Europium and terbium lanthanide ions co-doping in TiO2 photoanode to synchronously improve light-harvesting and open-circuit voltage for high-efficiency dye-sensitized solar cells

Akman, Erdi; Akın, Seçkin; Öztürk, Teoman; Gülveren, Berna; Sönmezoğlu, Savaş

doi:10.1016/j.solener.2020.03.108

Cited by 40 publications

(23 citation statements)

References 60 publications

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“…It is noteworthy that values of our parameters determined for the devices assembled with different photoanodes are in good agreement with those given in the literature. 18,46,47 Devices with TT, NT, TN and NN photoanodes exhibit average PCEs of 4.38 ± 0.07, 4.35 ± 0.1, 6.04 ± 0.06 and 4.08 ± 0.04 with V oc values of 0.585, 0.639, 0.627 and 0.586 V, respectively. Trends in V oc values mainly follow expectations anticipated by examination of MS analysis giving energy differences between flat-band potential.…”

Section: Resultsmentioning

confidence: 99%

Ni‐doped TiO ₂ / TiO ₂ homojunction photoanodes for efficient dye‐sensitized solar cells

Atılgan

Yildiz

2022

Intl J of Energy Research

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The development of novel bilayer photoanodes plays an essential role in dyesensitized solar cell (DSSC) applications to fabricate efficient devices. Herein, a novel homojunction photoanode consisting of undoped and Ni-doped TiO 2 layers with trace amounts of Ni dopant (0.5% at.) was prepared. After a systematic study on photoconversion efficiency that changes with tuning the location of the doped layer, an in-depth understanding was obtained regarding the physical mechanism of the coupling of structural, optical and electrical properties. We demonstrated that the doped layer can be utilized for highperformance DSSCs by employing a homojunction photoanode consisting of an upper-layer of Ni-doped TiO 2 and a lower-layer of undoped TiO 2 to dramatically increase the photoconversion efficiency. We monitored that the light absorption ability of the dye-loaded photoanodes strongly improved with the bilayer (Ni-doped TiO 2 /TiO 2 ), leading to a higher short circuit current. From impedance spectroscopy (Mott-Schottky plots), compared to both undoped and the doped single-layer analogues, a greater shift to more negative flat band potential was noticed for the bilayer and, therefore, a higher open-circuit voltage was achieved. From electrochemical impedance spectroscopy analysis, it was found that chemical capacitance decreases, while recombination resistance increases after Ni incorporation in the photoanode. They were associated with a reduction in the number of immobile electrons trapped by defect states. A relatively longer electron lifetime of 10.18 ms and diffusion length of 63.2 μ m were obtained for the device assembled with the homojunction (Ni-doped TiO 2 /TiO 2 ). The PCE (6.08%) of the device assembled with the bilayer was superior to its single-layer analogue (4.13%), owing to its enhanced light harvesting capability, proper band alignment, improved injection ability, fast electron transport and better collection efficiency. Our results shed light on important characteristics of a homojunction photoanode, which can be considered for future studies and applications.

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Section: Resultsmentioning

confidence: 99%

Ni‐doped TiO ₂ / TiO ₂ homojunction photoanodes for efficient dye‐sensitized solar cells

Atılgan

Yildiz

2022

Intl J of Energy Research

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“…It can be seen that the V oc of the S 3 (0.66 V) was higher than that obtained from the S 2 (0.64 V). The V oc is determined by the chemical potential of the electrolyte and the Fermi level of the semiconductor oxide [37]. As seen in Scheme 2a, the S 3 showed a more negative E fb value, so the difference between the Fermi level of S 3 and the redox potential of I − /I 3 − would be larger, and the corresponding V oc will be higher.…”

Section: Structure Characterizationmentioning

confidence: 99%

In Situ Decoration of ZnSnO3 Nanosheets on the Surface of Hollow Zn2SnO4 Octahedrons for Enhanced Solar Energy Application

