Bandgap reduction in rGO-doped CsTiBr3 perovskite nanorods by solvothermal method

Beegum, K. A. Benazeera; Thomas, Christeena; Sasi, Saranya; Mathew, Alex; Reshmi, R.

doi:10.1007/s10854-023-10869-x

Cited by 1 publication

(2 citation statements)

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“…According to the I–V diagrams depicted in Figure c, the incorporation of GO resulted in a notable enhancement of the device conductivity by 27%. Furthermore, the activation energies of pristine devices and devices based on GO or rGO can be calculated using Arrhenius equation: ln 0.25em σ = − E α k T + ln 0.25em α 0 where σ is resistivity at temperature T , E α is activation energy, k is the Boltzmann constant, and α 0 is the resistivity at temperature 0 K. The activation energy values of the pristine SnO 2 , rGO-based SnO 2, and GO-based SnO 2 obtained from the slopes of the ln α vs. 1/ T curve are 2.85, 2.35, and 2.13 kJ mol –1 , respectively. The decrease in activation energy can be achieved by increasing the device conductivity, improving response times, lowering the operating voltage, and enhancing overall device performance.…”

Section: Resultsmentioning

confidence: 99%

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Enhancing Efficiency and Stability in Carbon-Based Perovskite Solar Cells by Double Passivation with Ultralow-Cost Coal-Derived Graphene and Its Derivatives

Zhao,

Hu,

Cao

et al. 2024

ACS Appl. Mater. Interfaces

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Coal-derived carbon nanomaterials possess numerous superior features compared to other classic carbon, such as readily accessible surfaces, tunable pore structure, and facile and precise surface functionalization. Therefore, the controllable preparation of coal-derived carbon nanomaterials is anticipated to be of great significance for the performance improvement and commercialization process of carbon-based perovskite solar cells (C-PSCs). In this study, we successfully synthesized highly stable and commercially valuable graphene oxide (GO) and reduced graphene oxide (rGO) utilizing coal. Compared to traditional methods and commercial graphene, the chemical oxidation and pyrolysis process used in this study is mild and simple, offering the advantages of controlled composition and the absence of other impurities. GO or rGO was incorporated into the top of the SnO 2 electron transport layer (ETL) of C-PSCs. Under optimized conditions and ultraviolet-ozone (UVO) irradiation, the ultimate power conversion efficiency (PCE) increased from the unmodified 12.4 to 14.04% (based on rGO) and 15.18% (based on GO), representing improvements of 22 and 31%, respectively. The improved photovoltaic performance is mainly owing to enhanced charge transport capabilities, denser interfacial contacts, improved carrier separation properties, increased conductivity, and abundance of hydrophilic functional groups in GO, which can form more stable hydrogen bonds with SnO 2 . After being stored at room temperature and ambient humidity for 30 days, the modified, unpacked devices retained 87% of the highest power conversion efficiency (PCE). This study introduces a practical and manageable method to enhance the performance of C-PSCs by using functional carbon nanomaterials derived from coal.

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Section: Resultsmentioning

confidence: 99%

“…32 Furthermore, as shown in Figure 4f According to the I−V diagrams depicted in Figure 5c, the incorporation of GO resulted in a notable enhancement of the device conductivity by 27%. Furthermore, the activation energies of pristine devices and devices based on GO or rGO can be calculated using Arrhenius equation: 33 = + E kT ln ln 0…”

Section: Resultsmentioning

confidence: 99%