Interface engineering in planar perovskite solar cells: energy level alignment, perovskite morphology control and high performance achievement

Yang, Guang; Wang, Changlei; Lei, Hongwei; Zheng, Xiaolu; Qin, Pingli; Xiong, Lixia; Zhao, Xingzhong; Yan, Yanfa; Fang, Guojia

doi:10.1039/c6ta08783c

Cited by 388 publications

(287 citation statements)

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“…[15,16] The strong coupling between TiO 2 and the adsorbate may lead to strongly increased light absorption but may also result in a large amount of charge recombination through BET, which can have a negative impact on photocatalytic applications. [18] In addition, the employment of the APTES linker can also be helpful for the effective attachment of the GQD by forming amide groups from the amine groups of APTES and the carboxyl groups of the GQD. [18] In addition, the employment of the APTES linker can also be helpful for the effective attachment of the GQD by forming amide groups from the amine groups of APTES and the carboxyl groups of the GQD.…”

Section: D Tio 2 /Aptes/gqd Heterostructurementioning

confidence: 99%

Highly Efficient UV–Visible Photocatalyst from Monolithic 3D Titania/Graphene Quantum Dot Heterostructure Linked by Aminosilane

Yoon

Lee

Kim

et al. 2019

Advanced Sustainable Systems

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without self-degradation. [3] Despite its high photocatalytic reactivity, limitations such as the presence of few active sites in the thinfilm form, limited use of the solar spectrum due to its wide bandgap (3.2 eV for anatase), and relatively inefficient charge separation have hampered the entry of TiO 2 into real applications. [4] So far, various approaches to increase its reaction sites by increasing the specific surface area, [5] to reduce the bandgap through hetero-atom doping, [5d,6] and to retard charge recombination by inducing charge separation or spin-orbit coupling using transition metal have been carried out to improve the photocatalytic efficiency of TiO 2 . [7] Numerous synthetic strategies for these approaches have been well-established and developed in their respective areas, but the overall effect is tempered when the catalyst design only addresses one of these limitations. Therefore, it is essential to develop a rational design that can simultaneously overcome all of the limitations to further enhance the TiO 2 photocatalyst efficiency.Recently, our group has reported the fabrication of N-doped 3D nanostructured TiO 2 in monolithic form by utilizing proximity-field nanopatterning (PnP) and atomic layer deposition (ALD) methods, demonstrating the enhanced photocatalytic activity of the material under visible irradiation, which is produced by the improved surface area and reduced bandgap (2.75 eV), along with great reusability without any recollection process. [5a,d] The N-doping of the periodically nanostructured TiO 2 is carried out through a simple thermal annealing and enables the 3D TiO 2 to take visible light-driven activity, which is difficult to obtain by the nanostructuring effect alone. However, the doping method, known as the most common method of increasing the visible absorption of TiO 2 , inevitably provides intermediate states within the TiO 2 bandgap. These additional states are likely to serve as recombination sites for the photogenerated electron-hole (e-h) pairs. [6b,8] As the recombination sites of e-h pairs adversely affect the charge separation, minimizing the charge recombination is also necessary to enhance the photocatalytic activity.To enhance the visible light activity of TiO 2 without generating intermediate states from the doping, heterostructuring As rapidly growing environmental pollution demands the development of efficient photocatalytic materials, tremendous attention has been drawn to TiO 2 , a widely used photocatalytic material with cost-effectiveness, stability, and outstanding reactivity. To maximize its photocatalytic efficiency by enhancing the photogenerated charge separation, lowering the intrinsically large bandgap (3.2 eV) of TiO 2 is a key problem to be overcome. Herein, a new design is reported for an efficient photocatalyst realized by heterostructuring a 3D nanostructured TiO 2 monolith (3D TiO 2 ) and graphene quantum dots (GQDs) through using 3-aminopropyltriethoxysilane (APTES) as a linker. The incorporation of APTES between the TiO 2 /GQD i...

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Section: D Tio 2 /Aptes/gqd Heterostructurementioning

confidence: 99%

Highly Efficient UV–Visible Photocatalyst from Monolithic 3D Titania/Graphene Quantum Dot Heterostructure Linked by Aminosilane

Yoon

Lee

Kim

et al. 2019

Advanced Sustainable Systems

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“…The surface treatments of ETL, HTL, and the perovskite absorber layer by light metals and carbonaceous materials doping have shown a positive impact in the mitigation of hysteresis behavior [12][13][14][15][16][17][18]. Most studies consider only ionic movement as the phenomenon responsible for J-V hysteresis.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Kinetics of Efficient Perovskite Solar Cells

et al. 2017

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Perovskite solar cells (PSCs) have immense potential for high power conversion efficiency with an ease of fabrication procedure. The fundamental understanding of interfacial kinetics in PSCs is crucial for further improving of their photovoltaic performance. Herein we use the current-voltage (J-V) characteristics and impedance spectroscopy (IS) measurements to probe the interfacial kinetics on efficient MAPbI 3 solar cells. We show that series resistance (R S ) of PSCs exhibits an ohmic and non-ohmic behavior that causes a significant voltage drop across it. The Nyquist spectra as a function of applied bias reveal the characteristic features of ion motion and accumulation that is mainly associated with the MA cations in MAPbI 3 . With these findings, we provide an efficient way to understand the working mechanism of perovskite solar cells.