Liu

Sun

et al. 2022

Nanomaterials

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Hierarchical ZnSnO3/Zn2SnO4 porous hollow octahedrons were constructed using the method of combining the acid etching process with the in situ decoration technique for photovoltaic and photocatalytic applications. The composite was used as photoanode of the dye-sensitized solar cells (DSSCs), an overall 4.31% photovoltaic conversion efficiency was obtained, nearly a 73.1% improvement over the DSSCs that used Zn2SnO4 solid octahedrons. The composite was also determined to be a high-performance photocatalyst for the removal of heavy metal ion Cr (VI) and antibiotic ciprofloxacin (CIP) in single and co-existing systems under simulated sunlight irradiation. It was remarkable that the composite displayed good reusability and stability in a co-existing system, and the simultaneous removal performance could be restored by a simple acid treatment. These improvements of solar energy utilization were ascribed to the synergetic effect of the hierarchical porous hollow morphology, the introduction of ZnSnO3 nanosheets, and the heterojunction formed between ZnSnO3 and Zn2SnO4, which could improve light harvesting capacity, expedite electron transport and charge-separation efficiencies.

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“…The electrochemical stability of the MoS 2 /FTO CE should provide long-term stability for solar cell devices. However, more work needs to be done to improve the efficiency of this DSSC device [36][37][38][39].…”

Section: Dssc Performancementioning

confidence: 99%

Influence of thickness and morphology of MoS₂on the performance of counter electrodes in dye-sensitized solar cells

Thi¹,

Le²,

Nguyen³

et al. 2022

Beilstein J. Nanotechnol.

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Non-platinum electrodes for photoelectric devices are challenging and attractive to the scientific community. A thin film of molybdenum disulfide (MoS2) was prepared on substrates coated with fluorine-doped tin oxide (FTO) to substitute the platinum counter electrode (CE) for dye-sensitized solar cells (DSSCs). Herein, we synthesized layered and honeycomb-like MoS2 thin films via the cyclic voltammetry (CV) route. Thickness and morphology of the MoS2 thin films were controlled via the concentration of precursor solution. The obtained results showed that MoS2 thin films formed at a low precursor concentration had a layered morphology while a honeycomb-like MoS2 thin film was formed at a high precursor concentration. Both types of MoS2 thin film were composed of 1T and 2H structures and exhibited excellent electrocatalytic activity for the I3–/I− redox couple. DSSCs assembled using these MoS2 CEs showed a maximal power conversion efficiency of 7.33%. The short-circuit value reached 16.3 mA·cm−2, which was higher than that of a conventional Pt/FTO CE (15.3 mA·cm−2). This work reports for the first time the possibility to obtain a honeycomb-like MoS2 thin film morphology by the CV method and investigates the effect of film structure on the electrocatalytic activity and photovoltaic performance of CEs for DSSC application.

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Europium and terbium lanthanide ions co-doping in TiO2 photoanode to synchronously improve light-harvesting and open-circuit voltage for high-efficiency dye-sensitized solar cells

Cited by 40 publications

References 60 publications

Ni‐doped TiO ₂ / TiO ₂ homojunction photoanodes for efficient dye‐sensitized solar cells

Ni‐doped TiO ₂ / TiO ₂ homojunction photoanodes for efficient dye‐sensitized solar cells

In Situ Decoration of ZnSnO3 Nanosheets on the Surface of Hollow Zn2SnO4 Octahedrons for Enhanced Solar Energy Application

Influence of thickness and morphology of MoS₂on the performance of counter electrodes in dye-sensitized solar cells

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Europium and terbium lanthanide ions co-doping in TiO2 photoanode to synchronously improve light-harvesting and open-circuit voltage for high-efficiency dye-sensitized solar cells

Cited by 40 publications

References 60 publications

Ni‐doped TiO 2 / TiO 2 homojunction photoanodes for efficient dye‐sensitized solar cells

Ni‐doped TiO 2 / TiO 2 homojunction photoanodes for efficient dye‐sensitized solar cells

In Situ Decoration of ZnSnO3 Nanosheets on the Surface of Hollow Zn2SnO4 Octahedrons for Enhanced Solar Energy Application

Influence of thickness and morphology of MoS2on the performance of counter electrodes in dye-sensitized solar cells

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Ni‐doped TiO ₂ / TiO ₂ homojunction photoanodes for efficient dye‐sensitized solar cells

Ni‐doped TiO ₂ / TiO ₂ homojunction photoanodes for efficient dye‐sensitized solar cells

Influence of thickness and morphology of MoS₂on the performance of counter electrodes in dye-sensitized solar cells