The structure and the potential energy function of AlSO(CS,X2A″)

Yang, Zhenqing; Qing-He, Gao; Li, Jin; Rong-Feng, Linghu; Guo, Yixin; Cheng, Xinlu; Zheng-He, Zhu; Yang, Xinling

doi:10.1088/1674-1056/20/5/053102

Cited by 24 publications

(25 citation statements)

References 17 publications

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“…For the samples of perovskite/PDT-T (τ = 65.92) and perovskite/PDTT-T (τ = 53.99), the shortened TRPL decay indicates a faster electron-transfer process and more efficient hole extraction from the perovskite into HTM. 55 PDTT-T accelerates charge transport more obviously, which agrees well with the trend in PL spectra.…”

Section: ■ Results and Discussionsupporting

confidence: 85%

Donor–Acceptor Type Polymers Containing Fused-Ring Units as Dopant-Free, Hole-Transporting Materials for High-Performance Perovskite Solar Cells

Wang

Zhuang

You

et al. 2020

ACS Appl. Energy Mater.

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Hole-transporting layer (HTL) plays a key role in most high-efficiency perovskite solar cells (PVSCs). Especially in the n-i-p conventional PVSCs, HTL promotes device performances through multiple ways, including hole injection and transport, interface optimization, inhibition of charges recombination, and protection of the perovskite active layer from oxygen, water, and metal electrode. Although spirobased small-molecular hole-transporting materials (HTMs) brought PCE records of PVSCs one by one, the poor film quality and requirement of additives brought some negative effects on the long-term stability of the devices. Therefore, dopant-free, compact polymeric HTLs attract intensive attention as potential alternatives to doped spiro-based ones. Among polymeric HTMs, electron donor (D)−acceptor (A)-type polymers become promising HTMs owing to the superior hole-transporting properties. In this work, two D−A polymers containing fused rings perform as dopant-free HTMs. The fused-ring ladder-type units can facilitate carrier transport, electron donation, and π−π stacking interactions. Polymers PDT-T and PDTT-T employ the same A unit of BDD and π-bridge of thiophene and different D units of IDT and IDTT. Both polymers exhibit favorable properties as HTMs including high hole mobility, well-matched energy levels, and excellent film-formation ability. Along with a peak PCE of 19.02%, the superior device stabilities of the PVSCs employing dopant-free PDT-T and PDTT-T over the reference devices confirm the significance of precise molecular design on fused-ring polymeric HTMs for the long-life PVSCs.

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Section: ■ Results and Discussionsupporting

confidence: 85%

Donor–Acceptor Type Polymers Containing Fused-Ring Units as Dopant-Free, Hole-Transporting Materials for High-Performance Perovskite Solar Cells

Wang

Zhuang

You

et al. 2020

ACS Appl. Energy Mater.

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“…All TiO 2 /FTO/glass and Nb-doped TiO 2 /FTO/glass substrates were treated by UV-ozone treatment for 15 min before deposition of the perovskite films. The perovskite solution containing 1 mmol of PbI 2 (99.99%, Alfar Aesar), 1 mmol of CH 3 NH 3 I (synthesized according to our earlier work 4,17,18 ), and 1 mmol of dimethyl sulfoxide (DMSO, 99.9%, Aldrich) was dissolved in 600 mg of N,N-dimethylformamide (DMF, 99.8%, Alfa Aesar). The mixed solution was spin-coated on top of the ETLs (TiO 2 and Nbdoped TiO 2 ) at 1000 rpm for 5 s and 4000 rpm for 45 s while dripping chlorobenzene onto the substrate during the second spinning step.…”

Section: Methodsmentioning

confidence: 99%

Enhancing Efficiency and Stability of Perovskite Solar Cells through Nb-Doping of TiO₂ at Low Temperature

Yin¹,

Jiang

et al. 2017

ACS Appl. Mater. Interfaces

189

121

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The conduction band energy, conductivity, mobility, and electronic trap states of electron transport layer (ETL) are very important to the efficiency and stability of a planar perovskite solar cell (PSC). However, as the most widely used ETL, TiO often needs to be prepared under high temperature and has unfavorable electrical properties such as low conductivity and high electronic trap states. Modifications such as elemental doping are effective methods for improving the electrical properties of TiO and the performance of PSCs. In this study, Nb-doped TiO films are prepared by a facile one-port chemical bath process at low temperature (70 °C) and applied as a high quality ETL for planar PSCs. Compared with pure TiO, the Nb-doped TiO is more efficient for photogenerated electron injection and extraction, showing higher conductivity, higher mobility, and lower trap-state density. A PSC with 1% Nb-doped TiO yielded a power conversion efficiency of more than 19%, with about 90% of its initial efficiency remaining after storing for 1200 h in air or annealing at 80 °C for 20 h in a glovebox.

