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Journal of Semiconductors 2017年第1期38卷 54-59页

作者： Dong Wang Yue Chang Shuping Pang Guanglei Cui Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101China

The fast developing perovskite solar cells shows high efficiency and low ***,the stability problem restricts perovskite from commercial *** this work,we have studied the effect of grain orientation on the morphological stability of perovskite thin *** tuning the inorganic/organic ratio in the precursor solution,perovskite thin films with both high crystallinity and good morphological stability have been *** thermal stability of perovskite solar cells based on the optimized films has been *** device performance shows no degradation after annealing at 100℃ for 5h in *** finding provides general guidelines for the development of thermally stable perovskite solar cells.

关键词： perovskite solar cells morphological stability grain orientation

Enhancement of morphological and emission stability of deep-blue small molecular emitter via a universal side-chain coupling strategy for optoelectronic device

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Chinese Chemical Letters 2022年第2期33卷 835-841页

作者： Ning Sun Han Gao Lili Sun Jingxi An Man Xu Chen Sun Yamin Han Jinyi Lin Jiangli Cai Mingjian Ni Liangliang He Jinghao Yang Zhoulu Wang Lubing Bai Xinwen Zhang Qi Wei Xuehua Ding Chengrong Yin Linghai Xie Wei Huang Key Laboratory of Flexible Electronics(KLOFE)and Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing 210000China State Key Laboratory of Organic Electronics and Information Displays and Institute of Advanced Materials(IAM) Nanjing University of Posts and TelecommunicationsNanjing 210023China Frontiers Science Center for Flexible Electronics(FSCFE) MIIT Key Laboratory of Flexible Electronics(KLoFE)Northwestern Polytechnical UniversityXi’an 710072China

Film morphology of emissive layers is crucial to the performance and stability of solution-processable organic light-emitting diodes(OLEDs). Compared to the interpenetration of conjugated polymer chain,small molecular emitter with a flexible side chain always presents easily aggregation upon external treatment, and caused π-electronic coupling, which is undesirable for the efficiency and stability of deep-blue OLEDs. Herein, we proposed a side-chain coupling strategy to enhance the film morphological an emission stability of solution-processable small molecular deep-blue emitter. In contrary to “parent” MC8 TPA,the crosslinkable styryl and vinyl units were introduced as ended unit at the side-chain of Cm TPA and OEYTPA. Interestingly, Cm TPA and OEYTPA films present a relatively stable morphology and uniform deep-blue emission after thermal annealing(160 ℃) in the atmosphere, different to the discontinuous MC8 TPA annealed film. Besides, compared to the Cm TPA and OEYTPA ones, serious polaron formation in the MC8 TPA annealed film also negative to the deep-blue emission, according to transient absorption analysis. Therefore, both Cm TPA and OEYTPA annealed film obtained at 140 ℃ present an excellent deep-blue ASE behavior with a 445 nm, but absence for MC8 TPA ones, associated with the disruption of annealed films. Finally, enhancement of device performance based on Cm TPA and OEYTPA film(~40%)after thermal annealing with a similar performance curves also confirmed the assumption above. Therefore, these results also supported the effectiveness of our side-chain coupling strategy for optoelectronic applications.

关键词： Side-chain coupling Small molecular emitter morphological stability Deep-blue emission Optoelectronic device

Tip-splitting instability in directional solidification based on bias field method

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Chinese Physics B 2015年第7期24卷 548-553页

作者：游家学王志军李俊杰王锦程 State Key Laboratory of Solidification Processing Northwestern Polytechnical University

Tip splitting instability of cellular interface morphology in directional solidification is analyzed based on the bias field method proposed recently by Glicksman. The physical mechanism of tip instability is explained by analyzing the interface potential, the tangential energy flux, and the normal energy flux. A rigorous criterion for tip-splitting instability is established analytically, i.e., the ratio of the cellular tip radius to the cellular width α 〉3/2/π≈ 0.3899, which is in good agreement with simulation results. This study also reveals that the cellular tip splitting instability is attributable to weak Gibbs–Thomson energy acting on the interface.

关键词： directional solidification morphological stability tip-splitting analytical method

Universal 4-qualifiable fluorene-based building blocks for potential optoelectronic applications

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Chinese Chemical Letters 2022年第12期33卷 5137-5141页

作者： Xiang An Jinghao Yang Man Xu Lili Sun Lubing Bai Kai Wang Zhiqiang Zhuo Yingying Zheng Jinyi Lin Xuehua Ding Yuyu Liu Linghai Xie Chengrong Yin Wei Huang Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing 211816China State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM) Nanjing University of Posts&TelecommunicationsNanjing 210023China Frontiers Science Center for Flexible Electronics(FSCFE) MIIT Key Laboratory of Flexible Electronics(KLoFE)Northwestern Polytechnical UniversityXi'an 710072China Electrical Engineering College Nanjing Vocational University of Industry TechnologyNanjing 210023China

In the design of conjugated molecules,modular production enables materials to easily realize structure modification and precisely tune their photoelectrical *** of a novel and universal building block is crucial to design and manufacture high performance and stable conjugated molecules for optoelectronic ***,we originally demonstrated a universal 4-qualifiable fluorene-based building block,which is a fundamental molecular segment to functionalize and obtain novel conjugated *** to the traditional modification at 9-site,additional 4-position functionalization provided an exciting blueprint to not only tune electronic structure and excited state via p-n molecular design engineering and space charge-transfer strategy,but also allow for optimizing intermolecular arrangement and obtaining solution-processing *** introduction of the 4-site substituent in fluorene based semiconductors may endow materials with unique ***,we successfully prepared two stable deep-blue light-emitting conjugated polymer,PODOPF and PODOF,by utilizing the 4-substituent fluorene based building *** is believable that the performance,stability and processibility of reported outstanding fluorene-based conjugated molecules can be further optimized based on this universal building block.

关键词： Side-chain coupling Small molecular emitter morphological stability Deep-blue emission Optoelectronic device

On Sustainable Production of CaCO3 via Monohydrocalcite—A Carbon Capture and Mineralisation Product from Waste Brines

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Green and Sustainable Chemistry 2023年第1期13卷 34-61页

作者： Roneta Chaliulina Gulf Organisation for Research and Development Doha Qatar

This study investigated the conversion of monohydrocalcite (MHC) to anhydrous calcium carbonate. The primary material, MHC, was produced from waste brines containing Ca and Mg ions, reacted with sodium carbonate, which may serve in the carbon capture and mineralisation approach. Two different approaches to the conversion were studied: 1) the conversion of MHC conversion to anhydrous calcium carbonates in air (under ambient conditions);2) the identification of conversion conditions which could be adapted for potential industrial application. The former focused on the effects of the synthesis system conditions of the primary material on the aragonite conversion process and the resulting aragonite morphology, whereas the latter covered the factors that accelerate conversion and influence the resulting morphology. The paper also discusses instances where MHC converts to the more stable polymorph, calcite. It was found that conditions leading to the polymorphic and morphological selection of converted minerals were temperature and humidity dependant.

关键词： Morphology morphological stability Calcium Carbonates Minerals Salts