Enhancing the performance of perovskite solar cells (PSCs) is one of the
prime concerns of researchers worldwide. For PSC devices, it is
essential to develop the individual layer efficiently and
cost-effectively. This work emphasizes the possibility of employing
Zn-Sn oxide-based composite materials as an alternative electron
transport layer (ETL) in PSC devices. Pristine Zn SnO
(ZTO), composite ZTO-ZnO, and ZTO-SnO
heterostructure-based ETL were prepared by simple
solid-state calcination technique and proposed as an alternative for the
TiO photoanode used in the PSC devices. The power
conversion efficiency of the designed PSC was studied based on
crystallinity, morphology, cross-section, roughness, contact angle, work
function, and Raman analysis of the ETL material. TEM analysis confirms
the phase pure ZTO and heterostructure formation as a function of
material stoichiometry. Compared to the pristine ZTO, the ZTO-ZnO and
ZTO-SnO composites have an enhanced PSC performance.
The ZTO-SnO composites exhibit better band matching
and charge transfer behavior with the perovskite layer than the pristine
ZTO and ZTO-ZnO composites. ZTO-SnO ETL-based PSC
device displays a maximum efficiency of 15.6 %, while ZTO-ZnO shows a
maximum efficiency of 13.1 %, which is more than 10.5 % for the
pristine ZTO. The results indicate that Zn SnO
-based composites can be suitable for ETL in PSC device
fabrication.
Ce3+/ Li+ activated barium aluminate phosphor (BAO) was synthesized by conventional solid-state reaction method. The crystal structure of the synthesized phosphor was analyzed by X-ray diffraction (XRD) and Raman spectroscopy analysis. FT-IR spectrum results revealed the characteristic vibration bands present in the synthesized phosphor. Surface composition analysis of the prepared samples was examined using X-ray photoelectron spectroscopy (XPS). PL emission band observed at 589 nm was assigned to 5D excited level corresponding to 2F5/2 transition in yellow region under the excitation wavelength of 320 nm. Yellow light emission was confirmed by the Commission Internationale de L’Eclairage (CIE) chromatic coordinate graph. The color purity of BAO: 0.5Ce3+, BAO: 0.5Ce3+, 0.1Li+ was found to be 78.4 %, 81.3 % whereas the measured lifetime was 4.333, 4.738 ns respectively.
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