Browsing by Author "Büyükbekar, Alihan"

Now showing 1 - 4 of 4

Citation - WoS: 10
Citation - Scopus: 12
Effect of Different Terminal Groups of Phenyl Boronic Acid Self-Assembled Monolayers on the Photovoltaic Performance of Organic Solar Cells
(ELSEVIER, 2021) Kırbıyık Kurukavak, Çisem; Yılmaz, Tuğbahan; Büyükbekar, Alihan; Kuş, Mahmut
Here, a new series of phenyl boronic acid derivative self-assembled monolayers (SAMs) with various functional groups terminated was presented as modification layer for the high performance P3HT:PCBM based organic solar cells (OSCs) with the configuration of ITO/SAM/PEDOT:PSS/P3HT:PCBM/LiF:Al. The photovoltaic device parameters of non-modified and modified ITO surfaces were compared. The electrical and morphologic characteristics of non-modified and modified ITO surfaces were determined by different techniques. It was obtained that the device performances were improved by using all boronic acid derivatives SAM molecules. The best performance of OSC was observed for NO2-PBA SAM modified device, which yielded a power conversion efficiency of 3.17%. Thanks to improved charge transport properties, serial resistance reduced, whereas shunt resistance improved after boronic acid SAMs modification. As a result, it could be said that the using of these SAMs as novel molecules for interfacial modification is an efficient way to improve the device performance of OSCs.
Citation - WoS: 15
Citation - Scopus: 17
Improved Performance With Boron-Doped Carbon Quantum Dots in Perovskite Solar Cells
(Elsevier Ltd, 2022) Kırbıyık Kurukavak, Çisem; Yılmaz, Tuğbahan; Toprak, Ayşegül; Büyükbekar, Alihan; Kuş, Mahmut; Ersöz, Mustafa
This study reports the using of boron-doped carbon quantum dots (B-CQDs), which can convert ultraviolet to blue light, as an additive in MAPbI3 based perovskite solar cells (PSCs) for improved photovoltaic performance. After a successful facile synthesis of B-CQDs, our work showed that the appropriate addition of B-CQDs (5% vol.) into MAPbI3 absorber layer can passivate the grain boundaries of perovskite crystals, improve the crystallinity and the grain sizes. Additionally, optical, and photovoltaic characteristics showed that the addition of B-CQDs can efficiently improve the charge transport properties and the hole extraction, while decreasing the recombination losses. In comparison to control device, power conversion efficiency (PCE) of champion device was increased from 10.4% to 12.7%. This approach of constructing inverted p-i-n PSCs with B-CQDs additives offers a simple way for the preparation of efficient and stable perovskite photovoltaics for future application. © 2022 Elsevier B.V.
Citation - WoS: 18
Citation - Scopus: 19
Phosphorus Doped Carbon Dots Additive Improves the Performance of Perovskite Solar Cells Via Defect Passivation in Mapbi3 Films
(Elsevier, 2023) Kırbıyık Kurukavak, Çisem; Yılmaz, Tuğbahan; Büyükbekar, Alihan; Tok, Mutahire; Kuş, Mahmut
Perovskites have been widely investigated as absorber layer in photovoltaic technology owing to their excellent properties. For further enhancement of the power conversion efficiencies (PCEs) of MAPbI3 perovskite solar cells, here, we successfully synthesized phosphorus doped carbon dots (P-CQDs) by solvothermal method and inves-tigated their effect as an additive on the perovskite film properties and photovoltaic performance. The results showed that electron-rich phosphorus can act as an excellent core unit in perovskite absorber layer to passivate defects at the surface for improved the crystallization and charge transport properties. Thanks to passivation effect of P-CQDs on perovskite films, as well as the suitable energy band gap values and optical properties of MAPbI3 layer, the device prepared with the addition of 5 vol% of P-CQDs achieved a champion PCE of 13.12% with a high fill factor (FF) of 73.44%, higher than the PCE of 10.71% with a FF of 58.81% for control device.
Citation - WoS: 6
Citation - Scopus: 7
Surface Modification of C-Tio2 Via Different Phenyl Boronic Acid Sams for Improved Performance of Inverted Organic Solar Cells
(ELSEVIER SCI LTD, 2021) Kırbıyık Kurukavak, Çisem; Yılmaz, Tuğbahan; Büyükbekar, Alihan; Kuş, Mahmut
In this study, phenyl boronic acid (PBA) self-assembled monolayers (SAMs) with different terminal groups were introduced on c-TiO2, as interfacial modification layer in organic solar cells (OSCs) with inverted structure. The morphological, optical, electrical properties and the surface wettability of c-TiO2 layer were successfully tuned by SAMs modification. The all five SAMs introduced to device configuration improved the photovoltaic performances. The NO2-PBA SAM modified device exhibited a power conversion efficiency (PCE) of 3.4 % with a short-circuit current density of 9.68 mA cm-2, an open-circuit voltage of 0.59 V and fill factor of 48.46 %. More than 50 % enhancement on the PCE was achieved thanks to better ohmic contact and energy level alignment at the interface resulting improved charge collection. The surface properties can be changed by varying the terminal group of molecules, which can control the charge transport properties leading high shunt resistance and low series resistance. Our results showed that the PBA SAMs can be used as efficient interfacial modification layer for inverted OSCs.