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Supersaturation controlled growth of MAFAPbI3 perovskite film for high efficiency solar cells

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Science China Chemistry 2018年第10期61卷 1278-1284页

作者： Dong Liu wenjia zhou Haoying Tang Pengfei Fu Zhijun Ning School of Physical Science and Technology Shanghai Tech University Shanghai 201210 China Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China University of Chinese Academy of Sciences Beijing 100049 China

Controlling the nucleation and growth of organic-inorganic hybrids perovskite is of key importance to improve the morphology and crystallinity of perovskite films. However, the growth mechanism of perovskite films based on classical crystallization theory is not fully understood. Here, we develop a supersaturation controlled strategy(SCS) to balance the nucleation and crystal growth speeds. By this strategy, we are able to find an ideal supersaturation region to realize a balance of nucleation and crystal growth, which yields highly crystallized perovskite films with micrometer-scale grains. Besides, we provide a thoughtful analysis of nucleation and growth based on the fabrication of the perovskite films. As a result, the highest photovoltaic power conversion efficiencies(PCE) of 19.70% and 20.31% are obtained for the planar and the meso-superstructured devices, respectively. This strategy sheds some light for understanding the film growth mechanism of high quality perovskite film, and it provides a facile strategy to fabricate high efficiency perovskite solar cells.

关键词： perovskite solar cell nucleation and growth supersaturation

Novel circular RNA expression profile of uveal melanoma revealed by microarray

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Chinese Journal of Cancer Research 2018年第6期30卷 656-668页

作者： Xuan Yang Yang Li Yueming Liu Xiaolin Xu Yingzhi Wang Yanni Yan wenjia zhou Jingyan Yang Wenbin Wei Beijing Tongren Eye Center Beijing Key Laboratory of Intraocular Tumor Diagnosis and TreatmentBeijing Ophthalmology & Visual Sciences Key LabBeijing Tongren HospitalCapital Medical University Beijing Institute of Ophthalmology Beijing Key Laboratory of Intraocular Tumor Diagnosis and TreatmentBeijing Tongren Eye CenterBeijing Tongren HospitalCapital Medical UniversityBeijing Ophthalmology & Visual Sciences Key Laboratory

Objective: The present study aimed to investigate circular RNA(circRNA) expression in uveal melanoma(UM).Methods: First,we used microarray to compare the expression profiles of circRNA in five UM samples and five normal uvea ***,bioinformatics analyses,including gene ontology(GO) analysis and pathway analysis,were applied to study these differentially expressed circRNAs to predict pathogenic pathways that may be *** real-time polymerase chain reaction(qRT-PCR) in 20 UM samples and 20 normal uvea samples was used to confirm the circRNA expression profiles obtained from the microarray ***,we analyzed the interaction between validated circRNAs and their potential cancer-associated miRNA ***: In total,50,579 circRNAs [fold change(FC) ≥2.0; P<0.05],including 20,654 up-regulated and 29,925 down-regulated circRNAs,were identified as differentially expressed between UM tissues and normal uvea *** used qRT-PCR to verify seven dysregulated circRNAs indicated by the microarray data,including hsacirc0119873,hsacirc0128533,hsacirc0047924,hsacirc0103232,hsa-circRNA10628-6,hsacirc0032148 and hsacirc0133460,which may be promising candidates to study future molecular ***: This study explored,for the first time,the abnormal expression of circRNAs in UM and described the expression profile of circRNAs,providing a new potential target for the mechanism of UM and future treatment of UM.

关键词： Uveal melanoma circular RNA microarray noncoding RNA

High-member low-dimensional Sn-based perovskite solar cells

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Science China Chemistry 2023年第2期66卷 459-465页

作者： Hansheng Li Zihao Zang Qi Wei Xianyuan Jiang Mingyu Ma Zengshan Xing Jingtian Wang Danni Yu Fei Wang wenjia zhou Kam Sing Wong Philip C.Y.Chow Yuanyuan zhou Zhijun Ning School of Physical Science and Technology ShanghaiTech UniversityShanghai201210China Department of Physics Hong Kong University of Science and TechnologyHong Kong999077China Department of Mechanical Engineering The University of Hong KongHong Kong999077China Department of Physics Hong Kong Baptist UniversityHong Kong999077China

Sn-based perovskites are promising thin-film photovoltaic materials for their ideal bandgap and the eco-friendliness of Sn,but the performance of Sn-based perovskite solar cells is hindered by the short carrier diffusion length and large defect density in nominally-synthesized Sn-based perovskite *** we demonstrate that a long carrier diffusion length is achievable in quasi-2D Sn-based perovskite films consisting of high-member low-dimensional Ruddlesden-Popper(RP)phases with a preferred crystal orientation *** key to the film synthesis is the use of a molecular additive formed by phenylethylammonium cations and optimally mixed halide-pseudohalide anions,which favorably tailors the quasi-2D Sn-based perovskite crystallization *** high-member RP film structure effectively enhances device short-circuit current density,giving rise to an increased power conversion efficiency(PCE)of 14.6%.The resulting device demonstrates a near-unity shelf stability upon1,000 h in nitrogen.A high reproductivity is also achieved with a count of 50 devices showing PCEs within a narrow range from minimum 13.0%to maximum 14.6%.

