Browsing by Author "Buyukcelebi, Sumeyra"

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Citation - WoS: 2
Citation - Scopus: 2
Polyoxometalate-Doped Hole Transport Layer To Boost Performance of Mapbi3-Based Inverted-Type Perovskite Solar Cells
(Amer Chemical Soc, 2025) Buyukcelebi, Sumeyra; Kazici, Mehmet; Torlak, Yasemin; Kus, Mahmut; Ersoz, Mustafa
This study delves into the examination of the efficiency, stability, and repeatability of perovskite solar cells (PSCs), a focal point in contemporary photovoltaic (PV) technologies. The aim is to address the challenges encountered in PSCs. To achieve this goal, Ge-doped polyoxometalate, a structure of significance in recent molecular electronics, was employed as a dopant in the hole transport layer (HTL). The study investigated alterations in the conductivity, improvements in efficiency, and changes in PV parameters. The utilization of PEDOT/PSS doped with a maximum of 2% GePOM resulted in an average efficiency increase of 27% in PSCs compared with the reference. Moreover, enhancements in stability and repeatability were also noted. Comparatively, the reference PSC operated at an efficiency of 11.18%, while PSCs incorporating 2% GePOM into PEDOT/PSS as the HTL exhibited a notable increase in the efficiency, reaching 14.22%. Furthermore, the champion device exhibited an observed fill factor value of 0.74, a short-circuit current density (J sc) value of 19.78 mA/cm2, and an open-circuit voltage (V oc) value of 0.98 V. Consequently, noteworthy enhancements have been noticed in the PV parameters of PSCs with the introduction of GePOM doping.
Citation - WoS: 5
Citation - Scopus: 6
Self-Powered Narrowband Near-Infrared Photodetector Based on Polyoxometalate Compound
(Elsevier, 2025) Hussaini, Ali Akbar; Torlak, Yasemin; Buyukcelebi, Sumeyra; Kus, Mahmut; Yildirim, Murat
Narrowband photodetectors are employed in optical communication, where designated wavelengths are used to transmit data, and in environmental sensing to identify specific gases that absorb distinct wavelengths of light. In this study, we developed a novel polyoxometalate compound for application as a near-infrared (NIR) photodetector. Li6 [alpha-P2W18O62]-.28H2O compound was synthesized successfully and was characterized using 31P NMR, FT-IR, UV-Vis, C-V, SEM, TEM, and AFM. We used Li6 [alpha-P2W18O62]-.28H2O compound as interlayer in Schottky type photodetector structure. Photodiode and photodetector measurements were performed under various solar intensities (20, 40, 60, 80, and 100 mW), ultraviolet, visible, and near-infrared wavelengths ranging from 351 to 1600 nm. Notably, the device exhibited an excellent responsivity, external quantum efficiency, and detectivity under near-infrared wavelengths. It showed 64.17 mA/W responsivity, 4.34 x 1010 Jones detectivity and 7.96 % external quantum efficiency at 1000 nm and 0 bias voltage. Moreover, the device demonstrated 4.736 A/W responsivity and 8.57 x 1011 Jones detectivity under solar light. Furthermore, this research introduces a novel compound for developing narrowband photodetectors utilizing polyoxometalate.