Er and Mg co-doped TiO2 nanorod arrays and improvement of photovoltaic property in perovskite solar cell

Chen, Huanhuan; Zhu, Wentao; Zhang, Zhaobin; Cai, Wanxian; Zhou, Xingfu

doi:10.1016/j.jallcom.2018.08.279

Cited by 31 publications

(9 citation statements)

References 54 publications

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Section: Resultsmentioning

confidence: 99%

“…The kink point between ohmic and TFL regimes reflects the onset voltage of the trap-filled limit region, which is represented as V TFL . The value of n trap can be deduced from following equation: ,, where ε 0 (the vacuum permittivity) is 8.854 × 10 –14 F cm –1 , ε is the relative dielectric constant of the perovskite (32 for MAPbI 3 ), e is the elementary charge, and L is the thickness of the perovskite film. According to tests, the V TFL values decreased from 0.58 V for the SnO 2 based device to 0.38 V for the SnO 2 -TPFPB device …”

Section: Resultsmentioning

confidence: 99%

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Interface Modification for Enhanced Efficiency and Stability Perovskite Solar Cells

Wang

Zhuang

et al. 2020

J. Phys. Chem. C

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As a superstars of photovoltaic devices, organic–inorganic hybrid perovskite solar cells (PSCs) have garnered plenty of interest due to their superior character. However, many defects, such as carrier recombination, inferior stability, poor interface contact, have prevented their further development. Here, we demonstrate a novel approach of interface engineering to form a compact perovskite layer with decreased defects on SnO2 film by adding tris(pentafluorophenyl)boron (TPFPB) as an interfacial modification layer, which validly improves the interface performance and enhances the crystallinity of MAPbI3. Hence the planar MAPbI3 PSCs with TPFPB modification show fast charge transfer and low trap state density with an enhanced champion power conversion efficiency (PCE) from the original of 16.92% to 19.41%, as well as long-term stability with 80.7% of its initial PCE after 1000 h of aging in N2 atmosphere without encapsulation, while the pristine one only shows 68.9% of the original PCE. The results reveal that TPFPB can be used as an effective interface modification layer for high efficiency and stability PSCs, and it maybe also be used in other devices due to its superior interface modification for high quality crystallinity thin films.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Interface Modification for Enhanced Efficiency and Stability Perovskite Solar Cells

Wang

Zhuang

et al. 2020

J. Phys. Chem. C

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“…The large resistance of R sh‑2 gives rise to a serious impediment to carrier transport from ligands to the MB electrolyte and further decreases the amount of photogenerated carriers reacting with MB, which may be the reason for their restricted photochemical property (e.g., photocatalytic degradation property). By contrast, EIS spectra of γ-CsPbI 3 NCs fabricated with WS 2 reveal a sloped line in the low-frequency region and a semicircle in the high-frequency region, which is in accordance with the carrier-transfer reaction at the CsPbI 3 |WS 2 interface (shunt resistance R sh‑1 ) and Warburg impedance W s relevant to carriers at the WS 2 |MB electrolyte interface, respectively. − These phenomena indicate that the electrochemical performances are highly related to the interfacial carrier-transfer process and diffusion control. Consistent with the variation in Table S5, it is clear that an efficient charge-transfer process will lead to a small R sh‑1 , and γ-CsPbI 3 NCs and WS 2 form a heterostructure where γ-CsPbI 3 NCs grow in-situ on the surface of WS 2 , which is beneficial for carrier transport.…”

Section: Resultsmentioning

confidence: 91%

Enhanced Photocatalytic Property of γ-CsPbI₃ Perovskite Nanocrystals with WS₂

Zhang

Tai

Zhou

et al. 2019

ACS Sustainable Chem. Eng.