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“…[6] When light is absorbedb yt he perovskite layer in solar cells, photoinduced carriers diffuse towards the contact layer spontaneously and the formed charge-depleted region makes the charge transport across the interface happent hrough equalizing the Fermi energy level. [9][10][11] These approaches improvet he perovskite film quality,r educe the hysteresis behavior,a nd enhancet he overall efficiency through facilitating carrier transport at the electron transport layer (ETL)/perovskite interface and passivating the perovskite layer.O ne of the main challenges for scaled-up productiono fp erovskite solar cells is the device stability:t his issue can be addressed by interfacial engineering. [7] Also, ion migration and accumulation at the external interface is thought to be responsible for the observed hysteresis behaviors.…”

Section: Introductionmentioning

confidence: 99%

“…Although complicated organic molecules [10,15] were employed to realize rapid charget ransfer at the interface and suppress hysteresis, potentiald efects in the interconnections among organicm olecules limit the effectiveness of the interfacial trap passivation, [14] which is unfavorable for photovoltaic device performance or stabilityi na mbient environment. Inorganic sulfur functionalization on the SnO 2 ETL was introduced through xanthate decomposition at low temperature to modify the SnO 2 /perovskite interface to anchor Pb 2 + in perovskite and SnO 2 simultaneously, leading to improved charge transport as ar esult of chemical interactions at the SnO 2 /perovskite junction.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Sulfur Functionalization Anchoring SnO₂ and CH₃NH₃PbI₃ for Enhanced Stability and Trap Passivation in Perovskite Solar Cells

et al. 2018

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Trap states at the interface or in bulk perovskite materials critically influence perovskite solar cells performance and long-term stability. Here, a strategy for efficiently passivating charge traps and mitigating interfacial recombination by SnO surface sulfur functionalization is reported, which utilizes xanthate decomposition on the SnO surface at low temperature. The results show that functionalized sulfur atoms can coordinate with under-coordinated Pb ions near the interface. After device fabrication under more than 60 % humidity in ambient air, the efficiency of methylammonium lead iodide (MAPbI ) perovskite solar cells based on sulfur-functionalized SnO increased from 16.56 % to 18.41 % with suppressed hysteresis, which resulted from the accelerated interfacial charge transport kinetics and decreased traps in bulk perovskite by interfacial sulfur functionalization. Additionally, thermally stimulated current studies show the decreased trap density in the shallow trap area after interfacial sulfur functionalization. The interfacial sulfur functionalized solar cells without sealing also exhibited considerable retardation of solar cell degradation with only 10 % degradation after 70 days air storage. This work demonstrates a facile sulfur functionalization strategy by using xanthate decomposition on SnO surfaces to obtain highly efficient perovskite solar cells.

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Interface engineering in planar perovskite solar cells: energy level alignment, perovskite morphology control and high performance achievement

Abstract: APTES-SAM as an efficient interfacial layer in planar perovskite solar cells, optimizing the interface and enhancing performance.

Cited by 388 publications

References 50 publications

Highly Efficient UV–Visible Photocatalyst from Monolithic 3D Titania/Graphene Quantum Dot Heterostructure Linked by Aminosilane

Highly Efficient UV–Visible Photocatalyst from Monolithic 3D Titania/Graphene Quantum Dot Heterostructure Linked by Aminosilane

Interfacial Kinetics of Efficient Perovskite Solar Cells

Interfacial Sulfur Functionalization Anchoring SnO₂ and CH₃NH₃PbI₃ for Enhanced Stability and Trap Passivation in Perovskite Solar Cells

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Interface engineering in planar perovskite solar cells: energy level alignment, perovskite morphology control and high performance achievement

Abstract: APTES-SAM as an efficient interfacial layer in planar perovskite solar cells, optimizing the interface and enhancing performance.

Cited by 388 publications

References 50 publications

Highly Efficient UV–Visible Photocatalyst from Monolithic 3D Titania/Graphene Quantum Dot Heterostructure Linked by Aminosilane

Highly Efficient UV–Visible Photocatalyst from Monolithic 3D Titania/Graphene Quantum Dot Heterostructure Linked by Aminosilane

Interfacial Kinetics of Efficient Perovskite Solar Cells

Interfacial Sulfur Functionalization Anchoring SnO2 and CH3NH3PbI3 for Enhanced Stability and Trap Passivation in Perovskite Solar Cells

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Interfacial Sulfur Functionalization Anchoring SnO₂ and CH₃NH₃PbI₃ for Enhanced Stability and Trap Passivation in Perovskite Solar Cells