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“…Recent experimental and computational studies suggested the existence of ordered phase of polymers near graphitic surfaces, known as the interphase we introduce earlier. [ 27,28 ] Although the high crystallinity of this polymer interface limits the density of chemical cross-links, the ordered structures allow cooperative physical cross-links between them and thus are stiffened compared to the uncross-linked polymers. The results from our simulations with a 5 nm polymer deposition clearly demonstrate the ordering near graphitic surface.…”

Section: Molecular Mechanisms Of the Self-stiffening Effectmentioning

confidence: 99%

Interphase Induced Dynamic Self‐Stiffening in Graphene‐Based Polydimethylsiloxane Nanocomposites

Cao

Wang

Dong

et al. 2016

Small

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The ability to rearrange microstructures and self-stiffen in response to dynamic external mechanical stimuli is critical for biological tissues to adapt to the environment. While for most synthetic materials, subjecting to repeated mechanical stress lower than their yield point would lead to structural failure. Here, it is reported that the graphene-based polydimethylsiloxane (PDMS) nanocomposite, a chemically and physically cross-linked system, exhibits an increase in the storage modulus under low-frequency, low-amplitude dynamic compressive loading. Cross-linking density statistics and molecular dynamics calculations show that the dynamic self-stiffening could be attributed to the increase in physical cross-linking density, resulted from the re-alignment and re-orientation of polymer chains along the surface of nano-fillers that constitute an interphase. Consequently, the interfacial interaction between PDMS-nano-fillers and the mobility of polymer chain, which depend on the degree of chemical cross-linking and temperature, are important factors defining the observed performance of self-stiffening. The understanding of the dynamic self-stiffening mechanism lays the ground for the future development of adaptive structural materials and bio-compatible, load-bearing materials for tissue engineering applications.

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The structure and the potential energy function of AlSO(C_S,X²A″)

Abstract: Yang Ze-Jin(杨则金) a) † , Gao Qing-He(高清河) b) , Li Jin(李劲) c) , Linghu Rong-Feng(令狐荣锋) d) , Guo Yun-Dong(郭云东) e) , Cheng Xin-Lu(程新路) f) , Zhu Zheng-He(朱正和) f) , and Yang Xiang-Dong(杨向东) f)

Cited by 24 publications

References 17 publications

Donor–Acceptor Type Polymers Containing Fused-Ring Units as Dopant-Free, Hole-Transporting Materials for High-Performance Perovskite Solar Cells

Donor–Acceptor Type Polymers Containing Fused-Ring Units as Dopant-Free, Hole-Transporting Materials for High-Performance Perovskite Solar Cells

Enhancing Efficiency and Stability of Perovskite Solar Cells through Nb-Doping of TiO₂ at Low Temperature

Interphase Induced Dynamic Self‐Stiffening in Graphene‐Based Polydimethylsiloxane Nanocomposites

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The structure and the potential energy function of AlSO(CS,X2A″)

Abstract: Yang Ze-Jin(杨则金) a) † , Gao Qing-He(高清河) b) , Li Jin(李 劲) c) , Linghu Rong-Feng(令狐荣锋) d) , Guo Yun-Dong(郭云东) e) , Cheng Xin-Lu(程新路) f) , Zhu Zheng-He(朱正和) f) , and Yang Xiang-Dong(杨向东) f)

Cited by 24 publications

References 17 publications

Donor–Acceptor Type Polymers Containing Fused-Ring Units as Dopant-Free, Hole-Transporting Materials for High-Performance Perovskite Solar Cells

Donor–Acceptor Type Polymers Containing Fused-Ring Units as Dopant-Free, Hole-Transporting Materials for High-Performance Perovskite Solar Cells

Enhancing Efficiency and Stability of Perovskite Solar Cells through Nb-Doping of TiO2 at Low Temperature

Interphase Induced Dynamic Self‐Stiffening in Graphene‐Based Polydimethylsiloxane Nanocomposites

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About

The structure and the potential energy function of AlSO(C_S,X²A″)

Abstract: Yang Ze-Jin(杨则金) a) † , Gao Qing-He(高清河) b) , Li Jin(李劲) c) , Linghu Rong-Feng(令狐荣锋) d) , Guo Yun-Dong(郭云东) e) , Cheng Xin-Lu(程新路) f) , Zhu Zheng-He(朱正和) f) , and Yang Xiang-Dong(杨向东) f)

Enhancing Efficiency and Stability of Perovskite Solar Cells through Nb-Doping of TiO₂ at Low Temperature