关键词： Sn-based perovskite lead-free perovskite solar cells low-dimensional structure optoelectronics device

Combinations of Hd2 and Hd4 genes determine rice adaptability to Heilongjiang Province, northern limit of China

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Journal of Integrative Plant Biology 2015年第8期57卷 698-707页

作者： Xiufeng Li Huazhao Liu Maoqing Wang Hualong Liu Xiaojie Tian wenjia zhou Tianxiao Lü Zhenyu Wang Chengcai Chu Jun Fang Qingyun Bu Northeast Institute of Geography and Agroecology Key Laboratory of Soybean Molecular Design Breeding the Chinese Academy of Sciences University of Chinese Academy of Sciences Rice Research Institute Heilongjiang Academy of Land Reclamation Sciences Beidahuang Kenfeng Seed Co.Ltd. College of Agriculture Northeast Agricultural University State Key Laboratory of Plant Genomics Institute of Genetics and Developmental Biology Chinese Academy of Sciences

Heading date is a key trait in rice domestication and adaption, and a number of quantitative trait loci（QTLs）have been identified. The rice（Oryza sativa L.） cultivars in the Heilongjiang Province, the northernmost region of China,have to flower extremely early to fulfill their life ***, the critical genes or different gene combinations controlling early flowering in this region have not been determined. QTL and candidate gene analysis revealed that Hd2/Ghd7.1/Os PRR37 plays a major role in controlling rice distribution in Heilongjiang. Further association analysis with a collection of rice cultivars demonstrated that another three major QTL genes（Hd4/Ghd7, Hd5/DTH8/Ghd8, and Hd1）also participate in regulating heading date under natural long day（LD） conditions. Hd2/Ghd7.1/Os PRR37 and Hd4/Ghd7 are two major QTLs and function additively. With the northward rice cultivation, the Hd2/Ghd7.1/Os PRR37 and Hd4/Ghd7 haplotypes became non-functional alleles. Hd1 might be non-functional in most Heilongjiang rice varieties,implying that recessive hd1 were selected during local rice breeding. Non-functional Hd5/DTH8/Ghd8 is very rare, but constitutes a potential target for breeding extremely early flowering cultivars. Our results indicated that diverse genetic combinations of Hd1, Hd2, Hd4, and Hd5 determined the different distribution of rice varieties in this northernmost province of China.

关键词： Rice heading date Hdl Hd2 Hd4 Hd5

High-efficiency breeding of early-maturing rice cultivars via CRISPR/Cas9-mediated genome editing

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Journal of Genetics and Genomics 2017年第3期44卷 175-178页

作者： Xiufeng Li wenjia zhou Yuekun Ren Xiaojie Tian Tianxiao Lv Zhenyu Wang Jun Fang Chengcai Chu Jie Yang Qingyun Bu Northeast Institute of Geography and Agroecology Key Laboratory of Soybean Molecular Design BreedingChinese Academy of SciencesHarbin 150081China Graduate University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Plant Genomics Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China Institute of Food Crops Jiangsu Academy of Agricultural SciencesNanjing 210014China

Rice is a staple food for more than half of the human *** has been estimated that by 2030,40%more rice needs to be produced in order to meet the growing demand（Khush,2005）.One of the strategies to improve rice productivity is to enlarge rice growth areas, such as the northward expansion of the growth region in Heilongjiang Province, the northernmost region of China （Li et al., 2015）. However, the northward cultivation is accompanied with daylength extension and temperature decrease, which are unfavor- able for rice, a tropical short-day plant, to complete flowering and seed setting. Thus, the need for early-maturing rice cultivars with extremely low photoperiod sensitivity is urgent.

关键词： In than High-efficiency breeding of early-maturing rice cultivars via CRISPR/Cas9-mediated genome editing

Surface heterojunction based on n-type low-dimensional perovskite film for highly efficient perovskite tandem solar cells

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National Science Review 2024年第5期11卷 244-253页

作者： Xianyuan Jiang Qilin zhou Yue Lu Hao Liang Wenzhuo Li Qi Wei Mengling Pan Xin Wen Xingzhi Wang Wei zhou Danni Yu Hao Wang Ni Yin Hao Chen Hansheng Li Ting Pan Mingyu Ma Gaoqi Liu wenjia zhou Zhenhuang Su Qi Chen Fengjia Fan Fan Zheng Xingyu Gao Qingqing Ji Zhijun Ning School of Physical Science and Technology Shanghai Tech University Department of Modern Physics University of Science and Technology of China i-Lab CAS Key Laboratory of Nanophotonic Materials and Devices Suzhou Institute of Nano-Tech and Nano-Bionics Shanghai Synchrotron Radiation Facility (SSRF) Shanghai Advanced Research InstituteChinese Academy of Sciences