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Black perovskite-phase cesium lead tri-iodide (CsPbI 3 ) has shown great potential in photochemical applications. However, colloidal CsPbI 3 still suffers from the existence of ligands attached to the surface of nanocrystals (NCs) and serious photoluminescence (PL) quenching. Here, we develop two different γ-phase CsPbI 3 (γ-CsPbI 3 ) NCs/ WS 2 heterostructures with two different two-dimensional morphologies of WS 2 (nanoplates and few-layered WS 2 nanosheets) to improve the photocatalytic property of γ-CsPbI 3 NCs. The large surface area and the presence of abundant functional groups on the surface of WS 2 enable a bonding interaction with precursors in the mixture solution, which can reduce the number of ligands and promote the formation and crystal quality of γ-CsPbI 3 NCs. Exhilaratingly, we find that γ-CsPbI 3 NCs fabricated with few-layered WS 2 nanosheets exhibit a significant enhancement in their photocatalytic property, which may result from the increased amount and improved crystal quality of γ-CsPbI 3 NCs and the superior carrier-transport property of few-layered WS 2 nanosheets, and these effects are beneficial for producing abundant hydroxyl radicals to completely degrade methylene blue (MB). The fresh γ-CsPbI 3 NCs/few-layered WS 2 nanosheets show a high photocatalytic degradation efficiency of nearly 100% in 30 min, and completely degrade MB into low-weight and low-toxicity inorganic molecules without any intermediate degradation products.

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“…[ 224–227 ] Those merits will be greatly attractive in enhancing the optical conversion ability and, thus, improve the solar spectrum utilization for high‐efficiency PSCs. For regulating carrier mobility, Chen et al [ 228 ] synthesized Er 3+ and Mg 2+ co‐doped TiO 2 nanorods array as an ETL by a hydrothermal method in PSCs ( Figure a). It was found that the bandgap was changed upward due to the introduction of Er 3+ and Mg 2+ in TiO 2 , which could result in noticeable enhancement of charge transport and injection at the ETL/perovskite interface.…”

Section: Doping Of Semiconductor Oxides Etlsmentioning

confidence: 99%

Section: Doping Of Semiconductor Oxides Etlsmentioning

confidence: 99%

Doping in Semiconductor Oxides‐Based Electron Transport Materials for Perovskite Solar Cells Application

et al. 2021

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From the perspective of the device structure of perovskite solar cells (PSCs), the electron transport layer is one of the essential components and plays a significant role in suppressing carrier recombination. Furthermore, its decisiveness is related to the quality of perovskite film, the rapid interface carrier extraction, and the bandgap alignment. However, the deficiency of the semiconductor oxides based electron transport materials, especially for most studied TiO2, is that their carrier mobility is one to three orders of magnitude lower than the most commonly used hole transport materials, leading to an imbalanced carrier flux and unpredicted hysteresis. Doping new ions are the most effective ways to improve electron mobility and tune the bandgap, while the fundamental mechanism of doping in the majority of cases are still lacking. Herein, the doping effect on semiconductor oxides is reviewed and emphasized by classifying the doping ions according to the critical factors of lattice optimization, a carrier transporting improvement, and interface modification. This review is the first systematic summary of the ion doping characteristics in oxide electron transport layers of PSCs. Finally, the implementation of doping ions in electron transport materials is briefly discussed for further enhancing the photovoltaic performance of PSCs.

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Er and Mg co-doped TiO2 nanorod arrays and improvement of photovoltaic property in perovskite solar cell

Cited by 31 publications

References 54 publications

Interface Modification for Enhanced Efficiency and Stability Perovskite Solar Cells

Interface Modification for Enhanced Efficiency and Stability Perovskite Solar Cells

Enhanced Photocatalytic Property of γ-CsPbI₃ Perovskite Nanocrystals with WS₂

Doping in Semiconductor Oxides‐Based Electron Transport Materials for Perovskite Solar Cells Application

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Er and Mg co-doped TiO2 nanorod arrays and improvement of photovoltaic property in perovskite solar cell

Cited by 31 publications

References 54 publications

Interface Modification for Enhanced Efficiency and Stability Perovskite Solar Cells

Interface Modification for Enhanced Efficiency and Stability Perovskite Solar Cells

Enhanced Photocatalytic Property of γ-CsPbI3 Perovskite Nanocrystals with WS2

Doping in Semiconductor Oxides‐Based Electron Transport Materials for Perovskite Solar Cells Application

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Enhanced Photocatalytic Property of γ-CsPbI₃ Perovskite Nanocrystals with WS₂