solar cells

Cited by 8 publications

References 36 publications

Laminated Monolithic Perovskite/Silicon Tandem Photovoltaics

Laminated Monolithic Perovskite/Silicon Tandem Photovoltaics

IR Spectroscopic Degradation Study of Thin Organometal Halide Perovskite Films

First-principles study on the electronic structure and photocatalytic properties of novel two-dimensional Janus CrXCN₄ (X = Si, Ge)

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Improved morphology, structure and optical properties of CH3NH3PbI3 film via HQ additive in PbI2 precursor solution for efficient and stable mesoporous perovskite solar cells

Cited by 8 publications

References 36 publications

Laminated Monolithic Perovskite/Silicon Tandem Photovoltaics

Laminated Monolithic Perovskite/Silicon Tandem Photovoltaics

IR Spectroscopic Degradation Study of Thin Organometal Halide Perovskite Films

First-principles study on the electronic structure and photocatalytic properties of novel two-dimensional Janus CrXCN4 (X = Si, Ge)

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First-principles study on the electronic structure and photocatalytic properties of novel two-dimensional Janus CrXCN₄ (X = Si, Ge)