Enhancing the quality of junctions is crucial for optimizing carrier extraction and suppressing recombination in semiconductor devices. In recent years, metal halide perovskite has emerged as the most promising next-generation material for optoelectronic devices. However, the construction of high-quality perovskite junctions, as well as characterization and understanding of their carrier polarity and density,remains a challenge. In this study, using combined electrical and spectroscopic characterization techniques,we investigate the doping characteristics of perovskite films by remote molecules, which is corroborated by our theoretical simulations indicating Schottky defects consisting of double ions as effective charge *** a post-treatment process involving a combination of biammonium and monoammonium molecules, we create a surface layer of n-type low-dimensional perovskite. This surface layer forms a heterojunction with the underlying 3D perovskite film, resulting in a favorable doping profile that enhances carrier extraction. The fabricated device exhibits an outstanding open-circuit voltage(VOC) up to 1.34 V and achieves a certified efficiency of 19.31% for single-junction wide-bandgap（1.77 eV） perovskite solar cells, together with significantly enhanced operational stability, thanks to the improved separation of carriers. Furthermore, we demonstrate the potential of this wide-bandgap device by achieving a certified efficiency of 27.04% and a VOCof 2.12 V in a perovskite/perovskite tandem solar cell configuration.

关键词： perovskite solar cells field effect transistors heterojunction

Hole-transporting layer-free inverted planar mixed lead-tin perovskite-based solar cells

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Frontiers of Optoelectronics 2017年第2期10卷 103-110页

作者： Yuqin LIAO Xianyuan JIANG wenjia zhou Zhifang SHI Binghan LI Qixi MI Zhijun NING Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China University of Chinese Academy of Sciences Beijing 100049 China

Mixed lead-tin （Pb-Sn） perovskites present a promising strategy to extend the light-harvesting range of perovskite-based solar cells （PSCs）. The use of electron- transporting layer or hole-transporting layer （HTL） is critical to achieve high device efficiency. This strategy, however, requires tedious layer-by-layer fabrication as well as high-temperature annealing for certain oxides. In this work, we fabricated HTL-free planar FAPb0.5Sn0.5I3 PSCs with the highest efficiency of 7.94%. High short- circuit current density of 23.13 mA/cm2 was attained, indicating effective charge extraction at the ITO/ FAPb0.5Sn0.5I3 interface. This finding provides an alter- native strategy to simplify the manufacture of single- junction or tandem PSCs.

关键词： solar cell perovskite hole-transporting layer(HTL) interface engineering

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新西兰国家公园社区共管模式发展经验及启示

世界林业研究 2024年第4期37卷 105-110页

作者：周雯佳陈凯北京林业大学经济管理学院北京100083

在我国国家公园体制建设的背景下,国家公园管理面临着如何平衡自然保护与当地社区权益的复杂挑战。尤其是在少数民族众多的区域,原住民和当地社区的参与不仅关乎到生态保护的成效,也涉及到当地民族和传统文化的保护和传承。新西兰国家... 详细信息

在我国国家公园体制建设的背景下,国家公园管理面临着如何平衡自然保护与当地社区权益的复杂挑战。尤其是在少数民族众多的区域,原住民和当地社区的参与不仅关乎到生态保护的成效,也涉及到当地民族和传统文化的保护和传承。新西兰国家公园的原住民共管机制为探索我国国家公园的社区管理制度提供了一个独特的参考。文中将新西兰国家公园社区共管模式的发展过程分为3个阶段,从法律框架保障、多方协同组织和社区参与机制3个方面总结其社区共管的发展经验,并结合中国国情和地方特色提出了对我国国家公园社区共管实践的建议。

关键词：国家公园社区共管社区参与可持续管理新西兰

老年人对情绪性事件的情景模拟:回忆过去与想象未来

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心理发展与教育 2018年第3期34卷 304-313页

作者：周文佳苏曼周楚复旦大学心理学系上海200433

研究采用自传体访谈技术,首次考察了老年人在对情绪性事件进行回忆和想象中生成的内部细节和外部细节数量,及其对回忆和想象内容的主观评估。结果发现:(1)无论是回忆还是想象任务,老年人都比年轻人提供了更少的内部细节和略多的外部细节... 详细信息

研究采用自传体访谈技术,首次考察了老年人在对情绪性事件进行回忆和想象中生成的内部细节和外部细节数量,及其对回忆和想象内容的主观评估。结果发现:(1)无论是回忆还是想象任务,老年人都比年轻人提供了更少的内部细节和略多的外部细节;(2)与年轻人相似,老年人在想象未来积极事件时产生了更多的内部细节,表现出对积极信息的加工偏好;(3)老年人比年轻人更倾向于认为想象的事件与过去发生的事件相似度高,表明该群体在想象过程中更多地依赖了过去的记忆。该结果揭示了老年人对情绪性事件的回忆和想象特点,说明在回忆和想象过程中出现的与年龄有关的缺陷同样会体现在情绪性事件中,这很好地支持了建构性情景模拟假说。

关键词：老化未来情景思考情绪自传体访谈